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The HW also failed over the weekend - burner and fan switching on-off whatever flow rate of HW demanded. I replaced the fan control board this AM and the thing kicked into life again and seems to be functioning normally (after a few resets whilst it sorted its issues out). The fault finding...

Much appreciated help, thanks.

I would appreciate some help with a Ravenheat csi85, 2yrs old. The HW works fine but the CH is malfunctioning. On selecting CH the pump and fan run, the burner lights then the fan stops after 5secs and the burner goes out 4secs afterwards. This cycle repeats indefinitely with the burner...