29
Troubleshooting
Refer to
for solutions to common problems and to
for a list of error codes.
Table 3.
Solutions to common problems
Problem
Solution
The unit does not operate immediately after restarting it.
The anti-short cycle timer prevents the unit from operating immediately to keep
it from overloading. The unit will start in 3 minutes.
The unit does not operate.
Verify the following:
There has not been a power failure.
The circuit breaker is switched on/fuses are good.
The temperature does not change.
Verify that the unit is not operating in Fan mode. If it is, select a different mode.
The unit is not producing warm/cool air.
Verify the following:
Temperature setting on remote control is higher/lower than the current
temperature.
Air filter is not clogged with dirt.
If the unit has just been turned on, wait 3 minutes for the anti-short cycle timer
to expire.
Air flow is unobstructed.
Line size and length is correct and does not exceed factory recommendations.
Operating mode is heat/cool.
If unit is not producing warm air, is it set to Cool mode?
Remote control is not for a cooling-only unit.
That the unit has not been installed in direct sunlight. If so, hang curtains or
shades on windows to filter the sun and increase unit efficiency.
The fan speed does not change.
Verify that Auto or Dry mode is selected. Either of these modes automatically
adjust the fan speed.
Timer function does not work.
Press the Power button on the remote control after setting the time.
Odors permeate the room during operation.
Verify the origin of the odor. Operate the unit in Fan mode or open the windows
to air out the room.
The unit makes a bubbling sound
A bubbling sound may be heard when the refrigerant is circulating through the
indoor unit during certain system operating conditions, which should normally be
of short duration.
The remote control is not working.
Verify that:
Batteries are not depleted.
Batteries are correctly installed.
Nothing is blocking the remote control sensor.
No strong fluorescent or neon lighting is near the unit, which may interrupt the
signal.
The unit does not turn on/off with the wired remote control.
Ensure that the wired remote control is not set for Group Control.
Indicators on the digital display flash.
Press the Power button on the remote control to turn the unit off. Then switch the
circuit break off and then on again.
Table 4.
Error codes for the C-series 4-way cassette indoor unit
Error
code
Explanation
Remarks
416
Compressor down due to protection control of the discharge temperature sensor
Outdoor unit protection control
450
Error due to condenser temperature sensor when in cooling mode
451
Error of the low pressure switch (Protection control)
425
Reverse phase error (Protection control)
551
In removing frost
221
Error of outdoor temperature sensor (Open/Short)
Outdoor unit sensor error(Open/ Short) Detection during
indoor unit operation (sensing and sending errors into
the communication data)
237
Error of condenser temperature sensor (Open/Short)
251
Error of discharge temperature sensor (Open/Short)
201
System down caused by communication error after completion of tracking
Mismatching of indoor unit quantity setting error after completion of tracking 5 times
Communication and indoor unit errors
