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Quick Reference Guide - Page 28
Sensor Temperature Monitoring Function
The sensor sensing temperature is displayed on the remote controller. This function allows you to make sure whether
the sensor is installed properly.
1) Press the TEST + CL buttons for four seconds or more.
2) Select the Code No. with the TEMP. buttons.
3) Press the TEST button to exit the test mode.
Code No. Location Indication
06
Return water temperature °C
08
Hot water temperature °C
09 Hydro unit 2-zone sensor temperature °C
0A
Hot water cylinder temperature sensor °C
0B
Motorized mixing valve position
60
Heat exchanger temperature °C
61
Outside air temperature °C
62 Outdoor unit Refrigerant discharge temperature °C
63
Refrigerant intake temperature °C
6A
Current value (in the inverter) A
70
Compressor operating frequency
F4
Hydro unit AC pump total operating hours x100 hours
F5 Operating hours Hot water cylinder heater total operating hours x100 hours
F6
Hydro unit heater total operating hours x100 hours
Fault Symptoms
Symptom Possible cause Corrective action
Incorrect remote controller setting
Check remote controller operation and temperature
setting
Room is not heated or
Incorrect function code setting
Check function code setting with the function code
table.
Backup heater disconnected Check backup heater and bimetal thermostat.
cooled. Water is not hot
enough.
Insufficient capacity Check selection of equipment.
Sensor defect
Check whether temperature sensor is installed at
the normal position.
Power is not supplied. Check power supply wiring.
Nothing is displayed on
the remote controller.
Incorrect setting
Check DIP switch setting on the Hydro Unit board.
Check the setting with the function code table.
Air bite in the pump Release air completely according to the procedure.
Flow rate switch is
Low hydraulic pressure
Set hydraulic pressure considering pipe height, and
replenish water until manometer shows a value of
set hydraulic pressure or more.
Strainer is clogged. Clean the strainer.
activated. Error code
[A01]
Large resistance on the hydro side
Widen water path to the hydro unit or adopt a
bypass valve.
Malfunction of motorized 3-way
valve for hot water supply
Check wiring and parts.
Excessive hydraulic pressure
Set hydraulic pressure considering pipe height, and
replenish water until manometer shows a value of
set hydraulic pressure or more.
Insufficient capacity of expansion
tank
Check expansion tank capacity compared to total
water amount. If it is insufficient, install another
expansion tank.
Hot water leaks from
pressure relief valve.
Expansion tank failure Check the air pressure.