TM 9-4520-272-14&P
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Table 1. Troubleshooting Procedure for Large Capacity Field Heater (LCFH).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
50. Heater starts, shuts down,
Step 1. This error code indicates that a
Step 1. Repair a shorted wire to the
and displays error code: H632
short circuit has been detected at fuel
fuel solenoid valve FS3.
internal/external fuel supply). Turn
Step 2. Replace a defective FS3 fuel
power switch to OFF. Check wire on
it is not shorted to ground.
51. Heater starts, shuts down,
Step 1. This error code indicates that an
Step 1. Replace a defective main
and displays error code: H251
open circuit has been detected at spark
ignition transformer relay T1. This is
caused by a defective main control
board.
52. Heater starts, shuts down,
Step 1. This error code indicates that a
Step 1. Turn power switch to OFF.
and displays error code: H252
short circuit has been detected at spark
Replace a defective main control
ignition transformer relay T1. This is
caused by a defective main control
board.
53. Heater starts, shuts down,
Step 1. This error code indicates that
Step 1. Cycle the on/off switch on
and displays error code: H801
there has been a watchdog (COP)
the operator control panel to
timeout indicating a loss of software
determine if problem has been
control for greater than 1 second.
resolved.
Step 2. Turn power switch to OFF.
Replace a defective main control
Step 1. Repair any tears in the
54. Heater starts, shuts down,
Step 1. This fault code indicates that the
and displays fault code: H311
flexible air inlet duct with duct tape.
LCFH has detected carbon monoxide at
Replace flexible air duct if damage
the operator control panel. Evacuate
cannot be completely repaired with
any personnel that may be in the shelter
duct tape.
and look for signs of carbon monoxide
poisoning. Check the flexible air inlet
duct and ensure that it does not have
any rips, tears, or other damage that
would allow combustion exhaust to
enter the inlet air flow.
Step 2. Attach flexible air inlet duct
Step 2. Check and ensure that the
to air inlet duct adapter lock in place
flexible inlet air duct is securely
securely.
attached to the air inlet duct adapter on
the LCFH.
Step 3. Move LCFH so that
Step 3. Ensure that the shelter opening
is not downwind of the LCFH is such a
shelter during LCFH operation.
way as to allow combustion exhaust to
enter the shelter.
Step 4. Move sources of carbon
Step 4. Determine if there are any other
monoxide a safe distance away from
sources of carbon monoxide (vehicles,
the shelter and the LCFH.
Step 5. If problem reoccurs and
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