I have a Ravenheat CSI Primary A condensing boiler it goes through the start proccess main burner comes in for 5-6 seconds then the boiler switchs off I have replaced the overheat stat and the airflow switch but the boiler is still the same.
Check for decent earth connection to the boiler and correct polarity between L & N.
Check lead for ignition/rectification in good condition and not 'trapped'.
Also check the condense waste system is clear.
Carefree
July 2010
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