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fault saying noCN optimax he 38 c?

my boiler is showing noCN on right side of clock and nothing on the other. Any help as engineer cannot call till fri so left without hot water and heating

chris fowler
May 2009
Heating, Home Heating SystemsHe 38 C
You need an Engineer, we are all busy so don't get impatient, it will soon be Friday

Boiler Repairman
May 2009

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