15
ICE A/C & HEX Combo Unit I&O Manual 07/2020 Rev.1
Chapter 5: Troubleshooting
5.1 Troubleshooting Guide
Symptom
Possible Cause
Solution
Unit Doesn’t Start
Open circuit or short
circuit
Check the open circuit or short circuit point, and
maintain the main power supply
Controller failure
Replace controller
Internal fan
doesn’t start
Terminal is loose
Check whether the connecting terminal is loose.
Power failure
Check the DC input power voltage, whether the
voltage is in the range
Fan is blocked
Check whether there is foreign matter blocking
the fan
Internal return Temp.
is too low
Check whether the internal return Temp. is lower
than the internal fan stop point. If so, the internal
fan will.
External fan
doesn’t start
Terminal is loose
Check whether the connecting terminal is loose
Power failure
Check the DC input power voltage, whether the
voltage is in the range
Fan is blocked
Check whether there is foreign matter blocking
the fan
No energy-saving/
cooling requirement
Check the detected internal Temp. and the exter-
nal fan status through the display interface
Fan has abnormal
noise
Bearing wear
Replace fan
Fan impeller in
contact with other
parts
Check whether there is interference between
cables and fan impeller
Compressor
doesn’t start
Electrical connecting
is loose
Tighten the electrical connector
Power is off
Check the main power supply switch, and check
whether the interface display ”Starting”
Power failure
Check the AC input power voltage, whether the
voltage is in the range
Compressor motor
damaged
Replace compressor
No cooling
requirement
Check the detected internal Temp. and the com-
pressor status through the display interface
Delayed startup
The delayed time of compressor interval startup
is 3 minutes
Compressor internal
thermal protection
Check whether the contact of compressor protec-
tor is open
High pressure switch
open
External ambient Temp. is too high or external
cycle air flow is not enough and check whether
the contact of high pressure switch is open
Poor cooling
efficiency
External cycle air
flow is not enough
Clean the impurities existing in coil or air inlet
Table 7. Troubleshooting Guide
