Alarm code
Content
Possible cause
F101
The high-pressure switch (HPS) Discharge pressure regulation valve is defective.
activates within 30 seconds
Check valve is blocked.
after the compressor start or
Lead wire of the high-pressure switch is broken.
the protection devices activates High-pressure switch contact is defective.
five times at unit start-up.
High-pressure switch is defective.
Condenser fan motor is in abnormal stop.
Printed-circuit board malfunction.
F109
Low pressure lowers abnormally
Liquid solenoid valve coil is broken.
within 2 seconds after
Low-pressure transducer (LPT) value is abnormal.
CPU board is faulty.
compressor started.
The low-pressure transducer is faulty.
F111
High-pressure switch (HPS)
High-pressure switch lead wire is broken.
does not activate at set value.
High-pressure transducer lead wire is broken.
F301
Temperature setting request
Set point temperature is not set.
Failure of SRAM (on CPU board)
F401
In the chilled or partial frozen
Short circuit or breakage of both sensor lead wires
F403
mode, the supply air sensor
Wrong wiring connection on both sensors
(SS) and return air sensor (RS) Both sensors defective
is defective.
CPU board malfunction
F603
The suction modulating valve does not
Suction modulating valve coil is broken.
fully close although it is set to be full-close.
Suction modulating valve malfunctions.
F701
Abnormal power voltage Note) 1.
The voltage is too high.
S phase is open.
Power supply waveform is not sinusoidal.
F705
S phase is open phase
The voltage selector is in poor contact.
The circuit breaker is in poor contact.
Power plug is in poor contact.
Power cable is broken
Open phase of power supply
F803
Any following malfunction
Refer to the possible cause of the left mentioned malfunction codes.
codes are counted 10 times
E101
E103
E107
E109
E203
E707
E101
High-pressure switch (HPS)
Refrigerant is overcharged
activated during operation.
Wrong refrigerant is charged. (i.e. HCFC22)
Air entered in the refrigerant system
Insufficient air flow rate
Fins are blocked
Air passage is blocked by some foreign materials
Short circuit of condenser cooling air
Wrong installation of condenser fan
Condenser fan rotates reverse.
Condenser fan breakage.
Condenser fan fell out.
Ambient temperature is abnormally high
Condenser fan motor running
Motor stops due to
Blocked finned coil.
is abnormal
thermal protector
Air passage is blocked by some foreign materials
actuation.
Wiring lead breakage
Motor does not run
Wrong wiring
Water-cooled condenser
Shortage of cooling-water
capacity is decreased
Cooling-water temperature high.
Blocked with scale
HPS malfunction
Wiring lead breakage
Poor connection with terminal block board
Wrong wiring of high pressure switch
CPU board malfunction
Power I/O board malfunction
E103
Electronic overcurrent protection Compressor lock
device (electronic OC) actuates.
CPU board malfunction
Power I/O board malfunction
PT/CT board malfunction
6-5
6.2 Alarm codes on electronic controller
If any alarm occurs, search its cause and repair it referring to the following table.
Be sure to check the connectors in the electronic controller as the poor contact of them may cause the
controller alarm codes.
Note1: If S phase is open, F701 may occur. When F701 and F705 are displayed together, inspect the S
phase for opening.
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