What was found
(CAN) DURING CLIMB, THE ACFT WAS APPROACHING CLOUD. DUE TO EXCESSIVE CLOUD COVER THE ICE PROTECTION WAS SELECTED ON EARLY AT APPROX +7C. A SHORT TIME AFTER SELECTING THE ENGINE INTAKE BYPASS DOORS, THE END ADPT HEAT 1 CAUTION LIGHT ILLUMINATED. THE QRH ITEMS WERE COMPLETED, RESULTING IN THE ACFT REMAINING CLEAR OF ICING CONDITIONS. ONCE THE ENGINE INTAKE BYPASS DOOR WERE DESELECTED, THE CAUTION LIGHT WENT OUT. ANOTHER ATTEMPT AT RE-SELECTING THE BYPASS DOORS WAS MADE, RESULTING IN THE SAME OUTCOME. FURTHER INVESTIGATION FOUND THAT THE ASSOCIATED CIRCUIT BREAKER HAD POPPED. LINE MAINTENANCE INVESTIGATION REVEALED AN OVERHEATING FAILURE OF THE HEATER ADAPTOR HEATING ELEMENT. INTAKE HEATER REPLACED & FOLLOWING APPROPRIATE GROUND CHECKS IAW THE AMM THE ACFT WAS RETURNED TO SERVICE WITHOUT FURTHER INCIDENT. THE REMOVED HEATER ADAPTOR HAS BEEN RETURNED TO THE MFG FOR ASSESSMENT AND REPAIR.