TM-9-2350-311-10 M109 Operator's Manual for M109A2, M109A3, M109A4 and M109A5 Download
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TM 9--2350--311--10 Change 6 3--8.1 3--4 TROUBLESHOOTING — CONTINUED MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 12.F F2, BURNER FLAMEOUT Step 1. Check fuel supply. Add fuel if necessary. Step 2. Restart heater. Step 3. If problem still exists, notify unit maintenance (F2, BURNER FLAMEOUT). 12.G F3, HEAT LIMIT Step 1. Check for obstructed heater outlet. Remove outlet obstruction. Step 2. Restart heater. Step 3. If problem still exists, notify unit maintenance (F3, HEAT LIMIT). 12.H F4, VENT AIR OVERHEAT Step 1. Check for obstructed heater output ventilation. Remove obstruction. Step 2. Restart heater. Step 3. If problem still exists, notify unit maintenance (F4, VENT AIR OVERHEAT). 12.I F6, INLET OVERHEAT, VEHICLE AMBIENT TEMPERATURE IS ABOVE 131° F (55° C) Step 1. Wait until the temperature is below 131° F. F6 display code will be cancelled when vehicle temperature is below 104° F. Step 2. Manually purge the heater three (3) times. Step 3. Restart heater. Step 4. If problem still exists, notify unit maintenance (F6, INLET OVERHEAT, VEHICLE AMBIENT TEMPERATURE IS ABOVE 131° F (55° C)). 12.J F7, EXHAUST OVERHEAT Step 1. Check for obstruction in air inlet or exhaust. Step 2. Remove obstruction. Step 3. Restart heater. Step 4. If problem still exists, notify unit maintenance (F7, EXHAUST OVERHEAT).