Turbomax plus CH cones on for 10 seconds then F22.

[deckof]

Boiler starts up, runs for 10 seconds then stops. Actions taken, check and cleaned pump head. ( does run and no debris in inpeller) isolated all but two rads which are i know are clean and tried running and have sentinel x800 the system, when it initially happened i did give the pump a little clout and it worked for a day, then it now never runs for more than 10 seconds and then does the F22 or ocxasionally f24 error coded. I think that leaves debris in PHE or faulty pump, NTCs, PCB or powerflush needed. Any ideas guys, have i missed anything, Next step is engineer but just posting this first for any reaction. Many thanks, HNY!!!

 

[cross thread]

If I have the correct model ,above the pump is a micro switch that should make and break when pump starts/ stops is this happening

 

[deckof]

Will check, ta!!

 

[deckof]

Will check, ta

 

[Johntheo5]

Some boilers detect the pump running when they sense a rise in pressure, watch the boiler pressure when it starts up and see does it rise by say 0.25/0.5bar.

 

[deckof]

thank you for your reply, no change on pressure gauge whatsover.

 

[CBW]

Some boilers detect the pump running when they sense a rise in pressure, watch the boiler pressure when it starts up and see does it rise by say 0.25/0.5bar.

I think this model has a pump proving switch as per @cross thread

 

[deckof]

Sorry, should have been more specific, the model is 824e

 

[ianmcd]

You will regret leaving X800 in there

 

[deckof]

Thanks, should have been more specific, removed the x800 after a day.

 

[deckof]

I have now established that the pump is not running when boiler fires up and dont think its capacitor as still doesnt run with a nudge. Cant ascertain if pump is receiving voltage but believe so as boiler goes through all other motions correctly then cuts out after 15 secs with f22.

 

[deckof]

Pump Kaput