ideal isar m30100 problem help pls!

[ash1212002]

Ideal isar m30100 pcb has been replaced twice within 4-5 months and now at the moment the boiler does not fire up, condensate trap and gas valve has been checked

When the boiler is on i can hear the fan going...

but prior to the boiler working at times very intermittently i could hear an unusal noise that seemed to come from the fan

the boiler light on the user panel flashes (does not stay on permanent) then goes in to LF flame dectection error mode

My question is i have been told if the pcb has been replaced twice it could be the fan that is causing to burn out the pcb, so would it be best for me to replace the fan and the pcb?

Hopefully someone has been here before and I would be very grateful for any advice they could offer.

Thanks

 

[idealnumber1]

does the burner light stay on for any length of time?

 

[ash1212002]

the light does not stay on at all, the both flame and ignition electrodes have been replaced

 

[idealnumber1]

can you hear it trying to spark

 

[ash1212002]

yes i can hear it spark

 

[idealnumber1]

if the spark is loud the ignition lead has probably just come out of the pcb

 

[ash1212002]

the wiring is in the pcb, the boiler just wont fire up, all wiring has been checked

 

[Garfeild]

The fan can effect the pcb,but normally blows it,so dies completely,i would double check the ignition lead is securely connected to the pcb,i usually trim some of the red covering back a little,so you can make absolutely doubly sure the plug is on the connector.

 

[idealnumber1]

it is to do with the spark,if the noise is loud it's not connected to the board

 

[ash1212002]

i have checked and re-checked all the wiring and can assure you it is correctly connected to the pcb

any other ideas?

 

[superdupergasman]

Make sure the connector if fully home onto the gas valve.

I have see it so many times as its hidden behind the PCB.

Is the gas switched on...you are not on a pay as you go meter and it has run out?? or switched into safe mode??

 

[idealnumber1]

who checked the gas valve?

 

[ash1212002]

Gas is working fine, the valve has been checked myself, only reason why i think it is the pcb is because it has failed twice before and i have been informed its the fan because even though it is working at times it may spike the pcb which causes it to blow

 

[idealnumber1]

what working pressure did you get

 

[Agile]

Gas is working fine, the valve has been checked myself, only reason why i think it is the pcb is because it has failed twice before and i have been informed its the fan because even though it is working at times it may spike the pcb which causes it to blow

Can you explain exactly what you have done to check the gas valve?

Tony