my vaillant boiler is saying a code com on it ?
Vaillant Thermocompact Fault?
No hot water, intermittent when air temp drops?
Hot water comes and goes!?
Vaillant ecomax 828/2 e water pressure sensor?
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Why is heating on at night?
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can i replace my Potterton EP2 2 way programmer with a Center EHE0200361 RF?
Vaillant F22 fault?
Advice?
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how do I rectify the fault as detailed below?
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