185
TROUBLESHOOTING
3) Engine Starts But Stalls
※1. Unit with drain heater kit only
※2. 8 TON only
For diagnosis and repair, Refer to P306 and after, [Wiring Diagram of the Outdoor Unit] or Refer to P233 and after, [Board Main-
tenance Functions].
Problem Possible Cause Specific Example Inspection and Treatment
LJ (75) error
P8 (74-4)
error
Intake and
exhaust
air sys-
tem failure
Fuel gas
Fuel gas pressure failure
Refer to P200, 8)Inspect Fuel Gas
Pressure
Electromag-
netic gas valve
operation
failure
Electromagnetic gas valve
failure Refer to P200, 9)Inspect Electromag-
netic Gas Valve
Output failure
Incorrect air/
fuel ratio
Air system
Blockage in the air inlet
Air filter element inspection / replace-
ment
Clogged air filter element
Fuel system
Engine throttle valve
failure
Refer to P210, 16)Inspect Engine
Throttle Valve / Fuel Gas Flow Con-
trol Valve
Stuck engine throttle valve
Fuel gas flow control valve
failure
Output failure
Air/fuel ratio failure
Refer to P210, 17)Inspect Air / Fuel
Ratio
Blockage in
the exhaust
system
Blockage in the
exhaust water
drain hose
Freezing in exhaust water
drain hose
Refer to P211, 19)Inspect Exhaust
Water Drain Heater
※1
Broken or twisted exhaust
water drain hose
Inspect / adjust exhaust water drain
hose
Blockage in the exhaust air heat exchanger
or the exhaust muffler
Inspect for exhaust air heat exchanger
or the exhaust muffler
Ignition system failure
Spark plug failure
Refer to P201, 10)Inspect Spark PlugDeposit formation or wet plug
Spark plug clearance is off the standard
High voltage cable failure
Refer to P201, 11)Inspect High Volt-
age Cable
Ignition timing failure
Refer to P213, 21)Check Ignition
Timing
※2
Igniter, etc. failure Refer to P202, 12)Inspect Igniter, etc.
Compression system
failure
Valve popping
up
Valve clearance failure
Refer to P203, 13)Compression In-
spection
Refer to P204, 14)Valve Clearance In-
spection / Adjustment
※2
Carbon deposit formation on valve or valve
seat
Refer to P205, 15)Treatment for Com-
pression Failure due to Carbon De-
posit
Noise or other causes
Engine speed sensor reading failure
Refer to P211, 18)Check for Contact
Failure at the Starter Drive System
Starter drive system terminal contact failure
Malfunction caused by induction noise from
the ignition system
Refer to P201, 11)Inspect High Volt-
age Cable
LE (75-10)
error
Starter drive system
failure
Transformer failure
Refer to P199, 6)Inspect Starter
Transformer
Starter drive system terminal contact failure
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