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Troubleshooting
When the following symptoms are found, check the points described below before asking repair servicing.
Abnormal phenomenon
Cause
N
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Outdoor unit
• There is white misty cold air
or water on the outside.
• Fans of the outdoor unit automatically stop and the defrosting operation is
performed.
• Sometimes a air leak is
heard.
• The solenoid valve operates when the defrosting operation begins or ends.
Hot water
module
• Sometimes rustling sound
is heard.
• When operation has started, or during operation, or after operation has
stopped, sounds such as water flow can be heard, and the sound may
become louder immediately 2 or 3 minutes after operation has started.
These sounds are either the refrigerant flowing sound or the drainage
sound of the dehumidifier.
• “
” icon lights up
• When heating operation cannot be performed because another indoor unit
performs cooling operation. (Heat pump)
• Does the outdoor temperature exceed the operating temperature range?
• “
” icon lights up
• It performs the opposite operation to the set operation when air conditioner
or hot water module manager has fixed the operation to cooling or heating.
• Sound is output from the
bracket via the hot water
module.
• Oil or refrigerant may be trapped due to temporary refrigerant flow and the
sound of refrigerant flow may be heard when the hot water module is
operating in heating mode.
Pump,
line heater
• The pump and the line
heater operate
automatically during the hot
water module standby.
• When the water temperature drops or the outdoor unit starts running or the
refrigerant (oil) returns to control, the pump and the line heater operate to
protect the water heat exchanger from frost.
• Ticking sound is heard
when the hot water module
is powered on.
• When the power is on, sound is heard when the expansion valve is
running.
• LCD blurs when it is
touched.
• LCD may be temporarily blurred due to static electricity.
Ne
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in
Operates or stops automatically.
• Is the timer ON or OFF?
Not operating.
• Is it a power failure?
• Is the power switch OFF?
• Is the power supply fuse or circuit breaker blown?
• Has the protective device been operating? (Operation indicator is always
on.)
• Is the timer ON? (Operation indicator is always on.)
• Are cooling and heating selected at the same time?
(The“
” icon lights up on the display of the remote controller.)
(Heat pump)
• Does the outside air temperature exceed the operating temperature
range? The operation stops automatically (the “
” on the display of the
remote controller appears).
• Does the water temperature at the inlet of hot water module become low?
If the water temperature at the inlet of hot water module is low, hot water
module may sometimes stop to prevent freezing.
Is water temperature not enough?
• Is the water supply or drainage in water pipes blocked?
• Is the temperature on the display of the remote controller appropriate?
• Does the outdoor temperature exceed the operating temperature range?
• Do the indoor unit and the hot water module operate in heating mode at
the same time?
If the total operating load is too large, it may be difficult to fully heat up the
water.
CAUTION
If any of the following conditions occur, turn off the main power supply switch and immediately contact the dealer:
• Switch operation does not work properly.
• The main power fuse often blows out, or the circuit breaker is often activated.
• A foreign matter or water fall inside the hot water module.
• When the hot water module does not operate even after the cause of the protective device activation has been
removed.
• Any other unusual conditions are observed.
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