Powermax 155x - Hot Water but no Central Heating

[Buzz9991]

After reading numerous posts, I have checked the CH pump and it seems to be able to move quite freely, so not seized.

Could the problem be the thromostat, even when the mains is connected to it, it doesn't click.

Also if the water pressure was too low would it cause the boiler to lock-out?, if I need to repressurise, where is the hose, I have been all around the boiler and cannot find it,

Forgive my ignorance, a newbie at CH plumbing.

 

[twgas]

Do you have HW? these boilers have HW priority so the HW must be satisfied before the heating will work.

 

[Buzz9991]

Yes we have hot water, does this shed any more light

 

[twgas]

do you have power coming back from the roomstat? if yes it might be the cold start stat (that's the HW priority bit).
Do you have power to the pump?

 

[Buzz9991]

Sounds like I need to start tracing voltages to see where the problem lies.

I have (maybe rashly) bought another room stat and will fit this tomorrow and see if this resolves the problem.

 

[twgas]

If you can test for voltages, why not check to see if there is power to and from roomstat before you decide o scrap it.