Haier MRV 5-RC AB052MAERA, Service Manual

Page: 173 / 243

170
Digital
tube
indication
on master
unit
Failure code definition Failure description Remarks
26-3
Outdoor unit and VP-
box communication
failure
The searched vp box quantity is less than set quantity for
continuous 5 minutes
26-4
The searched vp box quantity is more than set quantity for
continuous 5 minutes
27-0
Oil temp.too high
protection
（
Toil1
）
Toil
≧
120
℃
continuous 2sec exceeds the set value after
shutdown alarm; the alarm condition after stopping the oil
temperature below 10 degrees, automatic recovery after 2min50s.
Four times an hour to confirm the fault
Once
confirmation
un-resumable
27-1
Oil temp.too high
protection
（
Toil2
）
28
High pressure sensor
Pd failure
AD value is below 11(open circuit)or over 1012(short circuit)for 30
seconds
resumable
29
Low pressure sensor
Ps failure
AD value is below 11(open circuit)or over 1012(short circuit)for 30
seconds
30-0
High pressure switch
HPSi failure
If disconnect for 2s continuously,alarm.If alarm 3 times in an
hour,confirm the failure
Once
confirmation
un-resumable
30-1
High pressure switch
HPS2failure
32-0
Heat exchanger outlet
temp. Tsco failure
If AD value is below 11 (open circuit) or over 1012 (short circuit)
for 60 seconds, alarm, sensor has no alarm when abnormal in
heating mode.
resumable
32-1
Liquid pipe SC temp. of
subcooler Tliqsc failure
33-0
EEPROM failure
AT24C04 EEPROM communication failure
Once
confirmation
un-resumable
33-2 AT24C04 EEPROM data check failure(model code,check sun etc)
33-3
AT24C04 EEPROM data check failure(data beyond limit,reverse
sequence etc)
34-0
Discharging temp.too
high protection
（
Td1
）
Td
≧
120
℃
continuous 2sec exceeds the set value after shutdown
alarm; the alarm condition after stopping the oil temperature below
10 degrees, automatic recovery after 2min50s. Four times an hour
to confirm the fault
Once
confirmation
un-resumable
34-1
Discharging temp.too
high protection
（
Td2
）
35-0
4-way valve reversing
failure
After 4-way valve is electrified for 10 minutes,if the below
conditions can be met for continous 10 seconds,that is conversing
successfully.
This outdoor compressor is running normally
Td1orTd2-Tdef1≥10
℃＆
Toci-Tao≤5
℃＆
Pd-Ps≥0.3MPa
Otherwise
，
the system alarms reversing failure
If it occurs 3 times in an hour,confirm the failure
Once
confirmation
un-resumable
35-1
4-way valve reversing
failure
After the start of the main outdoor machine 20min still have a child
of the four way valve is not on the electricity is reported 35-1 fault.
2 times an hour to confirm the fault
。
Once
confirmation
un-resumable
36-0
Oil temp.too low
protection
（
Toil1
）
In normal operation,if Toil
＜
CT+10
℃
for continuous 5 minntes,the
unit stop and alarm.2 minutes and 50 seconds later,resume
automatically.If it occurs 3 times in an hour,confirm the failure
Once
confirmation
un-resumable
36-1
Oil temp.too low
protection
（
Toil2
）
39-0
Low pressure sensor
Ps too low protection
After compressor is running(except for residual operation),if
in cooling,Ps
＜
0.01MPa or in heating
，
Ps
＜
0.05MPa for
continuous 5 minutes
，
alarm and stop
。
2 minutes and 50
seconds later
，
resume automatically
。
If it occurs 3 times in an
hour
，
confirm the failure
。
Once
confirmation
un-resumable