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