TM 10-4520-262-12&P                                                     0009 00 0009 00-7 Table 1. Operator Troubleshooting Procedures MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION Step 5.  Is combustion air inlet and combustion exhaust pipe clear of snow and other obstructions? Clear combustion air inlet vent openings and exhaust pipe areas of any obstructions. If heater still does not operate or fault code persists, notify Unit Maintenance. 9. Fault Code 5 – Glow Plug Step 1. Remove the upper housing assembly and verify that the wire leading to the glow plug is securely attached and not damaged in any way. Make sure that glow plug connector is securely attached to glow plug. If heater still does not operate or fault code persists, replace glow plug as detailed in WP 0013 00. If heater still does not operate after replacing the glow plug, notify unit maintenance. 10. Fault Code 6 – TEG Over Temperature Step 1.  Has the TEG overheated? This fault is caused by the TEG overheating. Remove the upper housing assembly and inspect the fins on the TEG to ensure that there is no lint, grass, or other debris that would prevent air from flowing freely through the fins.   Check to see if there are any obstructions at the heated air outlet duct and/or the heated air inlet duct restricting free air movement. Remove any obstructions at the heated air outlet or inlet duct.   If problem persists, notify unit maintenance. 11. Fault Code 7 – Over Voltage There is no test or inspection to be performed. This fault is caused by the battery being charged to a higher than rated voltage. Notify unit maintenance and schedule power control assembly replacement.