If an error occurs, one of more of the LEDs on the display (see “Components” for their location) will flicker.
As a protection strategy, the unit stops operating (and the LED turns off). If the unit is turned on before the problem is resolved, the LED will resume flickering and the unit will stop operating again.
4-Way Cassette-Indoor, 1-Way Cassette-Indoor, Mini-4-Way Cassette-Indoor, Convertible Ceiling-Floor-Indoor, High Wall-Indoor, Big Duct-Indoor, Slim, MSP, and HSP Duct-Indoor, Mini-Outdoor.
Diagnostic LEDs for the high-wall indoor unit:
| Error Codes | Problem |
|---|---|
| E121 | Indoor temperature sensor error (shorted or open) |
| E122 | Evap-in sensor error (shorted or open) |
| E123 | Evap-out sensor error (shorted or open) |
| E126 | Discharge sensor error (shorted or open) |
| E154 | Indoor fan error |
| E221 | Outdoor temperature sensor error (shorted or open) |
| E237 | Condenser sensor error (shorted or open) |
| E251 | Discharge sensor error |
| E101 | No communication between indoor and outdoor units for 2 minutes |
| E102 | Communication error received from outdoor unit |
| E202 | 3-minute tracking error on outdoor unit |
| E201 | Communication error after tracking due to non-matching quantity of installed indoor units |
| E108 | Error due to repeated communication address |
| E109 | Communication address not confirmed |
| E151 | Error due to opened EEV (2nd detection) |
| E152 | Error due to closed EEV (2nd detection) |
| E128 | Evap-in sensor is loose |
| E129 | Evap-out sensor is loose |
| E198 | Thermal switch error (open) |
| E241 | Condenser mid-sensor is loose |
| E554 | Refrigerant leakage (2nd detection) |
| E450 | Abnormally high temperature on condenser (2nd detection) |
| E451 | Low pressure switch (2nd detection) |
| E416 | Abnormally high discharge air temperature on outdoor unit (2nd detection) |
| E559 | Indoor unit operation stopped due to unconfirmed error on outdoor unit |
| E425 | Reverse phase detection error |
| E403 | Compressor operation stop due to freeze detection(6th detection) |
| E301 | High pressure sensor is loose |
| E306 | Low pressure sensor is loose |
| E428 | Outdoor unit compression ratio error |
| E413 | Outdoor sump down_1 prevention control |
| E410 | Compressor operation stopped due to low pressure sensor prevention control |
| E180 | Simultaneous opening of cooling/heating MCU solenoid valve (1sst detection) |
| E181 | Simultaneous opening of cooling/heating MCU solenoid valve (2nd detection) |
| E153 | Float switch (2nd detection) |
| E162 | EEPROM error |
| E163 | EEPROM option error |
| E164 | Incompatible indoor unit error |
Error codes for the C-series 4-way cassette indoor unit:
| Error Codes | Problem |
|---|---|
| 416 | Compressor down due to protection control of the discharge temperature sensor |
| 450 | Error due to condenser temperature sensor when in cooling mode |
| 451 | Error of the low pressure switch (Protection control) |
| 425 | Reverse phase error (Protection control) |
| 551 | In removing frost |
| 221 | Error of outdoor temperature sensor (Open/Short) |
| 237 | Error of condenser temperature sensor (Open/Short) |
| 251 | Error of discharge temperature sensor (Open/Short) |
| 201 | System down caused by communication error after completion of tracking Mismatching of indoor unit quantity setting error after completion of tracking 5 times |
| 121 | Error of temperature sensor in the indoor unit (Open/Short) |
| 122 | Error of the heat exchanger sensor in the indoor unit (Open/Short) |
| 419 | Error of electronic expansion valve open in the outdoor unit (when it is detected more than once) |
| 422 | Error of electronic expansion valve close in the outdoor unit (when it is detected more than once) |
| 601 | Error of communication between the indoor unit and the wired remote controller |
| 602 | Master wired remote controller / slave wired remote controller |
| 606 | Polarity error (F1/F2, F3/F4 switched) |
| EA | Error of setting option for wired remote controller COM2 |
Troubleshooting
Problem: The unit does not operate immediately after restarting it.
Solution: The anti-short cycle timer prevents the unit from operating immediately to keep it from overloading. The unit will start in 3 minutes.
Problem: The unit does not operate.
Solution: Verify the following;
- The power plug is properly inserted into the wall receptacle.
- There has not been a power failure.
- The circuit breaker is switched on/fuses are good.
Problem: The temperature does not change.
Solution: Verify that the unit is not operating in Fan mode. If it is, select a different mode.
Problem: The unit is not producing warm/ cool air.
Solution: Verify the following;
- Temperature setting on remote control is higher/lower than the current temperature.
- Air filter is not clogged with dirt.
- If the unit has just been turned on, wait 3 minutes for the anti-short cycle timer to expire.
- Air flow is unobstructed.
- Line size and length is correct and does not exceed factory recommendations.
- Operating mode is heat/cool.
- If unit is not producing warm air, is it set to Cool mode?
- Remote control is not for a cooling-only unit.
- That the unit has not been installed in direct sunlight. If so, hang curtains or shades on windows to filter the sun and increase unit efficiency.
Problem: The fan speed does not change.
Solution: Verify that Auto or Dry mode is selected. Either of these modes automatically adjust the fan speed.
Problem: Timer function does not work.
Solution: Press the Power button on the remote control after setting the time.
Problem: Odors permeate the room during operation.
Solution: Verify the origin of the odor. Operate the unit in Fan mode or open the windows to air out the room.
Problem: The unit makes a bubbling sound
Solution: A bubbling sound may be heard;
- When the refrigerant is circulating through the compressor.
- By the drain pump inside the unit when you press the Power button.
Problem: Water is dripping from the air flow blades.
Solution: If the unit has been running for an extended period of time with the blades fully open, adjust the blades to mid-position to alleviate condensation formation.
Problem: The remote control is not working.
Solution: Verify that;
- Batteries are not depleted.
- Batteries are correctly installed.
- Nothing is blocking the remote control sensor.
- No strong fluorescent or neon lighting is near the unit, which may interrupt the signal.
Problem: The unit does not turn on/off with the wired remote control.
Solution: Ensure that the wired remote control is not set for Group Control.
Problem: Indicators on the digital display flash.
Solution: Press the Power button on the remote control to turn the unit off. Then switch the circuit break off and then on again.
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