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 406 of 775

TM 9--2350--311--10

3--8

Change 6

3--4

TROUBLESHOOTING — CONTINUED

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

PERSONNEL HEATER (GLOBAL A20)

12.A NO PERSONNEL HEATER OPERATION, NO FAULT LAMP OPERATION, NO DIAGNOSTIC CODE

DISPLAY

Step 1. Check MS power connection.

Tighten connector.

Step 2. Restart heater.

Step 3. If problem still exists, notify unit maintenance (NO PERSONNEL HEATER OPERATION, NO FAULT

LAMP OPERATION, NO DIAGNOSTIC CODE DISPLAY).

12.B C3, VENT FAN FAULT

Step 1. Check for frost or obstruction in vent fan.

Remove frost or obstruction.

Step 2. Start personnel heater.

Step 3. If problem still exists, notify unit maintenance (C3, VENT FAN FAULT).

12.C E1, LOW VOLTAGE

Step 1. Check for loose cable connection.

Tighten loose cable connection.

Step 2. If problem still exists, notify unit maintenance (E1, LOW VOLTAGE).

12.D E3, LOW BURNER AIR FLOW

Step 1. Check exhaust for restrictions.

Remove restriction from exhaust.

Step 2. Check for combustion air restriction.

Remove combustion air restriction.

Step 3. Restart personnel heater. If problem still exists, notify unit maintenance (E3, LOW BURNER AIR

FLOW).

12.E F1, IGNITION OVERTIME

Step 1. Check fuel supply.

Add fuel if necessary.

Step 2. Restart heater.

Step 3. If problem still exists, notify unit maintenance (F1, IGNITION OVERTIME).