Baxi Bermuda BBU 15 HE shutting down at 30 degrees

[Philip]

Hi

I have a Baxi Bermuda BBU 15 HE condensing back boiler.

(y Plan Grunfos pump and honeywell three port valve.)

It fires up on demand all as expected

As soon as the water temperature reaches 30 the burner shuts off even though a heat demand signal is still present.

After a few minutes the boiler re-ignites again and the process repeats.

No error messages are displayed.

Any help or advice before I call in Baxi Engineer's would be appreciated.

Thanks

 

[lame plumber]

JUST CALL BAXI, IT MUST BE UNDER WARRANTEE still, didnt mean to shout

 

[Dotty]

Agreed.