Main Combi 24 HE Flame Failure

[Deleted member 120897]

Pump spins, and can be stopped with screwdriver.

Might be weak pump then, shouldn’t be able to stop pump with screwdriver unless your applying quite some force?

 

[Sandeep89]

Might be weak pump then, shouldn’t be able to stop pump with screwdriver unless your applying quite some force?

I didn't have to use much force at all. I could hear the pump making some ticking, very light grinding noise aswell. Had a look in MIs again last night which showed pump fault as well. Will do some more checks. Thanks for the help.

 

[ShaunCorbs]

Sounds like pump

 

[Sandeep89]

Hi Guys,

So replaced pump and both dhw and pump proving heating diagphrams.

The back pump proving pin still won't come out to make contact with the switch.

However if I make manual contact to switch burner fires up both on ch and hw.

Could it be a faulty diverter valve.

 

[Deleted member 120897]

Did you grease the spindle when replacing the diaphragm?

 

[Sandeep89]

Did you grease the spindle when replacing the diaphragm?

Yeah all greased up. Spoke to Main technical helpline who are saying as the boiler has been sitting idle for a long time the bypass pipe at the back may be blocked.

So that is next step they are saying to look into that.

 

[ShaunCorbs]

Also check the little 4-6mm pigs tail tube