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Valliant Gas (Butane) Water Heater won't fire up (yes- pilot on) ?

Heater won't fire up as the pressure 'through' the boiler is restricted/reduced. I've checked the water entry pressure which is fine - however the exit pressure is much reduced. I suspected that the problem lay in the regulation valve. I opened this up checked all the water ways were clear of obstruction etc.. but still to no avail. Any ides what the problem is ?

Allen Shepherd
January 2009
ValliantHeating, Home Heating SystemsWater Heater Boiler Heating
I have got the same problem, have you sorted your's out?, could you tell me how to if you have

Elaine Worth
May 2009

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Valliant Gas Heater Not Firing - Pilot On