ariston microcombi 23 mffi

Joined
2 Jan 2010
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Location
Yorkshire
Country
United Kingdom
Hi, not done much on these before, just wondered if anyone had experienced the same problems. Boiler is giving luke warm dhw and poor performane on ch. Pump, fan, aps, sensors appear fine but the flame is modulating almost on/off constantly, the flame doesnt actually disappear but you can see it going up/down and the spark electrodes are almost constantly sparking. I am suspecting pcb but just wondered ?
 
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