Hitachi YUTAKI Series - Page 195

193
Troubleshooting procedure
SMGB0066 rev.0 - 12/2009
Troubleshooting
Service Manual
7
 
1

• ThealarmcodeisdisplayedonthePCB´sdisplay.
– This alarm code is displayed when the water temperature is above 59ºC during compressor operation. (Only heating
operation).
 

Are connectors CN9 and
CN13 on the PCB2 correctly
connected?
Wiring Check
(Breakingofwire,wrong
wiring)
No
Yes
Is the actual water
temperature and the
temperature shown in
segmentproper?
Yes
No
Check pump reverse rotation
Check water strainer clogging
Check 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
Pull out connector
and measure thermistor
resistance.
Isresistancecorrect?
No
Replace thermistor
Yes
Check PCB1 and PCB2
Checkthewaterowrate
(Check temperature of inlet and outlet)
Check chilled water thermostat setting value
(It shall be within the working range)