DeDietrich MUSE40-2 - Troubleshooting; Wifi Module

20181270 CR v8-2019Page 50
Troubleshooting
Do not have the air conditioner repaired by an unqualified person, as there are risks associated with the electrics and
R32 refrigerant fluid. Always contact a professional.
Error code
Problem
L1
Overcurrent protection fault
L3
Compressor supply fault (phase loss)
L4
Inverter protection module fault
E1
Room temperature sensor fault
E2
Fault on the refrigerant sensor in the OU
E3
Fault on the refrigerant sensor in the IU
E4
IU fan fault (motor PG)
E5 (5E)
Communication error between IU and OU
E8
Communication error between the display and the
PCB on the indoor unit
F0
OU fan fault (motor DC)
F1
Inverter PCB fault (IPM)
F2
OU protection PCB fault (PFC)
F3
Compressor fault
F4
Discharge sensor fault
F5
Compressor overcurrent fault
F6
Outside air sensor fault
F7
High or low voltage fault
F8
Communication fault
F9
OU EEPROM fault
H1
Condensate discharge fault
H2
Communication error between the wired remote
control and the PCB on the indoor unit
H5
Low discharge temperature sensor fault
H6
Low pressure sensor fault
H7
Low pressure fault
H8
4-way valve fault
FA
Inlet sensor fault
P2
High pressure sensor fault
P4
Electrical overload in cooling mode
P5
Electrical overload in heating mode
P6
IU overheating protection in heating mode
P7
IU frost protection in cooling mode
P8
OU overcurrent protection
WiFi module
Using and installing the WiFi option on wall-mounted units
 Step 1
For UME 25/35 units, the WiFi module is installed on a detachable panel of the indoor unit.
 For UME 50/70 units, the WiFi module is installed inside the filter support block.