Carrier AC error codes – VRF Full DC Inverter - indoor units
14 codes from the Carrier service manual, with what each one means and the usual causes. Hi-wall and cassette use some codes differently (E0) - check the indoor type.
You can safely switch the unit off at the switch, wait 5 minutes and switch on again. Don't open the unit, touch wiring or handle gas: these checks need a trained technician.
FE
No address at first power-on
What our technician checks
- X Power IDU: auto addressing (set SW6, power off/on ODU+IDU, wait 6-12 min) or manual. Others: manual addressing by remote after re-powering ODU.
H0
M-Home not matching
Book a technician for H0E0
Hi-wall: outdoor power supply fault (phase loss/sequence). Cassette: mode conflict
What our technician checks
- Hi-wall: check ODU supply & phase (see ODU E1). Cassette: match IDU mode to the system (heating has priority).
E1
Indoor-outdoor communication error
What our technician checks
- Check P-Q-E communication wire for open/short (measure resistance), daisy-chain (hand-in-hand) layout, shielding, distance from power cables, lamps/transformers nearby, wire length. All IDUs powered? Duplicate addresses? Voltage P/Q to E about DC 2.5 V (0 V or 5 V = 485 chip faulty). 485 chip 13089 on IDU board.
E2
Room temperature sensor T1 fault
What our technician checks
- Sensor plugged in
- sensor open/short.
E3
Middle evaporator sensor T2 fault
What our technician checks
- Sensor plugged in
- sensor open/short.
E4
Evaporator outlet sensor T2B fault
What our technician checks
- Sensor plugged in
- sensor open/short.
E5
Hi-wall: T3 / T4 / discharge T7 sensor fault
What our technician checks
- Check the outdoor sensors.
E6
Hi-wall: mode conflict
What our technician checks
- Heating has priority in a 2-pipe system
- cooling IDUs conflict when another is heating.
E7
EEPROM malfunction
What our technician checks
- EEPROM pins seated
- EEPROM broken
- PCB wet/damaged.
EE
Water level alarm
What our technician checks
- Drain blocked
- drain lift too high
- float switch connection & condition.
ED
Outdoor unit malfunction
What our technician checks
- Read the code on the outdoor unit display.
IDU dead
Indoor board has no power
What our technician checks
- TRANS IN 220 V
- transformer output AC 14.5 V (brown), AC 10.5 V (yellow)
- 7085 regulator DC +5 V / +12 V.
IDU leaking
Indoor unit leaking water
What our technician checks
- Drain pump, float switch wire, drain slope 1/100, lift height, blocked outlet, insulation at joints, main drain blocked.
Code not here, or still showing?
Send a photo of the display and the model sticker on WhatsApp. We'll tell you what it means and whether it needs a visit.
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