pressure switch act, low pressure switch has acteivated more than 30 seconds, LCD will display
Low pressure abnormal
(3) In defrosting and in 6 minute after defrost is over , low pressure switch will not be checked.
(4) In heating, compressor run and outdoor motor stop, low pressure switch will be shielded.
(5) Low pressure protection can be resumable when power-off.
4.6 3-minutes protection for compressor
After compressor stops, it cannot be started until 3 minutes later. During the machine’s running,
if the time not more than 3 minutes after power is off, the compressor cannot be restarted until 3
minutes later after it is powered on again
4.7 Sensor broken down protection
a. Check if sensor breaks down
After compressor has run for 2 minutes, the unit will check the sensor, Outdoor board checks
the sensor in short circuit or in open circuit or near to short/open circuit for 2 minutes continuously,
then it will adjust the sensor broken down.
b. How to deal with it?
If the outdoor ambient temperature sensor and the outdoor coil temperature sensor have
broken down, the unit will stop running, and alarm E3, E4, E4 simultaneously.
4.8 Starting current control
Outdoor unit load control: after the outdoor motor running for 2 seconds, main compressor start
up, the secondary compressor will run 2 seconds later.
4.9 4-way valve control
5. Outdoor PCB test
(1) There are three pins marked with TEST, please make the two ones near to COOL in short circuit.
Outdoor begin to run in cooling mode, that is, compressor run and outdoor motor works at high
speed.
(2) There are three pins marked with TEST, please make the two ones near to HEAT in short circuit.
Outdoor begin to run in heating mode, that is, compressor and 4-way valve run, outdoor motor
works at low speed.
6. Failure code list
Failure description
Code on wired
controller
Flash times of indoor
receiver board
Room temp. sensor abnormal 01 Power LED flashes 1 time
Indoor coil temp. sensor abnormal 02 Power LED flashes 2 times
Outdoor temp. sensor abnormal 4A Power LED flashes 3 times
Outdoor coil temp. sensor abnormal 49 Power LED flashes 4 times
Over-current malfunction 48 Power LED flashes 5 times
High / Low pressure abnormal 53 Power LED flashes 6 times
Communication malfunction between indoor and wired controller 07 Power LED flashes 8 times
Communication malfunction between indoor and outdoor abnormal 06 Power LED flashes 9 times
Drainage system malfunction 08 Power LED flashes 10 times
Alarm of exterior annunciator 0B Power LED flashes 11 times
Coil gas pipe temp. Sensor abnormal 03 Power LED flashes 12 times
Temperature protection malfunction 0D Power LED flashes 13 times
Commercial Air Conditioner Model: AP*****EAA AU*****EAA
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