Owner’s Manual -
B-VMH09,12,18,24DU-1
12
Problem
Possible Causes
Dust is emitted from
either the indoor or
outdoor unit
The unit may accumulate dust during extended periods of non-use, which
will be emitted when the unit is turned on. This can be mitigated by covering
the unit during long periods of inactivity.
The unit emits a
bad odor
The unit may absorb odors from the environment (such as furniture, cooking,
cigarettes, etc.) which will be emitted during operations.
The unit’s filters have become moldy and should be cleaned.
The fan of the
outdoor unit
does not operate
During operation, the fan speed is controlled to optimize product operation.
Troubleshooting Tips
When troubles occur, please check the following points before contacting a repair company.
Problem
Possible Causes
Solution
The unit
is not
working
Power failure
Wait for the power to be restored
The power switch is off
Turn on the power
The fuse is burned out
Replace the fuse
Remote control batteries are dead
Replace the remote control batteries
The unit’s 3-minute protection has
been activated
Wait three minutes after restarting the unit
Poor cooling
performance
Temperature setting may be higher
than the ambient room temperature Lower the temperature setting
The heat exchanger on the indoor
or outdoor unit is dirty
Clean the affected heat exchanger
The air filter is dirty
Remove the filter and clean it according
to instructions
The air inlet or outlet of either unit
is blocked
Turn the unit off, remove the obstruction
and turn it back on
Doors and windows are open
Make sure that all doors and windows are
closed while operating the unit
Excessive heat is generated by
sunlight
Close windows and curtains during
periods of high heat or bright sunshine
Low refrigerant due to leak or
long-term use
Check for leaks, re-seal if necessary and
top off refrigerant
The unit
starts and
stops
frequently
There’s too much or too little
refrigerant in the system
Check for leaks and recharge the system
with refrigerant
There is air, incompressible gas or
foreign material in the refrigeration
system.
Evacuate and recharge the system with
refrigerant
System circuit is blocked
Determine which circuit is blocked and replace
the malfunctioning piece of equipment
The compressor is broken
Replace the compressor
The voltage is too high or too low
Install a manostat to regulate the voltage
Poor heating
performance
The outdoor temperature is lower
than 7°C (44.5°F)
Check for leaks and recharge the system
with refrigerant
Cold air is entering through doors
and windows
Make sure that all doors and windows are
closed during use
Low refrigerant due to leak or
long-term use
Check for leaks, re-seal if necessary and
top off refrigerant
