no central heating after draining and refilling

[stephent123]

I have a powermax 155x (vented)

I installed some TRV's to some downstairs rads today. Drained the system and installed them, all seemed great. Refilled the system and bled all rads.

Tried to turn the CH on and it didnt work. The light is on on the programmer, the CH pipe to the pump is hot (to and after the pump) and I can still get hot water by turing the HW to constant. I cant get it using the programmer on its own.

I hope its not the programmer thats shot as i replaced it around 18 months ago. But surely draining the system wouldnt affect this?

The thermostat light will not come on downstairs. It clicks, but no light. As it clicks i am guessing its still working.

Any advice would be really helpful, as I am totally stuck. I am sure its something fairly simple that i have or havent done.

 

[45yearsagasman]

There is a cold start stat that prevents the ch working until the stored water temp gets to approx 65 deg C.

 

[stephent123]

Its not that, the water has heated up sufficiently.

could an airlock prevent the light from coming on on the thermostat?

 

[flameport]

could an airlock prevent the light from coming on on the thermostat?

No.

However if the thermostat indicator is not working, this suggests either there is no power reaching the thermostat, or the thermostat itself is broken.

 

[stephent123]

I am sure its the programmer.

 

[misterdubya]

I am sure its the programmer.

Why? Have you tested it?

If your sure, then bypass it.

 

[stephent123]

How would I bypass it? I am not a plumber by the way. You probably guessed mind lol.

 

[flameport]

What programmer is it?

Typically it would be bypassed by switching the power off, removing the programmer from the backplate and installing a wire link between live and the CH ON terminal.

 

[stephent123]

standard built in one.