U-Match Series DC Inverter Service Manual
94
MAINTENANCE
1 TROUBLE TABLE
1.1 Main Control Malfunction
Table 1 Fault Display on Indoor Wired Controller
Origin of
malfunction
signal
When outdoor unit detects the high pressure switch is cut off for 3s
successively, high pressure protection will occur. All the loads (except
the 4-way valve in heating mode) will be switched off. In this case, all
the buttons and remote control signals except ON/OFF button will be
disabled and cannot be recovered automatically. Switch off the unit or
re-energize the unit after cutting off power to eliminate this protection.
Indoor
evaporator
temperature
sensor
If detecting that the evaporator temperature is lower than protective
temp. Value after the unit has been running for a period of time under
cooling or dry mode, the unit will report this fault, in which case the
compressor and outdoor fan motor will be stopped. The unit will not run
until evaporator temperature is higher than the protective temp. value
and the compressor is stopped for 3min.
If it is detected within 30s successively that the low-pressure switch is
cut off under ON or standby state, the unit will report low pressure
protection. If the fault occurs successively 3 times within 30min, the unit
cannot be recovered automatically.
Refrigerant
lacking
protection
If the unit reports system refrigerant lacking within 10min after turning
on the unit, the unit will stop operation. If the fault occurs successively 3
times, the unit cannot be recovered automatically.
Refrigerant
recycling mode
If enter refrigerant recycling mode through special operation, E3 will be
displayed. After exiting refrigerant recycling mode, the code will
disappear.
Compressor
high discharge
temperature
protection
Compressor
discharge
temperature is
high
If outdoor unit detects that the discharge temperature is higher than
protective temp. Value, the unit will report high discharge temperature
protection. 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.
Communicatio
n malfunction
Communicatio
n between
indoor and
outdoor
mainboard
If the outdoor unit does not receive data from indoor unit,
communication malfunction will be reported. If there is communication
abnormity between display board and indoor unit, communication
malfunction will be reported too.
Malfunction of
indoor fan
motor
If the indoor unit does not receive signal from indoor fan motor for 30s
successively when the fan motor is operating, indoor 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.
If cut-off of water level switch is detected for 8s successively once
energized, the system will enter full water protection. In this case,
switch off the unit and then switch it on to eliminate this malfunction.
Malfunction of
indoor ambient
temperature
sensor at air
return port
Indoor ambient
temperature
sensor
If the indoor ambient temperature sensor is detected of open circuit or
short circuit for 5s successively, indoor ambient temperature sensor
malfunction will be reported. The unit can automatically resume
operation after the malfunction disappears. If indoor ambient
temperature sensor malfunction occurs in fan mode, only the error code
is displayed and the indoor unit can work normally.
Malfunction of
evaporator
temperature
sensor
Evaporator
temperature
sensor
If the indoor evaporator temperature sensor is detected of open circuit
or short circuit for 5s successively, evaporator temperature sensor
malfunction will be reported. The unit can automatically resume
operation after the malfunction disappears. If evaporator temperature
sensor malfunction occurs in fan mode, only the error code is displayed
and the indoor unit can work normally.
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