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- 10 Oct 2008
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Hi,
Although the hot water works fine I have a strange problem with the CH which has gradually got worse.
I have tried several attempts at fixing this problem and yesterday even replaced the pump which has not corrected the problem. I realised after some thought about the matter that perhaps I am looking in the wrong areas.
The problem is that when the CH is switched on to constant the pump starts the boiler fires up and hot water is driven out the system all as expected. After about a minute the boiler switches off and then some time later it switches back on for a while and then back off. This cycle repeats.
For a completely cold system I would have expected the boiler to have stayed on until there was hot water being returned to the combi. In other words until the radiators had warmed up. This is not happening. In fact I am only able to fully warm a single radiator the way the system is at the moment.
I checked another combi this morning and found that the boilder did in fact remain fired until there was a hot water return and then it would operate as required to keep the radiators warm.
Can anyone tell me the most probable cause of this behaviour and what I need to resolve the problem?
FarmerJo
Although the hot water works fine I have a strange problem with the CH which has gradually got worse.
I have tried several attempts at fixing this problem and yesterday even replaced the pump which has not corrected the problem. I realised after some thought about the matter that perhaps I am looking in the wrong areas.
The problem is that when the CH is switched on to constant the pump starts the boiler fires up and hot water is driven out the system all as expected. After about a minute the boiler switches off and then some time later it switches back on for a while and then back off. This cycle repeats.
For a completely cold system I would have expected the boiler to have stayed on until there was hot water being returned to the combi. In other words until the radiators had warmed up. This is not happening. In fact I am only able to fully warm a single radiator the way the system is at the moment.
I checked another combi this morning and found that the boilder did in fact remain fired until there was a hot water return and then it would operate as required to keep the radiators warm.
Can anyone tell me the most probable cause of this behaviour and what I need to resolve the problem?
FarmerJo