Kaisai KHX-14PY3, Owner'S Manual

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7. Failure List & Troubleshooting
7.1.
Failure Handling
Issue Possible cause Related components Solution
Unit tripped when
powered on
Short circuit
Terminals Relays
Contactors cables
Check all the components’ connection
Check relays and contactors whether are broken
Disconnect the electronic components one by one
and powered on to find the problem
Display cannot get
power
Cables has disconnected
The power input cable is
mis-connected
Display cable Power input cable
Check the display cable
Check the power cable
Check the 3-phase power cable whether connected in
right phase sequence
Cannot start up the unit
The unit have error Cables
has disconnected
Display Cables
Check the display whether shown error Check the cable
Reconnect the power cable and check if it works
Display cannot work
The display has been
locked The display is
broken
Display
Check the display whether shown locked icon
Check the cable
Reconnect the power cable and check if it works
Heating effect is not
good
The compressor running
low frequency The fan
is not running or speed
is too low
Leakage problem
Compressor Fan
Refrigerant system
Check the compressor frequency Check the fan speed
Check the exhaust temperature and low pressure
Shut off while didn’t
reach the target
temperature
Temperature limit
(according to ambient
temperature) Control logic Check the parameters
The evaporator has too
much frost and cannot
defrosting cleanly
Fan blade or motor issue
EEV step is not suitable
Refrigerant amount issue
Parameter issue
Parameters Fan EEV
Refrigerant system
Check the defrosting parameters Check the compressor
frequency Check the fan speed
Check the exhaust temperature and low pressure
Abnormal noise
Screws issue
Fan blade or motor issue
Compressor issue Compo-
nents have collision
Screws Fan
Compressor
Other components (tubes, cables)
Check the screws
Check the fan blade and motor Check the compressor
Check other components