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I have a 30cx glowwarm that is showing F4 as fault.I have no hot water?

I have a 30cx Glow worm boiler suddenly started to give cold water only. I don.t know how to fix it? I switched the mains off and on. The boiler starts and restarts but then the error
F4 comes up. Can you guide please?
Sheri, June 2019
home Fix label Heating label_important Home Heating Systemsdone
https://job-prices.co.uk/glow-worm-flexicom-fault/

http://www.boilererror.co.uk/errors.php?merk=7&ketel=90&storing=1584&subcode=0

https://www.diynot.com/diy/threads/glow-worm-flexicom-30cx-error-code-f4.207734/

Shhshh, June 2019

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