General Troubleshooting - Pioneer QUANTUM INVERTER Series Service & Troubleshooting Manual

2. General Troubleshooting

2.1 Error Display (Indoor Unit)
When the indoor unit encounters a recognized error, the operation lamp will flash in a corresponding series, the
timer lamp may turn on or begin flashing, and an error code will be displayed. These error codes are described
in the following tables:
Operation Timer
Lamp Lamp
1 time
OFF
2 times
OFF
3 times
OFF
4 times
OFF
5 times
OFF
6 times
OFF
9 times
OFF
7 times
OFF
1 times
ON
2 times
ON
3 times
ON
4 times
ON
7 times
ON
5 times
ON
6 times
ON
1 times
FLASH
2 times
FLASH
3 times
FLASH
5 times
FLASH
7 times
FLASH
6 times
FLASH
For other errors:
The display board may show a garbled code or a code undefined by the service manual.
Ensure that this code is not a temperature reading.
Troubleshooting:
Test the unit using the remote control. If the unit does not respond to the remote, the indoor PCB requires
replacement. If the unit responds, the display board requires replacement.
Display Error Information
E0
Indoor unit EEPROM parameter error
E1
Indoor / outdoor unit communication error
E2 Zero-crossing signal detection error(for some models)
E3
The indoor fan speed is operating outside of the normal range
Indoor room temperature sensor T1 is in open circuit or has short
E4
circuited
Evaporator coil temperature sensor T2 is in open circuit or has
E5
short circuited
Indoor PCB/Display board communication error(for some models)
E7/EH 0B
EC Refrigerant leak detected
F0 Current overload protection
Outdoor room temperature sensor T4 is in open circuit or has
F1
circuited
Condenser coil temperature sensor T3 is in open circuit or has
F2
short circuited
Compressor discharge temperature sensor TP is in open circuit
F3
or has short circuited
Evaporator coil outlet temperature sensor T2B is in open circuit or
F6
has short circuited(for free-match indoor units)
F4 Outdoor unit EEPROM parameter error
The outdoor fan speed is operating outside of the normal range
F5
(for some models)
P0 IPM malfunction or IGBT over-strong current protection
P1
Over voltage or over low voltage protection
High temperature protection of IPM module or High pressure
P2
protection
P4 Inverter compressor drive error
High pressure protection or low pressure protection
P6
(for some models)
P5/-- Indoor units mode conflict(match with multi outdoor unit)
Troubleshooting

4

Solution
TS19
TS20
TS22
TS23
TS26
TS26
TS27
TS28
TS29
TS26
TS26
TS26
TS26
TS19
TS23
TS30
TS31
TS32
TS34
TS35
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