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valliant boiler wont fire up?

boiler tries to start green light then yellow then stops red light and green, f22 shows, filling loop had been left open so reduced to correct preasure but still just tries then stops. any help welcome.

Tony Allen
August 2010
Heating, Home Heating SystemsBoiler Light Red
f22 means no increase in pressure rise in boiler check pump

steve bh heating
September 2010

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Mend Heating, Home Heating Systems
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