Thanks Josh,I have measured the HW thermistor, i'm getting 9.4 k/ohms when the system is cold,so I tried a 9k/ohm resistor across the ch terminals,to prove it.The system still cycles even with the fixed resistance in place.and the therm' drops down to approx 4.5 k/ohms
One other thing is if I run a hot water tap for a few seconds the burner stays lit and the CH works until the room stat shuts it down!!!!
Any ideas are welcome its doing my head in.
billthespark
November 2008
howtomendit.com for free repair help, information and advice.
