As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INVESTIGATED COMPLAINT OF COMBUSTION HEATER NOT OPERATING. DURING TROUBLESHOOTING, FOUND COMBUSTION AIR SWITCH CONTINUITY INTERMITTENTLY CYCLING OPEN AND CLOSED DURING NORMAL OPERATING PRESSURES. SWITCH DATE CODE: 9/02. REPLACED COMBUSTION AIR SWITCH WITH NEW SWITCH, ALSO THERMOSTATIC SWITCH. HEATER OPERATIONS, NORMAL. (K)