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- 2 Mar 2004
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I have vaillant Combi boiler and ever since we have moved in it has never managed to heat the room with the thermostat in to above 16/17 degrees c, or the rest of the flat for that matter. That is to say that after a period of time (reaching about 80 degrees c on the boiler thermometer) the boiler gives a status of \\\"pump over-run\\\" and the boiler temporarily stops until the internal temperature of the boiler has reduced to a suitable level. It will then fire up again and hit 80 degrees C before shutting off again - the cycle continues. In essence i think it is reaching max temperature internally without really moving the heat to the radiators. I have checked the pump speed, bleed the system etc. but still no joy. It is a relatively new system - about 4 years old i think. Any suggestions? getting annoying now.