can anyone help. My baxi 100 he was fitted 18months ago and I have had no problems till now. There seems to be no signal from the thermostat to the boiler and the heating wont turn off. It is turning on every 5 mins, I have turned all radiators bar 1 off via individual stats but the one thats left is burning (even though I have turned the heating temp down on boiler) and turning on every 5 mins. The installer is not being helpful and dosent want anything to do with it!! I cant afford the prices I have been quoted (£300) can anyone help, has anyone else had this problem?