Potterton Prima 80F. Will not light but does if i pinch red tube to aps.

[armyash]

Went to this boiler, it had been working intermittently now it will not light at all.

the pas will click, the fan will spin for a second then stop. The boiler does not light.

Replaced APS, still no joy.

If i pinch the red tube the boiler lights up fine and runs until i let go.

Any ideas???

Been told it can't be the fan if it runs fine when i get it going.

PCB is apparently all thats left to??

 

[armyash]

PCB.......if anyone is interested.....that'll be a no then

 

[Scott_D]

Split tube to aps would have been my guess

 

[gassafe]

Most faults are that crappy pcb lol!

 

[Millsy 82]

Is that the boiler with the little brass bit in the aps tube as I've had a few of them block. A couple of minutes in boiling water and a squirt with airspray usually sorts it.

 

[Leo21]

Went to this boiler, it had been working intermittently now it will not light at all.

the pas will click, the fan will spin for a second then stop. The boiler does not light.

Replaced APS, still no joy.

If i pinch the red tube the boiler lights up fine and runs until i let go.

Any ideas???

Been told it can't be the fan if it runs fine when i get it going.

PCB is apparently all thats left to??

Just put a peg on the red tube the new.

 

[thereisawizza]

Always the PCB, usually failed solder joint where the Molex connector pushes on. Anyone every successfully resoldered one of these joints?

 

[julesverne]

Is that the boiler with the little brass bit in the aps tube as I've had a few of them block. A couple of minutes in boiling water and a squirt with airspray usually sorts it.

was going to say as well is this the one with the liittle piece of metal with a pin hole in the aps tube could be last person has taken it off and not refitted it or blocked .

 

[bright spark]

Is the fan loosing voltage, if it's not, fan could be going faulty.
It's worth checking just to rule it out

 

[townfanjon]

Check fan resistance , does it run freely, when you spin it with your finger

 

[armyash]

The fan was running freely, not that old.

Apologies for the slow update. It was the PCB.

 

[bright spark]

Good man. Another 1 sorted!