Thermostat Off - Radiators on Full Blast

DampCat · 17 Aug 2019 at 15:59

I have a nest thermostat that's currently off, but several radiators (not all) are on full blast. Some are kinda warm, others are off (11 radiators total). Where on earth do I start to diagnose this?

Yours Frustratedly

DC

Saytan · 17 Aug 2019 at 17:24

If the rads are hot then presumably the boiler is currently burning. if it is then presumably the thermostat hasn't signalled it to turn off.

might be worth power cycling the thermostat and/or boiler

andy_mk3 · 17 Aug 2019 at 17:32

Because only some radiators are on, it might be a stuck diverter valve heating the rads with the hot water.

DampCat · 17 Aug 2019 at 17:44

Saytan said:
If the rads are hot then presumably the boiler is currently burning. if it is then presumably the thermostat hasn't signalled it to turn off.

might be worth power cycling the thermostat and/or boiler

Rebooting the thermostat now. The boiler was recently serviced/restarted in the last few days

DampCat · 17 Aug 2019 at 17:45

Th

andy_mk3 said:
Because only some radiators are on, it might be a stuck diverter valve heating the rads with the hot water.

They do on average seem to be on one side of the house. Sounds like a plumber

LuckyBenski · 17 Aug 2019 at 22:40

I'd ask the person who serviced your boiler what they broke

Is your system divided into zones? I'm confused as to how some radiators have come on and some haven't.

DampCat · 17 Aug 2019 at 23:43

LuckyBenski said:
I'd ask the person who serviced your boiler what they broke

Is your system divided into zones? I'm confused as to how some radiators have come on and some haven't.

Nope no zones that I'm aware of, just your bog standard central heating :/

NvidiaDan · 18 Aug 2019 at 20:16

Combi Boiler or heat only? could be a number of things

DampCat · 18 Aug 2019 at 23:32

NvidiaDan said:
Combi Boiler or heat only? could be a number of things

Heat only. Someone irl mentioned a valve as above so I think that'll be my first check

robj20 · 19 Aug 2019 at 05:37

DampCat said:
Heat only. Someone irl mentioned a valve as above so I think that'll be my first check

Great only you definitely have at least one valve somewhere. Find it and move it manually, does the radiator getting hit coincide with your hot water times?

psd99 · 19 Aug 2019 at 08:50

robj20 said:
Great only you definitely have at least one valve somewhere. Find it and move it manually, does the radiator getting hit coincide with your hot water times?

This, I have the exact same problem. Also are the closest radiators to the boiler the ones that are getting warm?

I just turn the rads off that are closest to the boiler in the summer months.