Radiators only lukewarm today - All OK last night!

[nitro23456]

Hi

Something strange is going on here. My heating has been fine so far until this morning. I have had the boiler on (potterton suprima HE condensing) for two hours now and the radiators are only warm.

Room stat set at 19c, 3-port valve is correctly in the heating position and flicks properly if HW needed. (indirect cyclinder)

I thinking pump has just gone today? (grudfos) used to be on speed I of III.... I have just flicked it up to II but no change in heat, but a little more noise.

Any thoughts?

 

[JohnD]

does the pump feel surprisingly hot, and hotter than the pipes connected to it?

If you bleed the highest radiators in the house, does water squirt out forcefully?

 

[nitro23456]

just got an error light on the boiler

'air pressure signal'

whats this?

 

[nitro23456]

sorry that should have been

'air pressure switch' as the light was flashing