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Potterton Ultra 2 BOiler problem?

My boiler and pump starts and runs for several minutes, or longer. Then it stops and goes into lockout. If I turn the thermostat on the boiler right down the pump restarts - when I turn the thermostat slowly back up the boiler starts up again, but shortly cuts out again. Sometimes the boiler/ pump go for an hour or more before cutting out - just long enough to heat the water. The same thing happens when using the central heating.

Any suggestions very wellcome.

Ian
Ian, April 2006
checkwater level in jockey tank poss in loft

paul, April 2006
link Click here to see other fixes for Potterton Ultra 2.