Yes, the pump does have slot valves. Last plumber changed it by closing these as pointed out by Tony. Pump is about a year or so old as was changed last year. I had multiple calls from homeserve engineers who could not fix our heating issues. May seem not to understand the system we have. Hence this time i've been posting on here, before getting anyone out
I have since not experienced any noise since turning the boiler and pump down.
Last night i turned the boiler back up to HIGH and left the pump on setting 2. 5 am this morning the loud rumbling began again!! Seems to be at end of boiler heating up the store.
So i'm convinced it is something to do with the boiler stat? Is the water getting too hot and the boiler is not cutting out? or some other posts mention the pump cuts out to earlier due to some wiring issue as the boiler stays on for a short while after pump cuts out?
Gut feeling it is over spill from system and escapes via thermal store to F&E tank above, creation the rumbling?
Barry
I have since not experienced any noise since turning the boiler and pump down.
Last night i turned the boiler back up to HIGH and left the pump on setting 2. 5 am this morning the loud rumbling began again!! Seems to be at end of boiler heating up the store.
So i'm convinced it is something to do with the boiler stat? Is the water getting too hot and the boiler is not cutting out? or some other posts mention the pump cuts out to earlier due to some wiring issue as the boiler stays on for a short while after pump cuts out?
Gut feeling it is over spill from system and escapes via thermal store to F&E tank above, creation the rumbling?
Barry