Try searching for CL6P0120 which is a Potterton thermostat, several sites list it as suitable for Thorn M boilers. It also seems to go by the number "231844".
Mike Palmer
November 2009
Hi there,
We just moved into a new house and have the same problem with the boiler thermostat - did you ever find one?? If so, was it easy to fix?
Thanks!
Julie Wilson
Julie
February 2009
Automatic Answer
While you wait for answers, we may have found some information which could help you.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix home heating systems.