Since the weather turned colder a couple of weeks ago we have been unable to have heating without the hot water being on. Once the hot water reaches the desired temperature, the boiler shuts off and the only way to get heating again is to use the hot water up or to manually override the motorised 2 way valve.
I have tested the motorised 2 way valve on another system and it works fine.
I already had a spare programmer originally changed for visual reasons which I swapped back but no change.
I have rung approximately 15 local plumbers and all seem too busy to come out!
Full spec is as follows:
Potterton Promax 24 HE
Heatrae Sadia Megaflow Boiler
22mm Honeywell 2-Port Zone Valve V4043
Danfoss Randall HPA2 2 Port Valve Actuator
Invensys Drayton Lifestyle LP112 24 Hour Digital Dual Channel Programmer
Any pointers would be appreciated.