PDM20 Series
-49-
Fault
code
Fault type Possible reasons Solution
E025
Running
time
reaches set
time
1．Running time reaches set time 1．Seek for service
E026 Reserved Reserved Reserved
E027
Water
shortage
alarm
1．Water pressure/level exception
1．Check whether the pressure of
inlet is abnormal or not
2．Sensor broken line or poor
contact. System has no feedback
signal
2．Check the installation and wiring of
sensor
3．Water shortage alarm detection
time is too short（P0.29）
3．C heck relevant parameter settings
4．Water shortage protection
frequency is too low(P0.27)
5．Water shortage protection
detection current is too
low(P0.28)
E028
High
pressure
alarm
1．Feedback signal of senor
exception
1．Check the wiring of sensor
2．High pressure alarm value
adjustment is too low（P0.21）
2．Check relative parameter settings
3．Alarm detection time
adjustment is too short（P0.22）
E029
Low
pressure
alarm
1．Low pressure alarm value is
set too high（P0.23）
1．Modify parameters
2．Sensor broken line or poor
contact. System has no feedback
signal
2．Check the sensor
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