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what does f4 mean?

how to restart my boiler

s hill
June 2009
Heating, Home Heating Systems
too little information as too boiler make, model etc.
F4 can be flame failure whilst lit, ie pcb is losing the rectification. could be dirty electrodes , zig igniter, pcb, but with no boiler make....

Andy
July 2009

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Boiler Help: F4 Error & Restart Guide