glow worm boiler has stopped working - flashing lights indicate from fault finder book that the Thermistor needs replacing, how do you replace this part?
thermistor lead plugs into pcb and runs up to the top right middle back and down.it is held in place by a length of wire to stop it being pulled out,remove wire and lift out thermistor(long copper tube in two pieces so it's easy to get out)I have a 60FF and have ordered a new thermistor £38 from local shop but I can see online £20 +vat.The leds on bolier indicate thermistor fault(left flashes slow and right led flashes fast)boiler will not fire up the fan comes on but no ignition.
As far as I know the thermistor measures the temp of the bolier so it knows when to switch off when water is hot enough,it it doesn't work the bolier cant light up as it would get too hot and fail,so the thermistor is a saftey device aswell.
Simon
March 2010
what model is it ?
barry
November 2007
Automatic Answer
We may have found other answers which could help you.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix home heating systems.