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[Help] Weird CH boiler behaviour - any thoughts pls?



Goldstone1976

Goldstone1976

We Got Calde in!!
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Apr 30, 2013
13,789
Herts
I have a combi boiler with TRVs on the rads, and a room thermostat.

The boiler temperature is set to 70c for the rads and is currently showing 56c. The thermostat is set to 20c, and is showing current temperature as 18c.

You’d expect the boiler to be on, right? Nuh uh.

If I turn the thermostat down to, say, 10c, and then turn it back up to 20c - the boiler goes on - for 10 minutes, then goes off again, leaving the room thermostat reading 18c still.

Anyone got any suggestions please?

Yep, I have indeed turned the boiler off and back on again.
 






Goldstone1976

Goldstone1976

We Got Calde in!!
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Apr 30, 2013
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Herts
bn9 bha said:
Put on a jumper if you’re cold :)

Some room stats don’t actually read 100% true, if you turned the room stat to 25 the heating would probably run.
It maybe not cold enough for the heating to work at 20.
Click to expand...

Ta - I’ll tell the missus to do that.

I can hear the relay kick in to turn the boiler on when i turn the thermostat past 18c - and the boiler does indeed fire, for 10 mins.

Weird, huh?
 




BN9 BHA

BN9 BHA

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Jul 14, 2013
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Goldstone1976 said:
Ta - I’ll tell the missus to do that.

I can hear the relay kick in to turn the boiler on when i turn the thermostat past 18c - and the boiler does indeed fire, for 10 mins.

Weird, huh?
Click to expand...

If you turned the room stat up fully ( some go to 30 ) would the boiler run for longer?
 








Curious Orange

Curious Orange

Punxsatawney Phil
Jul 5, 2003
9,962
On NSC for over two decades...
Is the thermostat one of those ones that you can set different target temperatures throughout the day, or a traditional one where you just set one temperature?
 




vagabond

vagabond

Well-known member
May 17, 2019
9,804
Brighton
Am I the only one who read this “CH” as Chris Hughton?

“Boiler behaviour”. Lord knows what madness I expected in this thread.
 


Shooting Star

Shooting Star

Well-known member
Apr 29, 2011
2,798
Suffolk
Agreed - I thought it was going to be a thread of Chrissy losing it with a NSFW goal celebration.
 








M

METALMICKY

Well-known member
Jan 30, 2004
6,081
Curious Orange said:
Is the thermostat one of those ones that you can set different target temperatures throughout the day, or a traditional one where you just set one temperature?
Click to expand...

Got one of those. A Honeywell CM727 and thank God for a YouTube video that made more sense than the instruction leaflet.
 


Harry Wilson's tackle

Harry Wilson's tackle

Harry Wilson's Tackle
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Oct 8, 2003
50,200
Faversham
Goldstone1976 said:
I have a combi boiler with TRVs on the rads, and a room thermostat.

The boiler temperature is set to 70c for the rads and is currently showing 56c. The thermostat is set to 20c, and is showing current temperature as 18c.

You’d expect the boiler to be on, right? Nuh uh.

If I turn the thermostat down to, say, 10c, and then turn it back up to 20c - the boiler goes on - for 10 minutes, then goes off again, leaving the room thermostat reading 18c still.

Anyone got any suggestions please?

Yep, I have indeed turned the boiler off and back on again.
Click to expand...

It may be the water pressure. Ours conks out every couple of years due to this. There are brilliant online vids to show you how to fix this. https://www.youtube.com/watch?reload=9&v=AV4dqnkxGQM
 




Curious Orange

Curious Orange

Punxsatawney Phil
Jul 5, 2003
9,962
On NSC for over two decades...
METALMICKY said:
Got one of those. A Honeywell CM727 and thank God for a YouTube video that made more sense than the instruction leaflet.
Click to expand...

We inherited our one when we moved in about a year ago and I've had it on manual until a couple of weeks ago! Once you get your mind round the fact you now have two timers - one for boiler availability, and the other for target temperatures throughout the day - it is actually quite useful, and we've been tweaking the targets as we get used to how the house reacts and what is comfortable for us. The main problem I had was finding a decent position for it where the signal wasn't getting blocked by our rather solid internal walls, eventually settled on the downstairs toilet :lol:.
 




Goldstone1976

Goldstone1976

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Apr 30, 2013
13,789
Herts
bhanutz said:
Heat exchange? get an engineer round
Click to expand...

Maybe. I’m going to continue playing today - resetting it, turning it off and on again (again), and, err... that’s about it tbh.

If a miracle doesn’t happen, I’ll be on the blower in the morning.
 


M

METALMICKY

Well-known member
Jan 30, 2004
6,081
Curious Orange said:
We inherited our one when we moved in about a year ago and I've had it on manual until a couple of weeks ago! Once you get your mind round the fact you now have two timers - one for boiler availability, and the other for target temperatures throughout the day - it is actually quite useful, and we've been tweaking the targets as we get used to how the house reacts and what is comfortable for us. The main problem I had was finding a decent position for it where the signal wasn't getting blocked by our rather solid internal walls, eventually settled on the downstairs toilet :lol:.
Click to expand...

Yes played that game. Starts doing something strange, wife moans so quick but uneconomical fix is to stick it manual. We also have some strange little box affixed to the outside wall adjacent to the combi boiler which is supposedly a weather compensation sensor. :dunce:
 


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