Service Manual

U-Match Series DC Inverter Service Manual
97
No.
Error code
Malfunction
name
Origin of
malfunction
signal
Control description
16
H4
Overload
protection
Evaporator
temperature,
condenser
temperature
If outdoor unit detects that the tube temperature is higher than
protective temp. value, the unit will report overload protection.
The unit will not restart operation until tube temperature is lower
than the protective temp. value and the compressor is stopped
for 3min. If the protection occurs over 6 times, the unit cannot be
recovered automatically. Switch off the unit or re-energize the
unit after cutting off power to eliminate this protection.
17
H6
Malfunction of
outdoor fan motor
Outdoor fan
motor
If the outdoor unit does not receive signal from outdoor fan motor
for 30s successively when the fan motor is operating, outdoor 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 off the unit or re-energize the unit after
cutting off power to eliminate this malfunction.
18
U7
Direction
changing
malfunction of
4-way valve
4-way valve
After the compressor starts operation in heating mode, if the
outdoor unit detects the difference between evaporator
temperature and indoor ambient temperature is lower than the
protective value for 10min 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 first two malfunctions. If the malfunction occurs 3 times, the
unit cannot be recovered automatically. Switch off the unit or
re-energize the unit after cutting off power to eliminate this
malfunction.
19
P6
Communication
malfunction
between main
control and drive
Communication
between main
control board and
drive board
If the outdoor main control board does not receive data from
drive board, communication malfunction between main control
and drive will be reported. This malfunction can be eliminated
automatically.
20
EE
Malfunction of
outdoor main
control memory
chip
Outdoor main
control board
If the memory chip of outdoor main control board is broken, the
unit cannot be started. The unit cannot be recovered
automatically. If the malfunction cannot be eliminated after
switching off the unit and then energizing the unit for several
times, please replace the outdoor main control board.