100
PB
TROUBLESHOOTING
Error Codes
No. Malfunction Name Error
Code
A/C Status
Possible Causes
6
Electric Heater
Protection Error
A2
LOCKS OUT OPERATION
The purpose of A2 protection is
electric heater safety while PTAC’s
normal operation, so we reserved
more buffer.
Normal voltage fluctuation will
usually not trigger A2 protection.
10% above or below
Current range of single electric
heater:
1.00 kW heater: 2.5A-7A
1.55kW heater: 4A-9A
2.45kW heater: 6A-14A
Current range when electric heater
combined:
3.45kW heaters: 9A-20A
5.00kW Heaters: 12.5A-29A
If current over above range, A2
protection will be triggered. f
the sensor detects current over
2A when electric heater is not
working, or if the sensor detects
current difference between L and
N line are over 2.5A, A2 protection
will be triggered.
1. Open heater
2. Defective logic board
3. Indoor fan damage
4. Main pcb detects current leak
5. Loose wireing on board or heater harness
6. A2 protection might also be triggered by intefer-
ence, disconnect plug for a few minutes to reset
and clear A2 protection.
7
Compressor Over
current protection
E5
Over 17 amps through compressor
for 3 seconds compressor and
condenser fan will stop and indoor
will operate
1. User need to reset unit by unplug and reconnect
unit
2. Check for dirty condenser or open compressor
3. Check power supply
8
Overload detection
protection
H3
The voltage of power source is too
low.
The air flow volume of condenser
is too
1.Fan motor locked up.
2. Coil is dirty.
3. The outdoor temperature is higher than the
operation temperature allowed for this unit.
9
Low Refrigerant
protection
FO
The unit will not operate
1. Check indoor coil thermistor location
2. (Refer to the resistance table for temperature
sensor) thermistor resistance 20k ohms at 77°F
6
The unit will
“attempt” to
provide heating
or cooling,
dependent
upon the error
in wiring and/
or configuration
of the wired
controller
Status light blinks 9 times, off for 3
seconds, then repeats
Improper connection and/or improper
configuration of wired controller.
