4 Troubleshooting
- 46 -
Fault
Code
Fault Description
Possible Cause
Solution
A70
Pre-warning of
pressure sensor 1
1) The pressure sensor is
connected with the tem-
perature sensor cable by
mistake.
2) The setting of P2 pres-
sure range does not meet
requirements of the
pressure sensor.
3) A8-10 [Stop pressure
setting value (protection
pressure)] and A8-11
(Pre-warning pressure
setting value) are set to
small values.
4) The pressure sensor is
abnormal.
1) Connect the pressure sensor cable
correctly.
2) Set the P2 pressure range accord-
ing to the requirements of the
pressure sensor.
3) Set A8-10 [Stop pressure setting
value (protection pressure)] and
A8-11 (Pre-warning pressure
setting value) based on actual
requirements.
4) Replace the faulty pressure sensor.
Err71
Overpressure of
pressure sensor 1
Err72
Overtemperature
of temperature
sensor 1
1) The temperature sensor
is connected with the
pressure sensor cable by
mistake.
2) The sensor temperature
is too high due to poor
heat dissipation.
1) Connect the temperature sensor
cable correctly.
2)
Check whether the air filter is
clogged and the cooling fan ro-
tates in the reverse direction.
A73
Pre-warning of
temperature sen-
sor 1
Err74
Pressure sensor
disconnection fault 1) The pressure sensor
wiring is abnormal.
2) The pressure or tempera-
ture sensor is abnormal.
1) Check the wiring.
2) Replace the faulty pressure or
temperature sensor.
Err75
Temperature sen-
sor disconnection
fault
A76
Air filter mainte
-
nance pre-warning
The value of A8-28 (Air filter
running time) reaches that of
A8-23 (Air filter maintenance
setting time) in maintenance
parameters.
Maintain the air filter and clear A8-28
(Air filter running time).
A77
Oil filter mainte
-
nance pre-warning
The value of A8-29 (Oil filter
running time) reaches that of
A8-24 (Oil filter maintenance
setting time) in maintenance
parameters.
Maintain the oil filter and clear A8-29
(Oil filter running time).
A78
Oil/Gas separa-
tion maintenance
pre-warning
The value of A8-30 (Oil gas
separating running time)
reaches that of A8-25 (Oil
gas separating maintenance
setting time) in maintenance
parameters.
Maintain the oil and gas separator and
clear A8-30 (Oil gas separating running
time).
