Service Manual

U-Match Series DC Inverter Service Manual
95
MAINTENANCE
1 TROUBLE TABLE
1.1 Main Control Malfunction
Table 4-1-1 Fault Display on Indoor Wired Controller
No.
Error code
Malfunction
name
Origin of
malfunction
signal
Control description
1
E1
High pressure
protection
High pressure
switch
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.
2
E2
Freeze 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.
3
E3
Low pressure
protection
Low pressure
switch
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.
4
E4
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.
5
E6
Communication
malfunction
Communication
between indoor
and outdoor main
board
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.
6
E8
Malfunction of
indoor fan motor
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.