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Diagnostic functional operation
Check
code
Operational cause
Operation of case thermostat
When the case thermostat exceeds
125 °C.
H04
Unset service PC board jumper
L10
Jumpers J800-J803 have not been cut.
Combination error
L15
Model name of the Hydro unit is
different.
The communication between the
outdoor PC board MUCs error
L29
No communication signal between IPDU
and CDB.
The outlet temperature error
When the discharge temperature sensor
P03
(TD) exceeds 111 °C.
The high pressure switch error
P04
The power supply voltage error
P05
When the power supply voltage is
extremely high or low.
Overheating of heat-sink error
When the heat-sink exceeds 105 °C.
P07
Detection of gas leak
When the discharge temperature sensor
(TD) exceeds 106 °C for consecutive 10
min.
When the suction temperature sensor
(TS) exceeds 60 °C for cooling or 40 °C
P15
for heating for 10 consecutive min.
When TG
TC -10 K is detected and
≤
TG
TWI-15 K is detected 10min. (hot
≤
water supply, heating)
When TG
TE -12 K is detected for
≤
10min. (cooling)
Determination and action
Backup
Automatic
operation
reset
1. Check the refrigeration cycle (gas
leak).
2. Check the case thermostat and
connector.
×
O
3. Check that the service valve is fully
open.
4. Defect of the pulse motor valve.
5. Check for kinked piping.
×
O
1. Cut J800-J803.
1. Check the model name of the Hydro
×
×
unit.
2. Check DP_SW13_4 is set to "ON".
×
O
1. Replace the outdoor control board.
1. Check the refrigeration cycle (gas
leak).
×
O
2. Defect of the pulse motor valve.
3. Check the resistance value of the
discharge temperature sensor (TD).
1. Almost no or little water flow.
2. Defect of the flow switch.
×
O
3. Defect in the high pressure switch.
4. Failure of a refrigerant valve to open.
1. Check the power supply voltage.
×
O
(AC220-230 V±10%).
1. Check the thread fastening and
heat-sink grease between the
outdoor control board and the heat-
×
sink.
O
2. Check the heat-sink fan duct.
3. Check the resistance value of the
heat-sink temperature sensor (TH).
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.
×
O
5. Check the resistance value of the
discharge temperature sensor (TD)
and the suction temperature sensor
(TS).
6. Check the PD sensor by remote
controller.
90
Number of
abnormalities
Detailed
for
item
confirmation
10
115
1
115
1
116
1
116
4
117
10
118
8
119
4
119
8
120
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