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Pre-heat drives me mad!
My combi gas boiler is an Ideal Isar and has an integral pre-heat facility for hot water. When the central heating is switched off during warmer months, the pre-heat fires up a few times a day. I totally get the logic for that.
However, when the heating is constantly on in colder weather, the pre-heat comes on approximately 12 times an hour, so let's say from 8am to 11pm that's like 180 times a day.
What happens is this. Starting from a cold morning, the heating fires up until the house is warm and the thermostat's temperature is reached. Ok so far. Then throughout the rest of the day, the boiler fires up every few minutes for heating for maybe 3 minutes. When it goes off, the pre-heat comes on for 2 minutes. By the time the pre-heat goes off, the heating comes back on again for another 3 minutes, goes off, then the pre-heat's back on. These actions are repeated all day.
I've had several British Gas engineers to check it and some have said it's meant to do that and some have said it's the divert valve. The latter have made out they fixed the valve, but it makes no difference. The actual pre-heat cannot be switched off on this particular boiler.
Does anybody experience this? Thanks...
However, when the heating is constantly on in colder weather, the pre-heat comes on approximately 12 times an hour, so let's say from 8am to 11pm that's like 180 times a day.
What happens is this. Starting from a cold morning, the heating fires up until the house is warm and the thermostat's temperature is reached. Ok so far. Then throughout the rest of the day, the boiler fires up every few minutes for heating for maybe 3 minutes. When it goes off, the pre-heat comes on for 2 minutes. By the time the pre-heat goes off, the heating comes back on again for another 3 minutes, goes off, then the pre-heat's back on. These actions are repeated all day.
I've had several British Gas engineers to check it and some have said it's meant to do that and some have said it's the divert valve. The latter have made out they fixed the valve, but it makes no difference. The actual pre-heat cannot be switched off on this particular boiler.
Does anybody experience this? Thanks...
0
Comments
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How do you know if the boiler firing is for the pre-heat tank, or to top up the central heating? i.e. is there a light showing the on/off status of the pre-heat?0
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When the central heating fires up it's indicated by a 'C'. For water a 'D' and for the pre-heat a 'T'0
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