Recheck your wiring on programer for Boiler on/off, kettleing check pump flow rate and gas rate and is the pump overun thermostate working O/K plus the main thermostate they are held together in same file on boiler, also depending the age of your heating system may need a powerflush, but try some fenox mb1 as well this should help noisey boilers!
Ray Dawson
July 2009
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