Potterton Promax HE 15 stays on constantly

[Kitch999]

problem will be on the system controls not on boiler

Ok - do you mean where I switch it on or off and set the timings etc? Do you need a picture of that too?

 

[village idiot]

something like this
V4073A Motorised Midposition Diverter Valve - Honeywell UK Heating Controls

 

[Kitch999]

Hi again - having switched the boiler off overnight, I switched it on again this morning (right in the middle of a scheduled program). It fired up fine, stayed at the correct temperature and switched off at the correct time.

Then it came on again this afternoon at the correct time and stayed at the right temp again.

After the message last night from village idiot, I found the diverter valve and gave it a little wiggle as I tried to see the manufacturer. No idea if that has made the difference. Presumably its not fixed and its knackered in some way.

Any thoughts from anyone?

Cheers.

 

[Tjdservices]

Post a pic of the motorised valve, someone will be able to id it