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INSTALLATION INSTRUCTIONS
Failure Codes
Digital tube
Failure code definition
indication on
main unit
26-3
Outdoor unit and VP-box
communication failure
26-4
27-0
Oil temp too high protection Toil1)
27-1
Oil temp too high protection (Toil2)
28
High pressure sensor Pd failure
29
Low pressure sensor Ps failure
30-0
High pressure switch HPS1 failure
30-1
High pressure switch HPS2 failure
32-0
Heat exchanger outlet temp. Tsco
failure
32-1
Liquid pipe SC temp. of subcooler Tliqsc
failure
33-0
EEPROM failure
33-2
33-3
34-0
Discharging temp too high protection
(Td1)
34-1
Discharging temp too high protection
(Td2)
35-0
4-way valve reversign failure
35-1
4-way valve reversin failure
36-0
Oil temp too low protection (Toil1)
36-1
Oil temp too low protection (Toil2)
39-0
Low pressure sensor Ps too low
protection
39-1
Compression ratio too high protection
40
High pressure sensor Pd too high
protection
31-5000573 Rev. 2
Failure description
The searched VP-box quantity is less than set quantity for
continuous 5 minutes.
The searched VP-box quantity is more than set quantity for
continuous 5 minutes.
shutdown alarm; the alarm condition after stopping the oil
temperature below 10 °F, automatic recovery after 2min 50s.
Four times an hour to confirm the fault
AD value is below 11 (open circuit) or over 1012 (short circuit) for
30s
AD value is below 11 (open circuit) or over 1012 (short circuit) for
If disconnected for 2s continuously, alarm. If alarm 3 times in an
hour, the failure is confirmed.
If AD value is below 11(open circuit) or over 1012(short circuit) fo
60 seconds, alarm, sensor has no alarm when abnormal in heating
mode.
AT24C04 EEPROM communication failure
AT24C04 EEPROM data check failure (model code, check sun
etc.)
AT24C04 EEPROM data check failure (data beyond limit, reverse
sequence etc.)
the alarm condition after stopping the oil temperature below 50
°F(10 °C), automatic recovery after 2min50s. Four times an hour
to confirm the fault
If below conditions are met for more than 10 seconds after the
4-way valve is energized for 10 minutes, reversing is finished.
is confirmed if the system alarms more than 3 times in one hour.
If there is 4-way valve of sub unit not electrified after main unit
heating detection starts up for 20 min, Failure is confirmed if
detection occurs more than 2 times in one hour.
In normal operation,if Toil < CT+ 50 °F(10 °C) for continuous 5
minutes,the unit is stopped and alarmed 2 minutes and 50 s
later, then is resumed automatically. If it occurs 3 times in an
hour, the failure is confirmed.
After compressor is running (except for residual operation),
if in cooling, Ps < 1 psi or in heating, Ps < 7 psi for continuous
5 minutes, alarm and stop. 2 minutes and 50 s later, resume
automatically. If it occurs 3 times in an hour, the failure is
confirmed.
continuous 5 minutes, stop and alarm. 2 minutes and 50 s later,
resume automatically. If it occurs 4 times in an hour, the failure
is confirmed.
automatically. If it occurs 3 times in an hour, the failure is
confirmed.
Remarks
Resumable
Once
confirmed
un-resumable
Resumable
Once
confirmed
un-resumable
Resumable
Once
confirmed
un-resumable
Once
confirmed
un-resumable
Once
confirmed
un-resumable
Once
confirmed
un-resumable
Once
confirmed
un-resumable
Once
confirmed
un-resumable
Once
confirmed
un-resumable
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