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Mend Ferroli Optimax 31c Boiler Heating Error Code

Ferroli Optimax 31c?

Our boiler has a "no cn" symbol appearing on the clock counter and won't turn on. There is gas within the house. Leaflet doesn't cover that code. Can anyone tell me what the code stands for, or how to get the boiler get back on?

Gillian
September 2010
FerroliFerroli Optimax 31cHeating, Home Heating SystemsBoiler Heating Error Code

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Mend repair fix Ferroli Optimax 31c home heating systems