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42
ERROR CODES
The U-Match System has on board diagnostics. The indoor unit and Tether Controller will display error codes. The
following is a summary of the codes with explanation:
No.
Error
Code
Malfunction
Name
Origin of
Malfunction
Description
1
E1
High Pressure
Protection
High Pressure
Switch
If outdoor unit detects the high pressure switch is cut off for 3-sec 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 system won't be recovered automatically. Switch off the unit or re-
energize the unit after cutting off power to eliminate this protection.
2
E2
Indoor Coil
Freeze
Protection
Indoor
Evaporator
Temperature
Sensor
If indoor unit detects the evaporator temperature is lower than protective temperate
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 3-min.
3
E3
Low Pressure
Protection
Low Pressure
Switch
If outdoor unit detects low-pressure switch is open during ON or standby state
within 30-sec successively the unit will report a low pressure protection. If the fault
occurs 3 times successively within
30-min, the unit will not recover automatically.
Low
Refrigerant
Protection
If the unit reports low refrigerant level within 10-min 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 the unit enters refrigerant recovery mode through special operation, E3 will be
displayed. After exiting refrigerant recovery mode, the code will disappear.
4
E4
Compressor
High Discharge
Temperature
Protection
Compressor
Discharge
Temperature
If outdoor unit detects the discharge temperature is higher than protective
temperature 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 reset this protection.
5
E6
Communication
Malfunction
Communication
Failure
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 abnormality between
display board and indoor unit, communication malfunction will be reported.
6
E8
Indoor
Fan
Motor
If the indoor unit does not receive signal from indoor fan motor for 30-sec
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.
7
E9
Condensate
Overflow
Protection
Overflow
Switch
If indoor unit detects the condensate overflow switch warning for
8-sec successively,
the system will enter condensate overflow
protection. The unit will shut off and will
not recover automatically.
Switch unit off and then switch it on to eliminate this
malfunction.
8
F0
Indoor Ambient
Temperature
Sensor at
Return Air Inlet
Malfunction
Indoor Ambient
Temperature
Sensor
If indoor unit detects the indoor ambient temperature sensor is open circuit or short
circuit for 5-sec 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 will operate normally.
9
F1
Indoor
Evaporator Coil
Temperature
Sensor
Malfunction
Evaporator Coil
Temperature
Sensor
If indoor unit detects the evaporator temperature sensor is open circuit or short circuit
for 5-sec 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 will operate normally.
