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Mend Ferroli Modena 80 MS03 Central Heating Changed

How can I fix my Ferroli Modena 80, MS03?

Central heating not working. Engineer changed gas value, then PC board and still not working. Has anybody experienced this kind of fault and how was it recitifed.

j
April 2009

Ferroli Ferroli Modena 80 MS03 Heating, Home Heating Systems Central Heating Changed

It's most likely either a faulty clock, room stat (if fitted) or a CH sensor.
If the demand light comes on but boiler won't light then suspect a faulty CH sensor.

M
April 2009

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Ferroli Modena 80 MS03 - Heating Fault