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It was the fan siezed. Fixed rate repair so ended up expensive for engineer just to oil the fan! Hoped it was PCB or Replacement fan to get my moneys worth! Engineer said not normal oil they use, does anyone know what that stuff is called (he said non flammable!)

seco services does your installers manual give part number or reference for the PCB ? cheers

was this PCB or APS? how do you test APS?

I'll see what sort of fantastic price they cost. thanks for your help. Just read another thread and they had a pcb with LEDS so looks like rare to have original like this!

ah , ok been long weekend! no multimeter here to test at mo, if pressure switch is at fault can this be easily replaced? do the red and white tubes just come away or are they sealed? no gas running through these I take it!!!! Poor design on this boiler as the pressure tubes get...

is installers manual on internet as pdf?

sorry n/c and n you just lost me to be perfectly honest!

then 2 bulbs not lit No. 3 pressure switch proved and No.4 pilot/pcb proved

there are 2 orange lights lit (more little bulbs than LED, how old is this thing!?) one looks to have '12' printed on the pcb next to it. when u turn thermostat on boiler right down and click off just one light remains

i'll have a look, can see and orange one but behind cover so will remove.

top of casing banged, no joy! if fan stuck and I leave it on like have been trying to find fault can it completely knacker fan? is fan accessible under cover to try free it?

not pulled any wires, power ok to boiler there is an orange glow from PCB and thermostat has on/off click and adjustment know (like on older style radios) which turns that LED on/off so appears to be powered up as should be. There is an additional 'hum' to that of pump you can hear but low, when...

OK, so maybe not the controls. Do you know what ignition sequence should be on Gloworm Ultimate? Is the fact the fan not engaging causing problem with ignition or possibly something else before fan engages isn't happening. May have just been coincidence yesterday that it fired when only...

there is a hum from boiler but thought that was the pump noises tranfsferring. When it was working before the usual sequence was pump, then fan then ignite. Seems to be stuck at pump now. when It fired yesterday on HW side only same thing, demand for HW by switching to +1hr, hear pump...

stat on boiler at nearly max (always set at around 80%) room stat up high and cylinder at 70 degress. Did move this to max but still same happens, boiler runs no ignition!?

forgot to mention when pump running for while but no fire on boiler the top of the divertor valve (metal casing on the flowshare 2) got pretty hot even though there was no heat whatsoever in the pipes??? any significance?

no not firing, pump runs, diverter valve seems to do its stuff but no fire when demand for either HW or heat sepertate of both together even the the valve moves the the appropriate side. Would pump still run with faulty actuator?

boiler not tripped re-set is in the on position. what about this ticking/knocking from the pump again seems to come and go? only started after I'd vented through screw on front to ensure no air in there??

pump only runs when demand from programmer for HW,CH or both but boiler does not fire up now. did yesterday but only when demand for HW alone, then switched to demand for CH and both ran but only until cyliner stats satisfied and it all shut down? that's what had me thinking valve?

thanks for quick response! pump is connected into wiring centre. Mid point valve do seem to move across to each side. Pump making ticking noises again having just tried again after being off a while. Seems worst on normal setting 2 and even worse on one but seems to dispappear after a min...