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49English
Appendix
Troubleshooting
The table below lists the self-diagnostic routines. For some of error codes, you must contact an authorized service
centre. If an error occurs during the operation, it is displayed on the outdoor unit PCB LED, both MAIN PCB and
INVERTER PCB.
No. Error Code Meaning Remarks
1 E108 Error due to duplicated communication address Check on repeated indoor unit main address
2 E121
Error on room temperature sensor of indoor unit
(Short or Open)
Indoor unit Room Thermistor Open/Short
3 E122 Error on EVA IN sensor of indoor unit (Short or Open) Indoor unit EVA_IN Thermistor Open/Short
4 E123
Error on EVA OUT sensor of indoor unit (Short or
Open)
Indoor unit EVA_OUT Thermistor Open/Short
5 E153 Error on float switch (2nd detection)
Indoor unit Float Switch Open/Short Drain Pump
operation Check
6 E154 Indoor fan error Check on indoor unit indoor Fan operation
7 E198 Error on thermal fuse of indoor unit (Open)
Thermal Fuse Open Check of indoor unit Terminal
Block
8 E201
Communication error between the indoor unit and
outdoor unit (Pre-tracking failure or when the actual
number of indoor units are different from the indoor
unit quantity setting on the outdoor unit)
Error due to communication tracking failure after
initial power is supplied (The error occurs regardless
of the number of units.)
Check indoor quantity setting in outdoor
9 E202
Communication error between indoor unit and
outdoor unit (When there is no response from indoor
units after tracking is completed)
Check electrical connection and setting between
indoor unit and outdoor unit
10 E203
Communication error between the outdoor unit and
main micom (For PF #4 to #6 controllers, error will
be determined from the time when the compressor is
turned on.)
Check electrical connection and setting between
outdoor unit MAIN PBA - INVERTER PBA
11 E221 Error on outdoor temperature sensor (Short or Open) Check Outdoor sensor Open / Short
12 E231 Error on outdoor COND OUT sensor (Short or Open) Check Cond-Out sensor Open / Short
13 E251
Error on discharge temperature sensor of compressor
1 (Short or Open)
Check Discharge sensor Open / Short
14 E320 Error on OLP sensor (Short or Open) Check OLP sensor Open / Short
15 E403 Compressor down due to freeze protection control Check Outdoor Cond.
16 E404 System stop due to overload protection control Check Comp. when it starts
17 E416 System stop due to discharge temperature -
18 E422 Blockage detected on high pressure pipe
1. Check if the service valve is open
2. Check for refrigerant leakage (pipe connections,
heat exchanger) and charge refrigerant if necessary
3. Check if there's any blockage on the refrigerant
cycle (indoor unit/outdoor unit)
4. Check if additional refrigerant has been added after
pipe extension
19 E425 Reverse phase or open phase Check whether 3 phase is reversed or opened.
Appendix
PAC_B2B 미라지 필리핀향_IBIM_EN_DB68-07271A-00_170504.indd 49 2017-06-02 오후 3:34:46
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