Hitachi YUTAKI Series - Maintenance; 10.1 Maintenance Work; 10.1.1 General Maintenance Procedure for the Outdoor Unit

Troubleshooting
Service Manual
184
Troubleshooting procedure
SMGB0066 rev.0 - 12/2009
 

↔


• ThealarmcodeisdisplayedonthePCB´sdisplay.
• Thecompressorstopsandrestartsautomaticallyin3minutes.
• Thealarmappearsafter3retriesduring30minutes.
– This alarm code is displayed when the suction gas temperature (Ts) is lower than -5ºC during 10 seconds. (Only
cooling operation).


Are the connector CN11
on the PCB2 and suction
gas temperature thermistor
correctlyconnected?
Wiring check and repair
No
Yes
Measure the temperature
of the position where the
suction gas thermistor
attached,bysurface
thermometer.
Is the temperature measured
and shown in segment
proper?
Yes
Checkthewaterowrate
(Check temperature of inlet and outlet)
No
Clogging of water strainer
Pump reverse rotating check
Check the air mixing
Are the connectors
between PCB1 and PCB2
correctlyconnected?
PCB1
CN9-CN1
PCB2
CN5-CN2
CN6-CN3
CN2-CN4
No
Wiringcheck,Repair.
(Breakingofwire,wrong
wiring)
Yes
Shortage of Refrigerant/ Gas leakage
Clogging of low pressure pipe
Clogging of expansion valve
Pull out connector
and measure thermistor
resistance.
Isresistancecorrect?
No
Replace thermistor
Yes
Check PCB2
Check water temperature (not excessively
low)
Malfundtion of check valve
Malfunction of expansion valve