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Mend Ferroli Home Heating Systems

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Mend Ferroli Optimax 31c

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
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Find out how to mend Ferroli home heating systems