191
TROUBLESHOOTING
11) Overheated Refrigerant Discharge Temperature in Heating Operation
For diagnosis and repair, Refer to P306 and after, [Wiring Diagram of the Outdoor Unit]
Problem Possible Cause Specific Example Inspection and Treatment
F3 (91) error
Heat exchange
at the condenser
(indoor unit) is
disturbed.
Indoor fan motor
operation failure
Obstacle
(contact with other objects)
Clean up obstacle
Indoor fan motor failure
Refer to P224, 41)Inspect Indoor
Fan Motor
Indoor fan capacitor failure
Output failure
Deteriorated heat
exchange capacity
(air flow is blocked)
Clogged heat exchanger fins /
obstacle
Clean heat exchanger fins
Dust or dirt on the air filters Clean air filters
Intake air temperature is
too high
Environmental 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 refrigerant
system
Replace refrigerant
Indoor electronic
expansion valve
operation failure
(Valve does not open)
Blockage in the indoor
electronic expansion valve
Refer to P224, 42)Inspect for
Blockage in the Indoor Electronic
Expansion Valve
Hot gas bypass valve
operation failure
Hot gas bypass valve operation
failure (Valve does not open)
Refer to P223, 40)Inspect Hot Gas
Bypass Valve
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 / disconnection
Refrigerant high
pressure sensor
operation failure
Refrigerant high pressure
sensor failure
Refer to P223, 39)Inspect Refrig-
erant High Pressure Sensor
Contact failure / disconnection
Compressor discharge pipe temperature sensor 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
Compression failure of the compressor
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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