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Mend Potterton Prima Home Heating Systems

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My boiler pump runs continuously and fires even when timer switch is off?

The zone valves have been replaced but boiler still fires after the CH and HW is switched off and the over run radiator is hot.

Where would the frost stat be on a Potterton Prima boiler and how can I check whether this is working correctly?

Malcolm
January 2012

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Mend Heating, Home Heating Systems
Mend repair fix Potterton Prima home heating systems