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Hydro Unit
Installation Manual
P19
The 4-way valve inversion error
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).
P20
High pressure protection 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).
6. Check the value of PD sensor by the remote
controller.
P22
Outdoor fan system error
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.
P26
Short circuit of the compressor
driver element error
O
×
1. Abnormality occurs when operating with the
compressor wiring disconnected … Check the
control board.
2. No abnormality occurs when operating with the
compressor wiring disconnected … Compressor rare
short.
P29
Compressor rotor position error
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.
Check
code
Diagnostic functional operation
Determination and action
Operational cause
Backup
present
Automatic
reset
44-EN
Summary of Contents for HFC series
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