Gloworm Ultimate 50ff

[JAH HEATING]

Aren't there two boards for these? A seven an a five wire?

I tell you what it's not like swapping a board on an isar when changing these, not a straight swap by any means

 

[Gasmk1]

Aren't there two boards for these? A seven an a five wire?

I tell you what it's not like swapping a board on an isar when changing these, not a straight swap by any means

yes single or double fuse i dont mind changing them fiddly but easy.

 

[gassafe]

I replaced a faulty PCb on a glowworm ultimate once as it was dead, it then only got to the sparking stage & I thought the new pcb was a duff but it was the pilot injector absolutely blocked solid.... Little wire brush managed to clear it & was okay since!

This one hadn't been serviced with big pile sediment over burners etc

 

[Robert Tyrrell]

Just to update you all

I went back to this one yesterday and followed all the advice, but to no avail.
After following the fault finder in the MI I have determined that the air pressure switch has given up.
There was gas at the pilot, but the pilot doesn't light. I checked the gas with my Honeywell sniffer btw.
There's a good spark, and as the boiler is sparking away I checked voltage at the APS only to find that I didn't have 230v so I'm presuming that its the APS at fault.

Just two queries though:

If the fan isn't working at full speed can this cause a problem with the APS?
I ask because the fan is making a grating noise but it is running.

Is the Ultimate 50FF fan the same as the Micron 50FF fan? There appears to be a huge difference in the price for the two and yet they appear to be the same, looking at the images I can find.

 

[Last Plumber]

If it's sparking and gas is there it is not the pressure switch !
Is the spark in the right place and 2-4 mm from strike surface, have you filed or Emery papered it clean ?

 

[Last Plumber]

I still think pilot blockage !
Gas may be there but not enough.
Change pilot and electrode !

That's what I would be doing

 

[Gasmk1]

new pilot injector the holes are tiny in these it doesnt take much to block them

 

[Robert Tyrrell]

If the fan isn't working at full speed can this cause a problem with the APS?
I ask because the fan is making a grating noise but it is running.

Is the Ultimate 50FF fan the same as the Micron 50FF fan? There appears to be a huge difference in the price for the two and yet they appear to be the same, looking at the images I can find.

 

[quality]

If its sparking then the fan and APS switch are working

 

[Gasmk1]

fans do get noisy but it is operating the aps otherwise it wouldnt spark

1 call for heat
2 aps proves
3 spark
4 pilot solenoid open
6 pilot lights and proves with ionisation
7 main solenoid opens

you are getting to 4 so it has to be gas related (or spark is not enough to ignite ) you can prove this.