Hermistor Diagnostic Flow - Sanden GAU-A45HPA Service Book

Error
Error Contents
Code
E150 INV Serial
Communication Error

hermistor Diagnostic Flow

T
Check temperature in
Parameter Display Mode
Check thermistor resistance
Normal
Contact error between Thermistor connector and MCS
Error Detection Condition &
Diagnostic
Communication error detected in
compressor operation control
<Check Items>
- Wiring layout is not following
instruction
- noise source is near harnesses
- PC board malfunction
Error
Normal
Error
Sanden Heat Pump –– Service Technical Book
Check Points
Connector
No. or Connector
Maintenance Colour
Monitor No.
Wire break or short circuit of thermistor harness
Error in thermistor device
MCS Error
Page 35 of 48
Judgment & Repair Methods
- Confirm connector connections
- Stop operation of all the
surrounding electrical products and
reboot Heat Pump
- PCB replacement required if same
error occurs again after re-run of heat
pump