Mars DVH Series - Page 39

Service Manual - DVH 09/12/18/24 SF Series
Service Manual - DVH 09/12/18/24 SF Series
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9.3.5 Open circuit or short circuit of temperature sensor diagnosis and solution (E5)
Error Code
E4/E5/F1/F2/F3
Malfunction conditions If the sampling voltage is lower than 0.06V or higher than 4.94V,
the LED will display the failure.
Possible causes ● Wiring error
● Sensor faulty
● PCB faulty
Troubleshooting:
Check the connection
between temperature
sensor and PCB.
Correct the connectionNo
Yes
Replace indoor or outdoor
main PCB
Measure the resistance
value of the sensor
Replace the sensorNo
Yes