my vaillant boiler is saying a code com on it ?
Vaillant ecotec 831 plus?
Why is heating on at night?
how do I rectify the fault as detailed below?
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No hot water, intermittent when air temp drops?
Problem with the pressure in combi boiler?
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no heating water?
can i replace my Potterton EP2 2 way programmer with a Center EHE0200361 RF?
resetting thermostatat?
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vaillant ecoTEC plus boiler fault code - how to fix?