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Mend Vaillant 637e Luke Warm

Cool radiators and luke warm water.Vaillant compact 637e?

I have a Vaillant compact 637e. It seem to be working OK as it's running and there are no fault codes, but my radiant arn't getting very hot and my water isn't as warm as it has been in the past.....can any one tell me what's wrong?

Mark NVC
December 2009

Vaillant Vaillant 637e Heating, Home Heating Systems Luke Warm Vaillant

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Vaillant 637e - Cool Radiators & Lukewarm Water