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Cleaning instructions / Troubleshooting
The following symptoms do not indicate malfunction.
Symptom Cause
Water owing sound during operation. Refrigerant 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 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 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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