TM-9-2350-311-10

HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5

TECHNICAL MANUAL; OPERATOR’S MANUAL

NOVEMBER 1994

TM-9-2350-311-10 - Page 407 of 775

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).