how do I rectify the fault as detailed below?
How can I fix my Vailant Eco tec plus 438?
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my boiler will no work?
No hot water, intermittent when air temp drops?
Why is heating on at night?
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my vaillant boiler is saying a code com on it ?
Hot water comes and goes!?
resetting thermostatat?
vaillant ecoTEC plus boiler fault code - how to fix?