can you help,just recently my central heating has stopped working,i have tried all the usuall thermostat,pressure in system,and there are no fault codes,my hot water is fine.a few suggestions are diverter valve,diverter microwsitch, ch thermistor,most said it was the thermistor,and said it was the one that clipped on the pipe ,thus no draining,i went to buy one,the parts person said it was the one that screwed in to the pipe,and everybody seems to call it by a different name,can you help what is the correct name and location of the ch thermistor if this is my problem, many thanks.

nick, May 2009

The LS80 has a screw in thermistor. You can fit a clip on thermistor instesd so you don't have to drain down the system, both the clip on and screw in thermistors do the same job.
I would also look at the digital timer, if red LED is dull and you can't here boiler relay clicking when you turn the timer on, that will cause boiler to fail in CH mode

C, June 2009