Can anyone suggest why my Potterton Netaheat Profile 60e boiler doesn't ignite? The fan runs and the air pressure switch is heard to operate - both the switch and the PCB being brand new components. The fan starts up in the normal way but no igniter action takes place. The igniter was working satisfactorily until an overheat cutout after air had entered the system from separate work elsewhere. Resetting has restored fan operation but not ignition.
Boiler not starting
- Thread starter FrederickDeLarge
- Start date
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You're lucky to have good enough hearing to tell that the pressure switch is working! The correct way is to test it for correct switching with a test meter and then go from there. If you changed the pcb and the aps are all the connections correct?
M
mysteryman
They will only run with the case on - it's a negative case pressure boiler.
No its not, its positive pressure and thats what makes it somewhat dangerous in the wrong hands. Correct in that it will only run with the case sealed correctly.
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M
mysteryman
Yes indeed, I was wrong about the pressure, but right about it needing the case on.
take its button at the bottom pcb what keeps flicking out
if so bled your rads try again if not get back to us
if so bled your rads try again if not get back to us
The main case was not removed and all was firing up fine until a system draindown necessitated closure (for diverter valve replacement). Unfortunately some air must have remained in the pipes after this and this caused the boiler overheat cutout to operate. On bleeding this air off, the reset switch was then activated. All then started up OK, minus the ignition sparks.
no fan would not start iwould get an rgi in
p.s. on this model aps is near the pcb out side the cc
p.s. on this model aps is near the pcb out side the cc
M
monoxide62
If the fan can be heard along with air pressure switch operating (no hunting) then i would be checking ignition lead @ board , sometimes these can come adrift , if fan operates then OH stat is working ok (contacts closed) , if fan hunts then i would be checking board , APS or pilot solinoid.
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Someone's fiddled with it, haven't they? 
On looking through a schematic wiring diagram the only thing in the ignition chain so far unchecked seems to be the spark electrode. Is it likely that this could be damaged? The connection from the PCB to this part seems to be sound enough. But I will also check if there is air in the main pump, as suggested. I promise that if I get to the bottom of this mystery I'll happily let you know!
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Thats a new one on me.
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