190
TROUBLESHOOTING
10) Overheated Refrigerant Discharge Temperature in Cooling Operation
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
F3 (91) error
Heat exchange
at the condenser
(outdoor unit
side) is disturbed.
Outdoor fan motor
operation failure
Obstacle
(contact with other objects)
Clean up obstacle
Outdoor fan motor failure
Refer to P217, 27)Inspect Outdoor
Fan Motor
Output failure
Deteriorated heat
exchange capacity
Clogged heat exchanger fins
/ obstacle
Clean heat exchanger fins
Intake air tempera-
ture is too high
Environmental / installation
conditions are severe
Check and improvement of environ-
mental conditions
Short circuit, etc.
Refrigerant
system failure
Inappropriate refrigerant amount
Refer to P222, 36)Inspect Refrig-
erant Pressure (Inspect Refriger-
ant Amount)
Blockage in the
refrigerant flow path
Blockage in the check valve
Refer to P222, 37)Inspection
Check Valve (Refrigerant Pres-
sure Increase)
Clogged or broken pipe Correct faulty parts
Stop valve operation failure
(not fully opened)
Check if stop valve is fully opened
Blockage in the strainer Refer to P224, 44)Inspect Strainer
Non-condensable gas incorporation into the refriger-
ant system
Replace refrigerant
Hot gas leakage into
the inlet side
Reversing valve leakage
Refer to P227, 49)Inspect Revers-
ing Valve
Sensor/Harness
system failure
Refrigerant high
pressure switch
malfunction
Refrigerant high pressure
switch failure
Refer to P222, 38)Inspect Refrig-
erant High Pressure Switch
Contact failure / disconnec-
tion
Refrigerant high
pressure sensor
operation failure
Refrigerant high pressure
sensor failure
Refer to P223, 39)Inspect Refrig-
erant High Pressure Sensor
Contact failure / disconnec-
tion
Compressor discharge pipe temperature sensor
operation failure
Refer to P227, 50)Check for Read-
ings of the Compressor Dis-
charge Pipe Temperature Sensor
Gas mixer
operation failure
Engine throttle valve failure
Refer to P210, 16)Inspect Engine
Throttle Valve / Fuel Gas Flow
Control Valve
Stuck engine throttle valve
Fuel gas flow control valve failure
Output failure
Compressor
operation failure
Compressor compression failure
Refer to P231, 55)Check Opera-
tion Condition
J3 (78) error
J3 (91) error
Sensor/Harness
system failure
Compressor
discharge pipe
temperature sensor
Disconnection / Short circuit
Refer to P227, 50)Check for Read-
ings of the Compressor Dis-
charge Pipe Temperature Sensor
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