Hitachi YUTAKI Series - Page 194

Troubleshooting
Service Manual
192
Troubleshooting procedure
SMGB0066 rev.0 - 12/2009
 

↔
1

• ThealarmcodeisdisplayedonthePCB´sdisplay.
– This alarm code is displayed when the chilled water temperature is lower than 2ºC.

Is connector 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 Outlet)
Check 4-way valve