https://www.glow-worm.co.uk/trade/service/fault-finding-codes/subsites/betacom-a-range-6-232598.en_gb.html
https://www.emergencyplumber.uk.com/plumbing/f1-fault-on-a-glow-worm-boiler/
http://www.diynot.com/diy/threads/glowworm-30cxi-f1-error-fault-checks-help.206931/
XXX
December 2015