TM 9-4520-272-14&P
0016 00
Table 1. Troubleshooting Procedure for Large Capacity Field Heater (LCFH).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
opening properly, pressure read 0 psi.
23. Heater starts, shuts down,
Step 1. This error code indicates that a
Step 1. Ensure that there is
and displays error code: H121
adequate fuel in the heater. Repair
any damaged or defective fuel hoses
or connections that are leaking fuel.
Turn power switch to OFF. Inspect
engine bay, fuel access, and burner
areas for any signs of fuel loss.
Step 2. Reconnect alternator tach
and ensure that it is not disconnected,
wire if disconnected and tighten
securely. Repair any broken or
broken, or damaged in any way.
damaged alternator tach wire.
Step 3. Check and ensure that the
Step 3. Replace a broken or
alternator belt is not broken or
damaged alternator belt IAW WP
damaged.
Step 4. Check and ensure that flexible
Step 4. Replace a damaged or
broken flexible coupling IAW WP
coupling is not broken or damaged.
Step 1. If starter does not turn during
24. Heater starts, shuts down,
Step 1. This error code indicates that
and displays error code: H122
heater startup, replace starter IAW
detected during engine crank. During
heater startup, determine if diesel
engine starter is turning.
Step 2. Turn power switch to OFF.
Step 2. Repair a damaged or
defective alternator TACH wire.
wire is connected properly and does not
read open when checked with a
Step 3. Replace a broken or
Step 3. Check and ensure that the
alternator belt is not broken or
damaged alternator belt IAW WP
damaged.
Step 4. Replace a damaged or
Step 4. Check and ensure that flexible
broken flexible coupling IAW WP
coupling is not broken or damaged.
25. Heater starts, shuts down,
Step 1. This error code indicates that
Step 1. Check all wires leading to
and displays error code: H561
there is an open circuit detected at the
engine throttle stop solenoid relay driver
00 for location). Reconnect or
repair
K2 inside the relay box assembly (see
any wires or connectors that may be
disconnected or damaged.
OFF. Open engine bay access door and
inspect relay box assembly to ensure
that wiring harness is not damaged and
that the connectors are engaged
securely.
Step 2. Check and ensure that throttle
Step 2. Remove relay box assembly
stop relay driver K2 is operating
properly.
wires are connected to relays.
0016 00-8