Activation Of Freeze Protection Control - Hitachi RCUE40AG1-400AG1 Service Manual

[] Activation of Freeze Protection Control
!
This alarm code is indicated when the water inlet or outlet temperature is lower than 2°C.
Is connectors on the Printed
Circuit Board correctly connected?
PCB :CN4,CN6,CN7,CN3
C
PCB :CN23Te2
D
Yes
Pull out connector and measure
thermistor resistance
Is resistance correct?
Yes
Check printed circuit board
No
Plug correctly and
No
Replace Thermistor
Yes
Thermistor
resistance
(KΩ)
Thermistor for Water Temperature
repair wiring
Temperature (°C)
characteristics
TROUBLESHOOTING
Check water flow rate (Check the
temperature of Inlet and Outlet)
Check pump reverse rotation
Check water strainer clogging
Check air mixing
Check Chilled water thermostat
setting value (It shall be within
the working range)
1
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