Water system error and flow type
volume controller short connection
Check water system
Hi-voltage or Lo-voltage, signal phase
or phase unbalance
Short circuit comes out from motor or
connecting interface
Overcurrent assembly error
Over high or over low voltage
Component error
Lo-voltage switch error
Excessive low air suction pressure
Filter in front (or rear) of expanding
valve is blocked
Check the integrated temperature sensor after motor is cool down.
Over high air expelling pressure or
excessive low air suction pressure
See “Over high air expelling pressure” and “excessive low air
suction pressure ”
Replace a new one
Confirm voltage not higher or lower than the rated voltage 20V
Liquid refrigerant flows into compressor
from evaporator result in liquid slugging.
Coils in contactor are burnt out
Wrong connection of phase sequence
Error signal delivered from wire controller
4-way valve or thermal resistor error
Air loop short-circuit
Fixing screws at panel are loosen
Overcurrent relay trip up, fuse burnt out
Aging of compressor
See “Excessive low air suction pressure”
Replace a new compressor
Replace damaged assembly
Control circuit without power though
Check the wring of control system
Hi-voltage or lo-voltage protection
Reference to mention in above the parts of air suction and discharge pressure error
Replace damaged assembly
Find out the error type and carry out the corresponding measure to settle
Check the running state. Replace a new one if necessary.
Settle the short-circuit of air discharge
Fix up all assemblies
Re-connect and adjust the any 2 wires among 3 phases
Adjust refrigerant charge volume
Replace a new filter
If the switch is defective, please replace a new one.
Confirm resistors at motor are connected corresponding to terminals
Confirm voltage not higher or lower than the rated voltage 20V
Compressor stops
because of motor
Overcurrent.
Compressor stops
because of integrate
temperature sensor
or air discharge
temperature protection.
Compressor stops
because of Lo.-pressure
protection
Abnormal noise gives
out form compressor
Compressor is unable
to drive
Air side heat exchanger
excessive frost
With noise
Over high air expelling pressure and
air suction pressure
See “Over high air expelling pressure” and “Over high air suction pressure”
Error
Possible reason
Detect and settle measure
22
I&O manual
Table 7-1
