Casper air conditioner indicator lamps and blink codes
Many units show a fault only by blinking lamps. Find the pattern you see, then open the code.
| Code | How it shows | Meaning |
|---|---|---|
| E0 | LED Code: RUN、TIMER -both winking | Indoor and outdoor communication failure |
| E1 | LED Code: RUN-1 time/8s | Indoor room temperature sensor (IRT) |
| E2 | LED Code: RUN-2 times /8s | Indoor coil temperature sensor (IPT) |
| E3 | LED Code: RUN-3 times /8s | Outdoor coil temperature sensor (OPT) |
| E4 | LED Code: RUN-4 times /8s | System abnormity |
| E5 | LED Code: RUN-5 times /8s | Model configuration wrong |
| E6 | LED Code: RUN-6 times /8s | Indoor fan motor fault |
| E7 | LED Code: RUN-7 times /8s | Outdoor temperature sensor |
| E8 | LED Code: RUN-8 times /8s | Exhaust temp. sensor |
| E9 | LED Code: RUN-9 times /8s | IPM drive and module fault |
| EA | LED Code: RUN－11 times /8s | Current sensor fault |
| EC | LED Code: RUN、TIMER -both winking | Outdoor communication failure |
| EE | LED Code: RUN-12 times /8s | Indoor unit EEPROM fault |
| EF | LED Code: RUN-10 times /8s | Outdoor fan motor fault (DC motor) |
| EP | LED Code: RUN-13 times /8s | Temp. switch fault ( on top of the compressor) |
| EU | LED Code: RUN-14 times /8s | Voltage sensor fault |
| P0 | Function indicator: RUN: Blink; TIMER: 10 blink /8 sec | Module protection (hardware control) |
| P1 | Function indicator: RUN: Blink; TIMER: 1 blink /8 sec | Overvoltage /lower voltage protection |
| P2 | Function indicator: RUN: Blink; TIMER: 2 blink /8 sec | Overcurrent protection |
| P4 | Function indicator: RUN: Blink; TIMER: 4 blink /8 sec | Exhaust over temperature protection |
| P5 | Function indicator: RUN: Bright; TIMER: 5 blink /8 sec | Too cool protection in cooling mode |
| P6 | Function indicator: RUN: Bright; TIMER: 6 blink /8 sec | Overheat protection in cooling mode |
| P7 | Function indicator: RUN: Bright; TIMER: 7 blink /8 sec | Overheat protection in heating mode |
| P8 | Function indicator: RUN: Bright; TIMER: 8 blink /8 sec | Outdoor over temperature / lower temperature protection |
| P9 | Function indicator: RUN: Blink; TIMER: 9 blink /8 sec | Drive protection (software control ) |
| LED:BLINK=1 | Blink count: 1 | IPM protection |
| LED:BLINK=2 | Blink count: 2 | Over voltage /lower voltage |
| LED:BLINK=3 | Blink count: 3 | Overcurrent |
| LED:BLINK=4 | Blink count: 4 | Exhaust over temperature protection |
| LED:BLINK=5 | Blink count: 5 | Outdoor coil over temperature protection |
| LED:BLINK=6 | Blink count: 6 | Drive fault and protection (V1，VP1) |
| LED:BLINK=7 | Blink count: 7 | Communication fault with indoor unit |
| LED:BLINK=8 | Blink count: 8 | Compressor overheat fault (compressor top switch) |
| LED:BLINK=9 | Blink count: 9 | Short-circuit / open-circuit fault of outdoor temperature sensor |
| LED:BLINK=10 | Blink count: 10 | Short circuit / open-circuit fault of outdoor heat exchanger temperature sensor |
| LED:BLINK=11 | Blink count: 11 | Short-circuit / open-circuit fault of exhaust temperature sensor |
| LED:BLINK=12 | Blink count: 12 | Voltage sensor fault |
| LED:BLINK=13 | Blink count: 13 | Current sensor fault |
| LED:BLINK=14 | Blink count: 14 | IPM fault |
| LED:BLINK=15 | Blink count: 15 | Communication fault between power source board and IPM |
| LED:BLINK=16 | Blink count: 16 | No feedback from DC fan motor(outdoor unit) |
| LED:BLINK=17 | Blink count: 17 | Defrost state |
Guides
- Air conditioner repair, stage by stage: from the call to the hand-over
The eight stages of an air conditioner repair: symptoms, safety, reading the code, narrowing down, measuring, repairing, test run, hand-over.