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F5 flashing on my boiler?

I have the red light flashing on the boiler with the F5 symbol. Can anyone tell me where the reset button is on the 18hxi glow worm. I have taken the front off the boiler. Can anyone please please help

Francesca
March 2011
Heating, Home Heating SystemsRed Light Glow
F5 is the overheat code first check and adjust boiler pressure if req. then turn right hand control knob to 0 and wait 5 sec. then turn to 1

brian
March 2011

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