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Check Code
Abnormal point and detection method
Interface unit/Flow temp. controller-
outdoor unit communication error
(Transmitting error) (Outdoor unit)
(1) Abnormal if "0" receiving is detected 30
times continuously though outdoor con-
troller circuit board has transmitted "1".
E9
(2) Abnormal if outdoor controller circuit
board could not find blank of transmis-
sion path for 3 minutes.
Non defined check code
This code is displayed when non defined
check code is received.
EF
Serial communication error
Abnormal if serial communication between
outdoor controller circuit board and out-
door power circuit board is defective.
Ed
Freezing/overheating protection is working
(1) Freezing protection
<Cooling mode>
Abnormal if plate heat exchanger pipe
temperature (TH6) stays at −5: or
lower for 10 seconds or abnormal if
plate heat exchanger pipe thermistor
(TH6) stays at −2: or lower and com-
pressor operation frequency is minimum
for 5 minutes after compressor starts
operating for 6 minutes.
P6
<Heating mode>
Abnormal if inlet water temperature
thermistor (TH32) is 15: or lower,
and the following condition (1 or 2) are
detected.
1. 1 minute has passed since defrost-
ing operation started and plate heat
exchanger pipe temperature thermis-
tor (TH6) stays at −6: or lower for
continuously 30 seconds.
2. During defrosting operation and plate
heat exchanger pipe temperature
thermistor (TH6) stays at −16: or
lower for continuously 10 seconds.
OCH562D
Cause
1 Interface unit/Flow temp.
controller-outdoor unit connecting
wire has contact failure.
2 Defective communication circuit
of outdoor controller circuit board
3 Noise has entered power supply.
4 Noise has entered Interface
unit/Flow temp. controller-
outdoor unit connecting wire.
1 Noise has entered transmis-
sion wire of remote controller.
2 Noise has entered Interface
unit/Flow temp. controller-
outdoor unit connecting wire.
1 Wire disconnection or contact
failure of connector CN2
between the outdoor controller
circuit board and the outdoor
power circuit board
2 Wire disconnection or contact
failure of connector CN4
between the outdoor controller
circuit board and the outdoor
power circuit board
3 Defective communication cir-
cuit of outdoor power circuit
board
4 Defective communication cir-
cuit of outdoor controller circuit
board for outdoor power circuit
board
(1) Freezing protection
<Cooling mode>
1 Reduced water flow
· Clogged filter
· Leakage of water
2 Low temperature
· Low-load
· Inlet water is too cold.
3 Defective water pump
4 Defective outdoor fan control
5 Overcharge of refrigerant
6 Defective refrigerant circuit
(clogs)
7 Malfunction of linear expan-
sion valve
<Heating mode>
1 Reduced water flow
· Clogged filter
· Leakage of water
2 Low temperature
· Low-load
· Inlet water is cold.
3 Defective water pump
4 Leakage or shortage of refrig-
erant
5 Malfunction of linear expan-
sion valve
24
Judgment and action
1 Check disconnection or looseness of
Interface unit/Flow temp. controller-outdoor
unit connecting wire.
2–4 Turn the power off, and on again to
check. Replace outdoor controller circuit
board if abnormality is displayed again.
12 Turn the power off, and on again to check.
Replace Interface/Flow temp. controller
board or outdoor controller circuit board if
abnormality is displayed again.
12 Check connection of each connector CN2
and CN4 between the outdoor controller
circuit board and the outdoor power circuit
board.
3 Replace outdoor power circuit board.
4 Replace outdoor controller circuit board.
(1) Freezing protection
<Cooling mode>
12 Check water piping.
3 Check water pump.
4 Check outdoor fan motor.
5–7 Check operating condition of refrigerant
circuit.
7 Check linear expansion valve.
<Heating mode>
12 Check water piping.
3 Check water pump.
4 Correct to proper amount of refrigerant.
5 Check linear expansion valve. Refer to "8-5.
HOW TO CHECK THE COMPONENTS".
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