60
Check
code
Diagnostic functional operation
Determination and action
Defect
frequency
confirmation
Operational cause
Backup
present
Automatic
reset
P19
The 4-way valve inversion error
When the heat exchange temperature sensor
(TE) exceeds 30°C or the suction
temperature sensor (TS) exceeds 50°C
during the heat pump operation.
O
×
1. Check the operation of the 4-
way valve unit or the coil
characteristics.
2. Defect of the pulse motor
valve.
3. Check the resistance value of
the heat exchange temperature
sensor (TE) and the suction
temperature sensor (TS).
4
P20
High pressure protection operation
When an abnormal stop occurs due to the
high pressure release control. When the heat
exchange temperature sensor (TL) detects
63°C during the cooling operation. When the
water outlet sensor (TWO) detects 60°C
during the heating or hot water supply
operation.
O
×
1. Check that the service valve
is fully open.
2. Defect of the pulse motor
valve.
3. Check the outdoor fan system
(including clogging).
4. Over-filling of refrigerant.
5. Check the resistance value of
the heat exchange temperature
sensor (TL) and the water outlet
temperature sensor (TWO).
10
P22
Outdoor fan system error
When a DC fan rotor position detection NG,
element short circuit, loss of synchronization,
or abnormal motor current occurs.
O
×
1. Check the lock status of the
motor fan.
2. Check the connection of the
fan motor cable connector.
3. Check the power supply
voltage (AC230 V±23 V).
1-4
P26
Short circuit of the compressor driver
element error
When an abnormal short circuit of IGBT is
detected.
O
×
1. P26 abnormality occurs when
operating with the compressor
wiring disconnected … Check
the control board.
2. No abnormality occurs when
operating with the compressor
wiring discon
nected …
Compressor rare short.
8
P29
Compressor rotor position error
The rotor position in the compressor cannot
be detected.
O
×
1. Even if the connection lead
wire of the compressor is
disconnected, it stops due to an
abnormality in the position
detection … Replace the
inverter control board.
2. Check the wire wound resistor
of the compressor. Short circuit
… Replace the compressor.
8