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