Glow-worm 30ci - heating stays on

[marev]

Got a problem with the heating side on our Glow-worm 30ci combi boiler not turning off even when room stat clicks off. The only way we can shut off the heating is to run a hot tap for about a minute.

This problem only seems to happen when we set the room stat above 16 degrees. 16 or below is fine.

Room stat is a Drayton Combi-stat and this is only about 6 months old. (previous one developed a fault)

 

[Agile]

You need electrical tests to show if there is still a call for heat!

Tony

 

[marev]

Update: heating came on last night even though the room stat was on zero.

 

[Agile]

Can you put your location in your profile?

Where abouts is the boiler fitted?

Tony

 

[marev]

Boiler is in the loft.

Downstairs - Drayton Lifestyle timer & Drayton Combi-Stat.

 

[easyflow]

Disconnect the room stat from the boiler, use the boiler temp control only.
If all works ok look towards the wireing or stat fault.

 

[Agile]

The boiler in the loft can get cold at night and that will initiate a frost protection operation.

The boiler probably just runs the pump at 5° C

But at 2° C it will bring on the burner!

There is always a possibility that the calibration of the boiler temp is a little out.

See what the outside temperature is when the boiler comes on when not called for!

Tony