Service Manual

 Troubleshooting 25 
7.5 E4/E5/F1/F2/F3 (Open circuit or short circuit of temperature sensor diagnosis and
solution)
Description: If the sampling voltage is lower than 0.06V or higher than 4.94V, the LED will display the failure.
Recommended parts to prepare:
• Connection wires
• Sensors
• PCB
Troubleshooting and repair:
Check the connection between
temperature sensor and PCB.
Replace indoor PCB((E4/E5) or
outdoor PCB(F1/F2/F3)
Is it within acceptable
parameters?
Is it properly wired?
Ensure proper connections.
NO
Measure the resistance value
of the sensor.
YES
Replace the sensor.
NO
YES
Note: For certain models, outdoor PCB could not be removed separately. In this case, the outdoor electric
control box should be replaced as a whole. This picture and the value are only for reference, actual appearance
and value may vary