potterton prima 40F won't fire up

[mark333]

Hi
I have the above conventional boiler and it will not fire up,and the pilot light doe's not attempt to lite
The fan starts but then stops after about 20 seconds.
I have changed pressure switch and boiler stat but still have same problem.
Has anyone got any idea's ?
Thanks for any advise
Mark

 

[corgiman]

Why did you change them and not the PCB

its a bit of a comman PCB failure symptom is the old fan cycling

 

[mark333]

Cheers corgiman
Will change it asap
Mark

 

[corgiman]

expect to pay about 80 Plus vat

good luck

 

[Soggy_weetabix]

Cheap!

HRPC prices are higher.

£138 all but a penny. Where can I get a board for 80 notes retail?

 

[corgiman]

shoreheat


thats where we get them

 

[mark333]

Fitted new board and all was fine for a month. Now the boiler will not fire up .When i power up The voltage across the fan terminals on the board is only there for about half a second then there is nothing . Do you think i nead another new board?

Thanks for any comments.

 

[Soggy_weetabix]

Have you changed the pressure switch because its faulty?

Have you checked tubes before you changed it?

David

 

[geoff@cetltd]

£30 ++

 

[Agile]

"""Fitted new board and all was fine for a month. Now the boiler will not fire up ."""

What do you expect if you only paid £80 instead of £138 less a penny.

I do have to wonder if there is an underlying fault that has not been detected?

Did you measure the gas valve operating coil resistance?

Tony

 

[geoff@cetltd]

broken wire in a molex connector ?

 

[Soggy_weetabix]

"""Fitted new board and all was fine for a month. Now the boiler will not fire up ."""

What do you expect if you only paid £80 instead of £138 less a penny.

I do have to wonder if there is an underlying fault that has not been detected?

Did you measure the gas valve operating coil resistance?

Tony

Very good point Tony!

Not a common fault (for me) but one an engineer would look for.

David.