mrcool.com 34
34
MAINTENANCE
4
No.
Error
Code
Malfunction
Name
Origin of
Malfunction
Signal
Control Description
16 H3
Compressor
overload
protection
Compressor
overload switch
If it is detected within 3 seconds successively that the
overload switch is cut o under On or Standby state, the
unit will report overload protection. If the fault occurs
successively 3 times, the unit cannot be recovered
automatically. Switch o the unit or re-energize the unit
after cutting o power to eliminate this protection.
17 H4
Overload
Protection
Evaporator
temperature,
condenser
temperature
If the unit detects that the tube temperature is higher
than the protective temperature value, the unit will report
overload protection. The unit will not restart operation until
tube temperature is lower than protective temperature
value and the compressor is stopped for 3 minutes. If
the protection occurs over 6 times, the unit cannot be
recovered automatically. Switch o the unit or re-energize
the unit after cutting o power to eliminate this protection.
18 H6
Malfunction of
condenser fan
motor
Condenser fan
motor
If the unit does not receive signal from condenser fan
motor for 30 seconds successively when the fan motor
is operating, condenser fan motor malfunction will be
reported. In this case, the unit can automatically resume
operation after stopping. If the malfunction occurs 6
times within one hour, the unit cannot be recovered
automatically. Switch o the unit or re-energize the unit
after cutting o power to eliminate this malfunction.
19 U7
Direction
changing
malfunction of
4-way valve
4-way valve
After the compressor starts operation in heating more,
if the unit detects the dierence between evaporator
temperature and indoor ambient temperature is lower
than the protective value for 10 minutes successively,
direction changing malfunction of 4-way valve will be
reported and the outdoor unit will stop operation. The
unit can automatically resume operation in the rst two
malfunctions. If the malfunction occurs 3 times, the unit
cannot be recovered automatically. Switch o the unit or
re-energize the unit after cutting o the power to eliminate
this malfunction.
20 P6
Communication
malfunction
between main
control board
and drive board
Communication
between main
control board
and drive board
If the outdoor main control board does not receive data
from the drive board, communication malfunction between
main control and drive will be reported. This malfunction
can be eliminated automatically.
21 EE
Malfunction of
main control
memory chip
Main control
board
If the memory chip of the main control board is broken,
the unit cannot be started. The unit cannot be recovered
automatically. If the malfunction cannot be eliminated after
switching o the unit and then energizing the unit several
times, replace the outdoor main control board.
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