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thanks - if it is just the thermistor then happy days - am getting a new one on monday and will let u know what happens thanks dermot

i should say that it is a sealed system and I can hear the pump working and it seems to working okay. I haven't changed pump settings in last year and it gave no trouble since then. How would I change the speed of the pump any way? thanks

water is fine.Have pressure of 2 1/2 bar. .yes I have the thin manual from the new pcb board and I followed the troubleshooting procedure diagram. The flashing red light according to the flow chart indicates it is either therimstor or the pcb board. It tells me to check the resistence of the...

I SHOULD SAY THAT 1. THE HOUSE IS FREEZING AND 2.I AM NOT AN ELECTRICIAN BUT ON OBJECTION TO HAVING A GO ANT PLUG AND PLAY REPLACEMENTS. IS IT PCB BOARD? IS IT THERMISTOR?

Boiler won't work at all. Red light flashing on and off - 3 SEC'S ON AND 3 SEC'S OFF. Previously boiler was moody (used to fire up for 1o seconds and then cut ou t most of the time but lways seemed to work early in morning and then again at night) but Had PCB board replaced 11 months ago...