Worcester greenstar intermittent fault

[hammers4spanner]

Attended this on friday heating and hotwater cut out after about two minutes , slow flash on blue light mainly on.

Reset boiler and same same, replaced flue stat and temp stat but still same fault .

 

[ShaunCorbs]

What's the gas pressure?

 

[hammers4spanner]

Sorry gas pressure and fga all good , checked electrical connections , pump was good and fan was good .
No blockage in condensate or any obstructions in flue.

 

[AMGasServices]

Could the heat exchanger be blocked ?

I’ve added the fault diagram.

 

[ShaunCorbs]

Rib hex ?

 

[hammers4spanner]

I checked most if that i thought hex could be blocked as when put it in service mode it locked out quick sharp. Mentioned it to customer and she went nuts as boilers only about 6 years old lol,,,,,,oh the joy

 

[AMGasServices]

I think a one off repair from Worcester is the way forward.

 

[Harvest Fields]

Which Greenstar? Did you check the pump?

 

[Harvest Fields]

I think a one off repair from Worcester is the way forward.

Not yet

 

[hammers4spanner]

Yes checked the pump was circulating fine

 

[Harvest Fields]

all rad valves open? Which Greenstar?

 

[dancinplumba]

out of interest how does everyone know a pump is doing what it should and moving water

 

[mfgs]

Diverter moving like it should?

 

[Last Plumber]

Get the red/orange burner gasket and an electrode set, remove the burner and check the top baffle. I have come across a few with splits or holes in that give similar symptoms.