For some reason my Central Heating boiler is firing up and heating radiators when the Thermostat is not calling for heat.
My set up is as follows:-
Boiler: Potterton Suprima 60L
Programmer: Myson MEP 2 … heating set to “On” constantly, water set to “auto” coming on in the morning and then again around tea-time
Programmable Thermostat: Honeywell CM907 in hallway ... set to “Auto” for selected times and temperature (21C)
Heating: Honeywell Motorised Zone valve … is at “Auto” setting doesn’t appear to be a problem
Hot Water: Drayton Zone valve … is at “Auto” setting doesn’t appear to be a problem
Radiators: TRVs on each except for the radiator in hallway (nearest Thermostat)
The problem is that my boiler kicks in and some of the radiators become very hot making the associated rooms hotter than hoped for.
This is inconsistent but usually occurs late in the evening and I end up having to switch off my boiler at the mains which is obviously a concern because no heating at all during the night and waking up to a colder house than I would hope (via the Programmable Thermostat).
One time that this happened, I changed the setting on the Myson MEP Programmer to “off” for both the central heating and water heater but the Bolier remained fired up and radiators heating.
The Programmable Thermostat room temperature reading in the hallway is going above the 21C setting (because the radiator is hot) but the thermostat is not calling for heat i.e. the little flame icon is not illuminated as expected, therefore I don’t think this is the problem.
The zone valves in the cupboard next to the water tank seem OK too … both in Auto position.
I had thought maybe a problem with one or more TRV but I thought that with the Programmable Thermostat not calling for heat and the Programmer on the “off” position then these would override the TRV.
Is there another thermostat, switch or programmer on the boiler that could be the problem?
My set up is as follows:-
Boiler: Potterton Suprima 60L
Programmer: Myson MEP 2 … heating set to “On” constantly, water set to “auto” coming on in the morning and then again around tea-time
Programmable Thermostat: Honeywell CM907 in hallway ... set to “Auto” for selected times and temperature (21C)
Heating: Honeywell Motorised Zone valve … is at “Auto” setting doesn’t appear to be a problem
Hot Water: Drayton Zone valve … is at “Auto” setting doesn’t appear to be a problem
Radiators: TRVs on each except for the radiator in hallway (nearest Thermostat)
The problem is that my boiler kicks in and some of the radiators become very hot making the associated rooms hotter than hoped for.
This is inconsistent but usually occurs late in the evening and I end up having to switch off my boiler at the mains which is obviously a concern because no heating at all during the night and waking up to a colder house than I would hope (via the Programmable Thermostat).
One time that this happened, I changed the setting on the Myson MEP Programmer to “off” for both the central heating and water heater but the Bolier remained fired up and radiators heating.
The Programmable Thermostat room temperature reading in the hallway is going above the 21C setting (because the radiator is hot) but the thermostat is not calling for heat i.e. the little flame icon is not illuminated as expected, therefore I don’t think this is the problem.
The zone valves in the cupboard next to the water tank seem OK too … both in Auto position.
I had thought maybe a problem with one or more TRV but I thought that with the Programmable Thermostat not calling for heat and the Programmer on the “off” position then these would override the TRV.
Is there another thermostat, switch or programmer on the boiler that could be the problem?