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What F4 mean on a Glow Worm Boiler model 18hxi?

WE CAME HOME AND THE HEATING WASNT WORKING,
the boiler wasnt on and had F4 on the panel, my husband restarted it and it worked fine all night but what did F4 mean ? should we have got a plumber ?

Caroline Sheppard
February 2010
Heating, Home Heating SystemsWorm Boiler Model

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