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It wouldnt relight even when pressing the microswitches back in

I manually pushed the top microswitch in just to make sure and it did fire but I let the switch go and it wouldnt relight

Ive opened the vent in the pump, anyone know where I can get a manual for this boiler

Also if the boiler/system was airlocked it would still run until it started to overheat

Boiler was drained down throught the PRV, not ideal I know and air vent was opened on refill, the diverter valve pushes out on DHW and goes back in on heating demand, ive also manually pushed it fully in but still wont light

pipework alterations

You could also fit 2 smaller rads on each wall and pipe them together, maybe not as good too look at though

your expansion vessel may be burst or need repressurised, this would result in water coming out your pressure relief valve though, check too see if water comes out off the air valve at the top off the expansion vessel

It had been working on heating until it was drained, ive checked the high limit stat incase it had cut in

Boiler isnt working on central heating but is on hot water although its not very warm, any ideas what could be the cause