vaillant ecoTEC plus boiler fault code - how to fix?
What does f.25 mean?
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resetting thermostatat?
my vaillant boiler is saying a code com on it ?
how do I rectify the fault as detailed below?
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How can I fix my Vailant Eco tec plus 438?
can i replace my Potterton EP2 2 way programmer with a Center EHE0200361 RF?
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