Service and Parts Manual (2019, 2020, 2021, 2022)

20 PB
OPERATION
Sequence of Operation
Protection / Failure code
1 Anti-frozen protection for indoor evaporator:
If IPT≤32°F for continuous 3min, compressor shut off, fan motor keeps former operation; 3min later, if IPT≥50°F, compressor
start up operation and fan motor keeps the former running status.
2 SENSOR error protection
When sensor short circuit or broken, Room Temperature failure shows E1, and Coil Temperature failure shows E2. When E1
or E2 happened, compressor stops and indoor fan motor operates at the set speed.
When AC on STANDBY, there is no malfunction inspection.
The NTC sensor resistance: 5kΩ/ 77°F
3 Compressor protection
If unit is on STANDBY before power off, there is no 3-min protection while switch on, otherwise the unit always has 3-min
protection.
4 SELF-DIAGNOSIS function
Press the ON/OFF button rst, and then switching on unit. AC works and checks as below accordingly:
Buzzer BIBI 2 times, 88 Digital fully lights, Electric heating (for cooling & heating) , Compressor , High fan speed ,Medium
speed ,Low speed , Health , WIFI LED, indicator of Heat/Cool /High speed/Dry / Medium speed / Low speed/Auto fan/ Timing /
Sleep/ Filter cleaning/ ECO/Health, Room temperature , Indoor coil Temperature , EEPROM calibration etc.
After self-diagnosis, unit to STANDBY (Note: unit with auto restart function will operate according to it’s former status)