My combi boiler gives plenty hot water when my heating is switched of but when i switch the heating on it runs cold (flow switch?) all help welcome
combi problems
- Thread starter salmon
- Start date
salmon said:
Given the following formula:-
Amount of help is directly proportional to the amount of information given by the OP
I can safely deduce that your boiler is knackered and needs fixing
The primary flow switch on some boilers when the diaphragm is getting stretched will make for heating but not hot water as the extra resistance to flow in the dhw circuit makes the difference. The way to trick these boilers is to call for heating then turn on a tap, the DV swicthes over without losing the instruction to the burner provided by the primary flow already activated by heating demand.
My diagnosis is new primary diaphragm, possible pump is tired, possible dhw heat exchanger is sludged up, but diaphragm will likely fix it for now.
My diagnosis is new primary diaphragm, possible pump is tired, possible dhw heat exchanger is sludged up, but diaphragm will likely fix it for now.
Paul, the strength of push by the primary flow switch varies greatly between boiler models and the heating circuit restrictions.
Some models push harder in CH and others in DHW. Thats not helped by those customers who turn off individual radiators.
I expect the flow switch is involved in this case but as the OP has disappeared then we will probably never know.
Tony
Some models push harder in CH and others in DHW. Thats not helped by those customers who turn off individual radiators.
I expect the flow switch is involved in this case but as the OP has disappeared then we will probably never know.
Tony
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