Thanks for the advice MM,
The bolier is in the kitchen so i can't see frost being a problem?
if it is the motorised valve - (would that be the 'actuator'?) would it be a big job to sort?
No info pack was supplied, I'll contact the builder to see if I can get them to come down and have...
Potterton Promax boiler running off of a danfoss 2-channel timer (possibly model CP715).
When the timer is off, the boiler still fires up intermittently - heating the radiators (eg the heating was running at full pelt at 2am this morning, after the timer went off at 10pm)
It has been...