English
25
Cleaning instructions /
Troubleshooting
The following symptoms do not indicate malfunction.
Symptom
Cause
Water
fl
owing sound during operation.
•
Refrigerant
fl
ow inside the unit.
Operation is delayed a few minutes
after restarting.
•
The delay is a protection for the compressor.
Outdoor unit emits water/steam.
•
Condensation or evaporation occurring in the pipes.
Steam comes out of the outdoor unit in
the heating mode.
•
It is caused by defrost operation in the heat exchanger.
Outdoor unit does not operate.
•
It is caused by the protection control of the system when outdoor temperature is
out of the operating range.
System operation switches off.
•
It is caused by the protection control of the system. When the water inlet
temperature is lower than 10 °C, the compressor stops and the backup heater
power turns on.
System is hard to heat up.
•
When the panel and the
fl
oor are heated simultaneously, warm water temperature
may decrease, which may reduce the heating ability of the system.
•
When the outdoor air temperature is low, the system may need longer time to heat
up.
•
Discharge outlet or intake inlet in the outdoor unit is blocked by some obstacle,
such as a pile of snow.
•
When the preset water outlet temperature is low, the system may need longer time
to heat up.
System does not heat up instantly.
•
System will take some time to heat up the water if it starts to operate at cold water
temperature.
Backup heater is automatically turned
ON when it is disabled.
•
It is caused by the protection control of the indoor unit heat exchanger.
Operation starts automatically when
the timer is not set.
•
Sterilization timer has been set.
Loud refrigerant noise continues for
several minutes.
•
It is caused by protection control during deice operation at outdoor ambient
temperature lower than -10 °C.
*
1
COOL mode is unavailable
•
System has locked to operate in HEAT mode only.
Check the following before calling for servicing.
Symptom
Check
Operation in HEAT/*
1
COOL mode is
not working ef
fi
ciently.
•
Set the temperature correctly.
•
Close the panel heater/cooler valve.
•
Clear any obstruction in the air inlet and air outlet vents of the outdoor unit.
Noisy during operation.
•
Outdoor unit or indoor unit has been installed at an incline.
•
Close the cover properly.
System does not work.
•
Circuit breaker has tripped/activated.
Operation LED is not lit or nothing is
displayed on the Remote Controller.
•
Power supply is working correctly, or a power failure has occurred.
Troubleshooting
*
1
The system is locked to operate without COOL mode. It can be unlocked only by authorised installers or our authorised service partners.
*
2
Only displayed when COOL mode is unlocked (This means when COOL mode is available).
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