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The problem is when the DHW is turned off and when preheat hits temperature, you hear the pump over runs for 30 sec to dissipate the heat and during the DHW over run I can hear air in the system but the air is not heard when CH is on and only on DHW over run. Is this normal, do I have a...

Baxi 105e Instant. The boiler appears to work normally the CH works and the DHW heats to the set temperature. However, when the DHW tap is turned off and when preheat hits temperature, you hear the pump over runs for 30 sec to dissipate the heat, However, and only during the DHW over run I...

I have recently changed a leaking radiator valve due to low pressure now holding pressure when hot at 2bar. However, when the pre heat starts you can hear what appears to be air in the system when the pump runs, no leaks visible, but the bleed vale appears to worked although covered in lime...

I have a Baxi Potterton Instant 105e which appears to function well CH and DHW works fine together boiler modulates etc. I have recently changed a leaking radiator valve due to low pressure now holding pressure when hot at 2bar. However, when the CH is off and the DHW pre heat starts you can...