184
TROUBLESHOOTING
2) Engine will not Start
※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
P8 (74-1) error
Starter pinion does not work
Pinion drive coil failure
Refer to P199, 5)Inspect
Starter
Starter unit failure
Starter drive system failure
Transformer failure
Refer to P199, 6)Inspect
Starter Transformer
Starter drive system terminal contact failure
Relay failure
Refer to P200, 7)Operation
Check of Relay
P8 (74-4) error
LF (84) error
Intake and
exhaust air
system
failure
Fuel gas
Fuel gas pressure failure
Refer to P200, 8)Inspect Fuel
Gas Pressure
Electromagnetic
gas valve
operation failure
Electromagnetic gas valve
failure
Refer to P200, 9)Inspect Elec-
tromagnetic Gas Valve
Output failure
Incorrect air/
fuel ratio
Air system
Blockage in the air inlet
Air filter element inspection /
replacement
Clogged air filter element
Fuel system
Engine throttle valve failure
Refer to P210, 16)Inspect En-
gine Throttle Valve / Fuel Gas
Flow Control 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 Ex-
haust 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 ex-
changer or the exhaust muffler
Ignition system failure
Spark plug failure
Refer to P201, 10)Inspect
Spark Plug
Deposit formation or wet plug
Spark plug clearance is off the standard
High voltage cable failure
Refer to P201, 11)Inspect
High Voltage Cable
Igniter, etc. failure
Refer to P202, 12)Inspect Ig-
niter, etc.
Compression system failure
Valve popping
up
Valve clearance failure
Refer to P203, 13)Compres-
sion Inspection
Refer to P204, 14)Valve
Clearance Inspection /
Adjustment
※2
Carbon deposit formation on valve or valve seat
Refer to P205, 15)Treatment
for Compression Failure due
to Carbon Deposit
Noise or other causes
Engine speed sensor reading failure
Refer to P211, 18)Check for
Contact Failure at the Starter
Drive System
Malfunction caused by induction noise from the
ignition system
Refer to P201, 11)Inspect
High Voltage Cable
Too heavy cranking load
Due to low temperature, engine oil is so viscous
that the starter is not able to run the engine.
Refer to P212, 20)Inspect En-
gine Oil Pan Heater
※1
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