TM9-2320-361-34 Table 2-1. Mechanical Troubleshooting (Contd). MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 73. 74. 75. 76. 77. 78. WINTERIZATION KITS NOTE Mechanical troubleshooting for personnel and engine coolant heaters are the same. The following is for fuel burning personnel heaters. HEATER FAILS TO TURN ON Bench test for defective control parts (para. 17-19 or 17-20). If defective, replace control parts (paras. 17-2 through 17-18, as necessary). END OF TESTING! HEATER OVERHEATS - OVERHEAT SWITCH IS GOOD Step 1. Step 2. Check for obstructed air flow. If obstructed, clear obstructions from fuel supply air and ventilating air passages (para. 17-8 or 17-14). Check fuel control valve (para. 17-19 or 17-20). Replace fuel control valve if defective (para. 17-6 or 17-12). END OF TESTING! HEATER OVERHEATS - CONTINUES TO RUN Test overheat switch (para. 17-19 or 17-20). Replace overheat switch if defective (para. 17-7 or 17-17). END OF TESTING! HEATER OUTPUT TOO LOW Step 1. Check for obstructed fuel lines or contaminated fuel supply. a. If obstructed, clear fuel supply lines (para. 17-8 or 17-14 for internal fuel supply and TM 9-2320-361-20 for external fuel supply). b. Drain fuel control valve (para. 17-19 or 17-20). Replace fuel control valve if defective (para. 17-6 or 17-12). Step 2. Check fuel control valve (para. 17-19 or 17-20). Replace fuel control valve if defective (para. 17-6 or 17-12). END OF TESTING! HEATER SMOKES AND BANGS WHEN STARTING Perform malfunction 76, step 2. END OF TESTING! BLOWER WILL NOT STOP AFTER TURN OFF Check flame detector switch condition (para. 17-19 or 17-20). Replace flame detector switch if defective (para. 17-2 or 17-15). END OF TESTING! 2-31