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SiUS342303E
[2-47]: Heat pump lockout release differential
Heat pump would be resumed when the outdoor air temperature is recovered by differential
(below) above the heat pump lockout temperature.
Heat pump lockout
release differential
When heat pump lockout mode has been set the auto backup function will automatically be set.
This will allow the auxiliary or secondary heat source to be automatically energized in the event of a
system failure.
Error codes capable of auto backup are listed in the table below.
Please be aware that the error codes that are not listed do not auto backup in order to protect the
unit.
Activation of high pressure switch
Activation of low pressure sensor
Compressor motor lock
Compressor damage alarm
Outdoor fan motor abnormality
Electronic expansion valve coil abnormality
Position signal abnormality of outdoor unit fan motor
Outdoor air thermistor abnormality
Discharge pipe temperature abnormality
Wet alarm
Discharge pipe thermistor abnormality
Compressor body thermistor abnormality
Suction pipe thermistor abnormality
Heat exchanger deicer thermistor abnormality
Heat exchanger gas pipe thermistor abnormality
Subcooling heat exchanger liquid pipe thermistor abnormality
Heat exchanger liquid pipe thermistor abnormality
Subcooling heat exchanger gas pipe thermistor abnormality
Electrical box air outlet thermistor abnormality
High pressure sensor abnormality
Low pressure sensor abnormality
Inverter PCB abnormality
Radiation fin temperature rise abnormality
Compressor instantaneous overcurrent
Compressor overcurrent
Compressor startup abnormality
Transmission error between inverter and outdoor unit main PCB
Part 5 Field Settings and Test Operation
Fahrenheit (°F)
0
1 (default)
10
2
15
Error contents
Celsius (°C)
5
2.8
5.6
8.3
Field Setting from Outdoor Unit
Error code
(Auto backup possible)
E3
E4
E5
E6
E7
E9
H3
H7
H9
F3
F4
J3
J5
J6
J7
J8
J9
JA
JC
L1
L4
L5
L8
L9
LC
208
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Troubleshooting
