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Mend Keston CMB Error Red Display

what does e05 on a keston boiler mean??

what does it mean when the error code E05 flashes red on a keston boiler display?

alec
January 2011
KestonKeston CMBHeating, Home Heating SystemsError Red Display
Fan failure - boiler cannot detect fan rotation. Check fan operation and BOTH connectors onto fan.

mary
March 2011
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