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no mains light on puma 80?

puma 80-pilot flame on, no drop in pressure, fuse just changed (3A) but still no mains light. Do I need to take off the second cover & find the boiler switch which i think may be under modulation control board.
I changed the wall thermostat & shut down electrics thats when it happened.
Rio, March 2011
replaced fuse in puma disconnected nuetral, boiler mains is now on & thermostat light is on, but no CH. Was there more tahn one fuse in boiler?

Rio, March 2011
yes remove neutral and make safe replace fuse

bh heating, March 2011
thanks steve do i just disconnect nuetral (blue) from thermostat & replace 3a fuse. Would I need a new T2a have checked it doesnt look blown.

Rio, March 2011
if i remember rightly no neutral conection should be applied to the stat if the load is under 16 amps if a neutral is conected it will blow the fuse on the main pcb every time

steve bh heating, March 2011