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Mend Glow-worm 24XCI Heating Systems Pressure

why does my glow worm 24xci flash f9?

the pressure is at 1.8 and then the reading changes to a flashing F9 ... why would that be?

Curious
July 2007
Glow-wormGlow-worm 24XCIHeating, Home Heating SystemsHeating Systems Pressure
flashing f9 is a rapid increase in temp picked up by flow + return thermister. can be caused by a faulty pump, pump wrong way round or thermisters incorrectly wire - I'd go with the pump option first

Paul the gas man
July 2007

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