– 35 –
Hydro Unit
Installation Manual
P03
The outlet temperature error
O
×
1. Check the refrigeration cycle (gas leak).
2. Defect of the pulse motor valve.
3. Check the resistance value of the discharge
temperature sensor (TD).
P04
The high pressure switch error
O
×
1. Almost no or little water flow.
2. Defect of the flow sensor.
3. On-load operation under the above conditions.
4. Defect in the high pressure switch.
5. Failure of a refrigerant value to open.
P05
The power supply voltage error
O
×
1. Check the power supply voltage.
P07
Overheating of heat-sink error
O
×
1. Check the thread fastening and heat-sink grease
between the outdoor control board and the heat-sink.
2. Check the heat-sink fan duct.
3. Check the resistance value of the heat-sink
temperature sensor (TH).
P15
Detection of gas leak
O
×
1. Check the refrigeration cycle (gas leak).
2. Check that the service valve is fully open.
3. Defect of the pulse motor valve.
4. Check for kinked piping.
5. Check the resistance value of the discharge
temperature sensor (TD), the suction temperature
sensor (TS).
6. Check the value of PD sensor by the remote
controller.
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 value of PD sensor by the remote
controller.
6. The water piping is too short.
Install a buffer tank or set the setting temperature
lower.
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.
Check
code
Diagnostic functional operation
Determination and action
Operational cause
Backup
operation
Automatic
reset
Defect mode detected by the remote controller
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
Status of air-
conditioning
Condition
Not
displaying at
all
(cannot
operate by
the remote
controller)
No communication between Hydro
Unit an remote controller
Stop
–
Defect in the remote controller power
supply
1. Check the remote controller wiring.
2. Check the remote controller.
3. Check the Hydro Unit power supply
wiring.
4. Check the water heat exchange
control board.
E01
No communication between Hydro
Unit and remote controller
Stop
(Automatic reset)
Displayed when
the abnormality
is detected.
Defect in the reception of the remote
controller
1. Check the remote controller
crossover.
2. Check the remote controller.
3. Check the hydro power supply wiring.
4. Check the water heat exchanger
board.
E02
Defect in the signal transmission
to the Hydro Unit.
(Detected on the remote controller
side)
Stop
(Automatic reset)
Displayed when
the abnormality
is detected.
Defect in the transmission of the remote
controller
1. Check the transmitter circuit inside the
remote controller.
… Replace the remote controller.
E09
Several remote controller base
units
(Detected on the remote controller
side)
Stop
(The handset
continues)
Displayed when
the abnormality
is detected.
1.2 Check several base units with the
remote controller
… The base unit is only one, and others
are handsets.
Check
code
Diagnostic functional operation
Determination and action
Operational cause
Backup
operation
Automatic
reset
69-EN
70-EN
Summary of Contents for HWT-1101XWHM3W-E
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