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I forgot to say in the original post that in the past when I had a heating engineer in because I got occasional lockouts he told me to replace the main thermistor/thermostat which I assume is the device which is linked to the adjustable main thermostat temperature control. I did this and it has...

I have a Potterton Kingfisher Mf Cfl50 Boiler, sealed system, separate CH and HW valves. The boiler keeps going onto lockout and I'm after some advice. When reset and coldish it fires up fine. Pump goes OK, valves working OK, etc. After a few minutes the gas goes off and it continues...

Trying to reply to the posts so far. TTB is the sensor on the flue to detect blockages and downdraughts. No gate valves on the HW return. Only gate valve is on a short overrun bypass. I have played about with this. I leave it open by one turn. The zone valves all seem to work OK. I have...

I have a Kingfisher MF boiler, conventional flue, HW and CH zone valves on a sealed system. The boiler goes onto lockout condition every now and then. During that time pump still runs and reset button needs pressing before system will re-start. The problem appeared to be pretty random but now...