When does your Heating usually go on?
 

My heating went on at the beginning of October for about 20mins a day first thing in the morning when I'm not at work.

Since getting my new boiler installed back in May my radiators all get red hot in 10mins, previously it would take nearly an hour to get fairly warm, so I'm hoping my bills will drop a bit this year seeing my old boiler was basically not operating very well.

Re: When does your Heating usually go on?
 

Mine went on constant in September. My thermostat is set between 15-16. I have double radiators everywhere and a 10 year old combi boiler. My home stays warm. I can't do 20 on the thermostat. I can't breathe. Boiler temp is set to 60.

Re: When does your Heating usually go on?
 

This time of year, usually on between 6am and 9am, then back on about 5pm until 8pm. (depending on outside temps)

Things will change as the weather does

Re: When does your Heating usually go on?
 

I only turn my heating on if my nose turns blue

Re: When does your Heating usually go on?
 

For drying clothes when I want to warm the house when a jumper and sleeping bag is not enough and never before November . I was homeless in my early 20s so know real cold and do not get really cold until it is freezing balls off the brass monkey

Re: When does your Heating usually go on?
 

i don't have central heating

Re: When does your Heating usually go on?
 

For us, it all depends on the weather. The thermostat makes the decision for us.

Re: When does your Heating usually go on?
 

Are you up Smurfs arse?

Re: When does your Heating usually go on?
 

My Hive thermostat tells me my heating only went on for 14mins which raised the house temperature 1.5c to 21.5c, I will likely put a jumper on now and keep the heating off until I return from work at 2.30pm tomorrow.

---------- Post added at 17:14 ---------- Previous post was at 17:09 ----------

20c on a thermostat is kinda low atleast for the colder winter months, mines currently set to 20c to test my improved heating system and I should be wearing a jumper now but this will raise to either 21-22c to stop me freezing my bollocks off in the coming months. I'm hoping I will feel less cold this year now I have far more heat coming from the radiators although my stairs are in my living room with a very large patio window so it's hard to keep that room toasty.

Re: When does your Heating usually go on?
 

Whenever Hive decides to turn it on.
It averaged about 1.5 hours in September, mostly in the early mornings, and early evening.
Technically its never turned off, its just that in the summer the temperature never drops low enough to trigger it.

Re: When does your Heating usually go on?
 

I have a cold draft from my kitchen. I want to put underfloor heating in there.

20 is unbearable for me. When I got my combi boiler put in the guy who installed it told me if my boiler temp reaches around 40 that's good. Having that temperature constant is perfect and you'll get low bills. I continue to see that with 15/16 on the thermostat. The gas man took temperatures in each room then set the boiler accordingly. I have since increased the boiler temperature to 60 for the winter but with the thermostat at 15.5 I still see temperatures of around 40.

Do you have double radiators? They are beasts.

Re: When does your Heating usually go on?
 

Single radiators here, but they all now have TRVs on since the boiler replacement, I also had my small bedroom radiator fixed and the 2nd radiator behind my living room computer desk recommissioned as I had kept that switched off for 25 years, so the house should technically be far easier to heat and keep warm, hopefully using less boiler gas time.

I never leave my heating on 24/7 and it's never on during the night, it goes off at 10pm, that seems like a waste of gas when there is no one home, but if someone is a night owl they would likely need the heating on still but I really don't see the point when I'm in bed. Heating gets turned back on remotely before I return home from work etc.

Re: When does your Heating usually go on?
 

I'm always home. I love home. Which explains the heating staying on. I just looked at the notes from the gas man and it reads 43 increase by 5-10 for the winter.

Re: When does your Heating usually go on?
 

Our house is in use 24 x 7, its very rare for no one at all to be in.

Re: When does your Heating usually go on?
 

That's a blessing in disguise Boss :tu:

Re: When does your Heating usually go on?
 

SkyNews have a heating feature this week

I leave mine on low :scratch:

Re: When does your Heating usually go on?
 

no heat on and back door wide open all day

but i did top up the coal bunker yesterday morning so ready for winter when it comes

Re: When does your Heating usually go on?
 

You have to sign up to some newsletter ? No thanks.

Re: When does your Heating usually go on?
 

Ours will go on when we are uncomfortable without it. The thermostat is set to 19 as it is in the hallway. Not the best place but since we have an open fire in the front room so that would spoil things siting it there. My preference would be to have it warm enough to be in shorts and T-shirt but the heating never gets that warm enough.

Re: When does your Heating usually go on?
 

Our heating goes on as and when required, first thing in the morning for 2 hours, then approx 4 till 8pm.:)

Re: When does your Heating usually go on?
 

I rarely wear trousers, even in snow. It's the tips of my fingers that suffer the most in cold weather so I have insulated gloves. Bit weird shorts, jumper and gloves :LOL: anywho indoors I'm in shorts and t-shirt comfortably with my thermostat at 15.5. The gas man tells me the thermostat is always a couple of degrees out so once the boiler has fired up and satisfied the thermostat it's like 17. My thermometer localed where my thermostat is reads between 21-24c :shrug:

Re: When does your Heating usually go on?
 

Something is really off there, likely your thermostat is reading way below what it should be and your house is alot warmer than you think and likely 24c, but it depends on your body fat too I guess. My Hive thermostat is currently set to 20c while I am at home and it's comfortable in just a T-shirt and jeans and when the house is empty or I'm sleeping the heating goes OFF, no point wasting Gas. In colder months the heating will get turned up to 21-22c and a jumper goes on, I couldn't set it at 24c I'd melt.

Treat yourself to a new wall thermostat.

I've also got a crazy neighbour that wears shorts all year around but he's from New Zealand and will spend 6 months there from November.

Burnt my foot on the radiator yesterday morning reaching out from my bed to see how hot my radiator gets in 5mins!!! I can't believe the difference my new boiler has made to heating the house.

Re: When does your Heating usually go on?
 

I've had the thermostat checked for faults. To be sure it was replaced but no faults were found.

Crazy is good. No need to dress up like an Eskimo :D

Re: When does your Heating usually go on?
 

Something is off if thermostat doesn't match the thermometer though, my new Hive thermostat matches pretty much exactly unless the thermometer has a radiator next to it.

What's your annual gas usage like out of interest and are there other people living in your house when you're not home?

Re: When does your Heating usually go on?
 

[That's what I thought but these things are not accurate according to qualified people so I've learnt to live with the whooping 5 degree difference. My thermostat is a Honeywell round spinning thing. I was thinking of a digital thermostat but again the installers 10 years ago said go for the round thing. I'll mention it when my annual service occurs. :tu:

Don't know of annual gas. I'll have to look at a bill. Just me. I wish there was a cat tenant but I haven't got another kitty since my childhood one died :(

Re: When does your Heating usually go on?
 

My Honeywell got replaced with a Tado smart thermostat and after boiler upgrade a Hive smart thermostat, I highly recommend it, it's great to turn off the heating when you leave home and when you're on the train coming back from Brighton turn it on again via your phone if it tells you the temperature is too cold.

It is possible your dial on the Honeywell has slipped it's position and you should be able to pull the plastic dial off and put it back on again in a different location so it reads more accurately, I know this as it happened to mine.

Re: When does your Heating usually go on?
 

I'm not going to mess around with it. I'll for sure raise it when my next annual service comes about :tu: the features sure sound appealing :D

Re: When does your Heating usually go on?
 

Older central heating is affected by 2 forms of hysteresis.

The first is when the thermostat cuts off the heating when it reaches the desired temperature, but the hot water in the radiator continues to warm the room.

The second is due to mechanical thermostats having a lag between their on and off conditions. This can get worse over time as internal springs and magnets become less effective.

A cheap electronic thermostat overcomes this due to it using a thermocouple.

Re: When does your Heating usually go on?
 

The boiler cuts out when the thermostat clicks and vice versa temperature low temperature high. There is no lag. The boiler stops heating but circulation continues. Just the gap in temperature reading is of an issue

---------- Post added at 12:56 ---------- Previous post was at 12:17 ----------

:LOL: I just realised I don't have home broadband, I tether from the device that is with me on my travels so remote control isn't an option. I will still chase an upgrade.

Re: When does your Heating usually go on?
 

My heating goes on when I get too cold. I start with an extra layer etc, a blanket or body warmer but when you don't have much meat on your bones you don't have much choice.

Re: When does your Heating usually go on?
 

My wife suffers from that one. She thinks that when the heating goes off everything should immediately get cold.

I'm often intrigued by her strange thought processes . . . like when she used to leave the outside (garden) lights on "so the cat can see what it's doing out there in the dark"

:shrug: :nutter:

Re: When does your Heating usually go on?
 

Yeah, a smart thermostat will be useless to you without home broadband when not at home.

Re: When does your Heating usually go on?
 

If we could have had a Worcester thermostat with our new boiler then the pump would keep running after the flame had cut off. (We couldn't because the Worcester thermostat needed mains and there are no sockets near where we need to site the thermostat.)

Re: When does your Heating usually go on?
 

My Ideal boiler pump sounds like it keeps running after the flame goes out for a short time and my Hive wall thermostat is battery operated and it's control unit is where my old control unit was in my airing cupboard, my plumber wired everything in to code, so I would have thought your plumber should have been able to do yours too and connect it to the same power he connected your boiler to.

---------- Post added at 10:28 ---------- Previous post was at 10:10 ----------

What are peoples boiler control temps set at, I guess mines set too high at 80c and I could turn it down to 60-70c and still get efficiency? I guess a plumber often turns it right up when it's fitted and being serviced and often leave it there.

Re: When does your Heating usually go on?
 

When ours was fitted it was set at 60, wife moaned the water was too hot so I reset it to 50.
She then moaned the water wasn't hot enough, so I put it back to 60 and told her it was now at 55.

No complaints

Sometimes it's like living with Goldilocks

Re: When does your Heating usually go on?
 

:D

I've set mine to 60c and I'll see how it affects my Mega flow hot water tank and radiators as well as my gas usage.

Re: When does your Heating usually go on?
 

The gas man will have a service mode no need to raise or lower temperature. Mine as I mentioned was set at 43 when installed with advisable increase of 5-10 in the winter period. I don't follow that advice anymore. During the gas and electric hikes the advice given by government was to set the boiler at 60 so I did so. My water is set to 50 because my shower only goes that high, anything more would be a waste tbh the taps are mine at 50.

Did you gas man toggle your boiler to be in comfort mode so hot water is always readily available instead of the boiler manually calling for hot water when you turn the tap on? Mine is off. It adds to the bill considerably when on.

There's no efficiency while your boiler is set too high. The whole point of it is to steam inside, recycle the heat your boiler produces. Your boiler must be extracting a lot of heat through the exhaust pipe.

Re: When does your Heating usually go on?
 

I've got a modern condensing boiler but it's also a system boiler because I kept my tank so I'm not really sure if the boiler temp just affects radiator temp because the tank has a dial on it for temperature under a screwed panel, I guess I'll find out in a few days.

Edit- I remember when I bought the house 28yrs ago I had to turn up the tank temperature because the hot water never got hot enough so I guess I have answered my own question.

Re: When does your Heating usually go on?
 

Oh. Then what I said doesn't apply to you. My combi boiler does water and heat instantly no tanks. My airing cupboard is so spacious now.

Re: When does your Heating usually go on?
 

It's the same here. No tank of pipes in the attic to freeze, and all that extra space for storage where the hot tank used to be.

Our combi cannot have the hot water temperature adjusted because:

"A UK boiler's hot water temperature should be at a minimum of 60C to kill Legionella bacteria, as recommended by the HSE. "

But I thought that was only in the case of you having a hot water storage tank? :dunce:

Re: When does your Heating usually go on?
 

I'm not sure why 3 plumbers all said keep the Mega Flow tank rather than change to a Combi but I kept it as also a neighbour did too. I'm told the Mega Flow will give me better water pressure on my hot taps for a shower and the added benefit is it has a built in emersion heatercwhich has saved me atleast 4 times when I've had no hot water due to boiler issues, the main one being last late Christmas for a whole week, it died the night before I returned home and the house temperature dropped to 8c!!!! As it was a super cold period.

Ultimately I couldn't be happier with my current setup but it would have been nice to have an empty airing cupboard.

Re: When does your Heating usually go on?
 

*point one: never listen to Government advice, they know less than you do.

*point two: efficiency (to me) means setting the boiler temp to something which heats the water and therefore the radiators to a level where I feel comfortable in the house, not setting everything so I save 14p a day on the cost and wear thermal underwear :D

Re: When does your Heating usually go on?
 

I've had a rethink, I can't go into the winter with 15.5 on the thermostat. I have a professional booked for Friday morning. I only need a heating thermostat. Any recommendations please? Smart or digital. I'm not going for a manual dial thermostat again that's for sure :no:

Re: When does your Heating usually go on?
 

System boiler, set to 66C.
Water is set to just above 60C.

---------- Post added at 17:50 ---------- Previous post was at 17:49 ----------

As I understand it, setting condensing boilers too high stops them working efficiently.

Re: When does your Heating usually go on?
 

A smart thermostat isn't any use to you outside the house with no home broadband unless you can sort that out.

I was looking at both my room clock thermometers today and they were pretty spot on when comparing to my Hive on my phone app.

Re: When does your Heating usually go on?
 

Have a look at the Honeywell Home DT4 Grey Wired Room Thermostat. It is battery operated and has loads of functions. Or just ignore them and use a dumb thermostat.

Re: When does your Heating usually go on?
 

Hive (and I assume similar) will work fine internally, you just wont be able to control them from outside your home unless you have a fixed internet connection.

I do, but until recently I could probably count on one hand the number of times (in 10+ years) that I've connected to it from outside the home, I just left it running on its schedule. Since Jan this year I have run a slightly different system involving one of my servers, switchbot, and Alexa routines, so now I do need the connectivity.

Re: When does your Heating usually go on?
 

We have Hive but it can't run the heating pump past the flame off.
Water temperature is set to 50C (below scalding point) and heating is 60 or so.
Thermostat is at 19 in the hall but never reaches that. I guess because it is at the bottom of the stairs lots of heat just flows up there but the house feels cold, no draughts just a solid concrete floor that is not likely to have been installed with decent "insulation" or isolation.

Re: When does your Heating usually go on?
 

My boiler seems to be ON more since reducing it from 80c to 60c because looking at the Hive Graph for heating it says total time is already 1hr and yesterday it was only 40mins, this is under the same exact house temperature conditions as yesterday, so I'm not sure what to make of it.

Does my boiler being on longer mean I am using more gas or maybe it is using less gas when on? Think I'll have to compare the gas usage this evening and compare whether it's more or less.

Re: When does your Heating usually go on?
 

Thats expected, mine does the same, as far as I can tell its using less gas.

Re: When does your Heating usually go on?
 

Rescheduled for next week :banghead: the positive is the dial thermostat will be removed :D

Re: When does your Heating usually go on?
 

Replacing it I hope with a working one.

Re: When does your Heating usually go on?
 

:Yes: I said get me the best one :shrug:

He said my current one is showing lower temperatures and the replacement might show higher temperatures :LOL:

Re: When does your Heating usually go on?
 

Heating is for wimps. Invest in a nice jumper and eat curry :)

Re: When does your Heating usually go on?
 

He will likely just get the same as what you already have so it's easy to replace, unless yours is obsolete.

If he turns up with a Hive that'll cost, hopefully he won't in your no home broadband circumstances.

Re: When does your Heating usually go on?
 

:shocked: no no :no: it won't be the same. I'm done with that dial. It's got to go.

Re: When does your Heating usually go on?
 

Digital it is then without being smart.

Re: When does your Heating usually go on?
 

Bit like me :naughty:

Re: When does your Heating usually go on?
 

Did you look at the Honeywell Home DT4 Grey Wired Room Thermostat?

Re: When does your Heating usually go on?
 

I did. I watched a video on YouTube too. I like the hive. It just seems a lot more going on with the hive. It'll be funny if the gas man turns up with your pick :LOL: I don't care tbh I want something that tells the temperature and can easily be navigated.

Re: When does your Heating usually go on?
 

If he turns up with a Hive he will be asking where your broadband hub is where he can plug it in. Lol

Re: When does your Heating usually go on?
 

I have internet when I'm home

https://www.cableforum.uk/board/show...php?t=33713484

Just not when I'm out. My other devices don't suffer from this set up. My soundbars connect no issue on and off. A smart thermostat should be ok.. :confused:

Re: When does your Heating usually go on?
 

If he can plug the hub in to your home router you should be ok, I'm not sure if the hub is wireless.

You will need a control unit hard wired I think, they put one in my airing cupboard replacing my honey well controller but I only ever look at the lights on it and control everything from my phone.

---------- Post added at 20:14 ---------- Previous post was at 20:13 ----------

Did you specifically ask for a Hive? I hope you did if you want one.

---------- Post added at 20:20 ---------- Previous post was at 20:14 ----------

This is what I have which is specific for a system boiler setup.

https://www.screwfix.com/p/hive-acti...ite-grey/246jk

Re: When does your Heating usually go on?
 

I don't mind what I get if I'm honest because I know very little about these devices. If the gas man turns up with a keep it simple stupid smart thermostat I'll be equally as happy as getting an all bells and whistles flagship device.

I asked for the best so it'll be interesting what he decides. I did say all bells and whistles. He took a quick look at my set up, asked me some questions then off he went happy as a Larry.

Questions,
Are you getting heat
Are you adjusting the trv
Is the water ok
Heating generally working away from the thermostat issue
Radiators getting hot
Temperature of the heating on the boiler

All of which I could answer phew! I told him no to another dial thermostat. So that's definitely not happening.

I like that display you have. Very nice :tu:

Re: When does your Heating usually go on?
 

Did he not ask you on cost? He's not going to buy a really expensive smart thermostat in case you have a heart attack on the price and fitting costs, so he will likely just get you a Honeywell digital without a dial and you will be happy.

Re: When does your Heating usually go on?
 

I said the best with all the bells and whistles which means a flagship device but it could also mean his judgement based on his experience so yeah could mean something less expensive :shrug:

Re: When does your Heating usually go on?
 

If it was me I'd contact him and say you want a Hive if that's what you really want because it's your house, your money and your choice not his.

Btw the Hive has an Away mode so before you go to Brighton if you know what time you're expected to return you can make it so it goes off when you leave and switch on before you get home, this means you don't need to control it when out of the house.

Re: When does your Heating usually go on?
 

I'm honestly not fussed

Re: When does your Heating usually go on?
 

If he turns up and installs a medical thermometer a bell and a whistle don't blame him. Lol you really need to tell him what you want because it's like me asking for a games console and getting an original Atari 2600 delivered instead of a PS5 Pro. Hehe

Re: When does your Heating usually go on?
 

How about I take you to the vet who'll stick a thermometer up your arse :shocked:

Re: When does your Heating usually go on?
 

:shocked:

Re: When does your Heating usually go on?
 

The gas man might tear me a new one :erm:

Re: When does your Heating usually go on?
 

One of my elderly neighbours had a new gas boiler fitted. It came with a remote control box that was hung on a wall. It acted as timer, thermostat and override.

She did not get on with it at all. All she wanted was a thing that she could turn on and off manually, and set the temperature.

The installer swapped it for a device similar to the DT4, and she was chuffed.

Re: When does your Heating usually go on?
 

How did you know taf :shocked: he turned up with a DT4 thermostat in white. Also a ST9100C timer. During install he found that the wires were too short so he's handed the job over to an electrician. The old thermostat has been put back.

Re: When does your Heating usually go on?
 

The DT4 is effectively an industry standard these days. Have fun reading the manual, and then ignoring 99% of it. This link is far easier to read than the insert in the box:

https://manuals.plus/honeywell/dt4-r...rmostat-manual

Re: When does your Heating usually go on?
 

The DT4 is reading 22c. The dial thinks it's 16c lol thermometer reads 21-24c

Re: When does your Heating usually go on?
 

You should be happy what he turned up with it looks good.

When you say Dial do you mean your old thermostat?

Re: When does your Heating usually go on?
 

Yeah the old dial spinning thermostat.

Re: When does your Heating usually go on?
 

We thought that must be the issue, when is the electrician fixing the wiring? I'm surprised your plumber can't do it.

Re: When does your Heating usually go on?
 

No idea. They will email me. I'm generally home so it's no bother if the electrician just turns up but I will be notified prior to arrival.

I like the new thermostat. Simple functions. The programmer looks dated but hey ho I'll generally leave that on constant unless it's the summer period.

The gas man didn't want to pull at the wire which is why hes passed it onto a qualified electrician.

Re: When does your Heating usually go on?
 

That's its basic selling point, no faffing around unless you want to.

Re: When does your Heating usually go on?
 

The electrician has come and gone all installed :D

On the programmer is says there's

off, system is off
Auto, as per programmer
Once, system will turn on as per first programmer setting and turn off at the last programmer time
Continuous, system remains on

The electrician said I suppose auto means as per the thermostat. Bit confusing tbh. I'd like on as per thermostat :confused:

Re: When does your Heating usually go on?
 

Time to read both manuals to find out where you set the on off times for the thermostat, but I'm guessing if you are able to program the thermostat for the times you want the heating on or off and at what temperature throughout a 24hr period then you would leave the programmer on constant because your thermostat is taking the control, this is what was happening with my Hive and older Tado smart setup.

Alternatively it maybe the other way around, I agree it would confuse me too.

---------- Post added at 15:38 ---------- Previous post was at 15:26 ----------

Edit

I'm now thinking you use the ST9100C timer to setup the times you want your heating on or off then the DT4 is used to control the temperature, I've no idea if the DT4 will allow you to press a button for a heating boost or whether you would do that on the ST9100C timer.

I guess you got what you asked for a thermostat that has a digital display but hopefully it gives you a little more control than a regular dial thermostat dumb system.

Re: When does your Heating usually go on?
 

I called the gas man out. He reset everything and it's working how it should. Continuous means system on as per thermostat. He doesn't know why it was firing up earlier with the temperature set lower than the room temperature. Strange :nutter:

Now I have the issue of temperature in the property. Before it was kicking in often so heat would be felt. Now with the room temperature reading being correct it's not firing up. I feel the cold chill even though it's hot enough to be comfortable.

What's your thermostat temperature set at? Mine is set to 20c.

Re: When does your Heating usually go on?
 

20c is kind of low, mines set at 22c this evening and it's comfortable with a jumper on although the outside weather isn't helping as it's dodgy as hell, but I don't walk around in skimpy shorts like you said you do.

Re: When does your Heating usually go on?
 

Damn. Thanks for that. I had to Google it :shocked: lovely derriere :naughty:

Re: When does your Heating usually go on?
 

Haha, but seriously I would expect someone to still be cold in this weather and 20-22c house temp is they wore shorts. I suspect your house was warmer before because of your useless wall thermostat reading 15c.

Does the DT4 now pretty much match what the room temp is?

Re: When does your Heating usually go on?
 

I'll adjust as the days go by. I don't want to heat the place up to a point where I can't breathe. I ain't opening the windows in this storm I went out earlier for milk :no: stayed in ever since. The electrician made fun of my shorts too. Massive dude, 24 stone wide not fat and tall. "Times have changed I was told to put a jumper on". Poor guy's eyes were failing. Couldn't make out the small screws that fix the programmer and thermostat to the back plate.

Yeah thermostat matches thermometer reading :tu:

Re: When does your Heating usually go on?
 

I'm glad you got the system you wanted, it does sound like it cost you a few £100 so hope it was worth it, I've no idea how much my plumber charged me for the Hive and what he charged for installing it as it was done when the boiler went in.

Out of interest how long do your radiators take to get red hot from cold? The reason I ask is mine only takes 5-10mins where my old boiler would take an hour and still not be red hot, I'm trying to guage just how terrible my old boiler and heating was.

Re: When does your Heating usually go on?
 

A few minutes I'd say. Do your radiators start to heat up instantly?

Re: When does your Heating usually go on?
 

Maybe a daft question, but do have TRVs fitted to all the radiators, apart from the one with the thermostat in?

Re: When does your Heating usually go on?
 

Manual trvs all round except from the radiator that loops. Why do you ask?

Re: When does your Heating usually go on?
 

Pretty much yes, something my old old boiler never did, atleast that I can remember as it was 28 years old.

Re: When does your Heating usually go on?
 

This is a fascinating thread. I'm totally gripped.

Re: When does your Heating usually go on?
 

it's definitely heating up

Re: When does your Heating usually go on?
 

Mine has been just overhauled last week by a new firm and it's been coming on the last 3 nights. I'm toasty warm at the moment.

Re: When does your Heating usually go on?
 

I've had to increase the desired temperature. 20c was far too cold this morning. I've put it on 21c which seems good right now.

Re: When does your Heating usually go on?
 

Wife put heating on yesterday, still can't see it needed.

Re: When does your Heating usually go on?
 

Most older installations I see had not been upgraded to TRVs, but a few had them fitted in the same area as the main thermostat. Luckily, their boilers had not exploded or spurted hot water as they had inbuilt pressure relief loops.

Re: When does your Heating usually go on?
 

I had the whole system upgraded around 10 years ago. New double radiators everywhere except bathroom, hallway and one in the front room. Two doubles are not allowed in the same room. New manual trvs, valves.

Do you have a delay between when your DT4 calls for heat and your boiler fires up? Also does your boiler temperature reach high levels? Mine is acting strange, a delay and boiler temp is in the 40s :shrug: