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Page 31
mrcool.com
Troubleshooting
Problem Time of Occurrence Cause
Mist comes from
the unit.
Unit does not run.
The unit
generates noise.
The unit emits
odor.
Indoor unit still
runs after being
switched off.
Dust comes
from the unit.
During operation.
When power is turned on.
When unit is started immediately
after it is just turned off.
There is a continuous sound when
cooling.
The unit makes a sound when unit
starts or stops.
Slight cracking sound is heard when
unit is turned on.
Electronic expansion valve
initialization can cause this noise
temporarily.
There is slight and continuous sound
when unit is running or after running.
When unit is run after an extended
period of not being operated.
After every indoor unit receives a
"stop" signal, the fan will continue
running.
If the unit is running under high
humidity, the wet air in the room
will be quickly cooled down.
Overload protection switch causes
a 3 minute delay.
Start up could be delayed
up to 1 minute.
Gas refrigerant flow can cause a
slight noise.
Gas refrigerant flow can cause a
slight noise.
The drainage system can cause
this noise during operation.
Dust has settled inside the indoor
unit and is being dispersed from the
system.
During operation.
Smells from the operating
environment may be pulled through
the air handler.
Indoor fan can be set as “ON” or
“AUTO” mode. Under “ON” mode,
indoor fan will keep running after
switching off the unit.
(2) The following situations are not operation failures.
There are LED indicators on the main board of the indoor unit, which are used to display the
operating status and malfunction information of the unit.
Power Indicator
Red
Indoor unit main board is powered on, Power Indicator is on.
Running Indicator
Green
-After detecting the signal that the indoor fan is turned on,
the running indicator light is on.
-After detecting the signal the indoor fan is turned off, the
running indicator light is off.
-When detecting a system failure, the running indicator
light flashes.
Different running indicator flashing light means different system failure.
Lorem ipsum
Flash means that the light is
on 0.5S, and then light out
0.5S
Light will go out for 3 seconds and
then flash once.
Light will go out for 3 seconds and
then flash twice.
Light will go out for 3 seconds and
then flash four times.
Indoor tube temperature
sensor failure
Indoor fan failure
Indoor Jumper cap failure
LED indicator
Color
Function
Malfunction
Running Indicator status
Remark
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