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Posted by Honorius on October 22, 2006 at 17:52:21:
The problem appeared first for CH, now appears also for DHW.
When starting to heat up CH, it works fine for a period, with maximum modulated flame, then it seems to shut off gas valve. The fan still works for a period of time, then stops; after, the fan starts again and after 10s (not instantly) the flame appears. Then it continues to shut-off and restart until, at a certain restart (the 20th or so) the flame gets minimum modulation - now it continues to work fine, with no interruptions, until the CH goes off - because of the room thermostat that shuts off the boiler).
Now, the maintenance personnel changed the overheating thermistor, changed the PCB and the problem still persits ! The boiler has 2 years old.
It drives me nuts, with so many restarts. Also, the gas valve is very noisy when coupling on.
Hope somebody has some ideas. Where can I buy Ferroli parts (i.e. the gas valve) ?
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