ACPro Y Series Troubleshooting Manual page 27

7.4 EH 60/EH 61/EH 62/ EH 65/ EC 53/EC 52/EC 54/EC 56/EC 57/EC 50/EC 5C (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 displays the failure.
Recommended parts to prepare:
• Connection wires
• Sensors
• PCB
Troubleshooting and repair:
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
Check the connection between
temperature sensor and PCB.
Is it properly wired?
YES
Measure the resistance value
of the sensor.
Is it within acceptable
parameters?
YES
Replace indoor PCB((E4/E5) or
outdoor PCB(F1/F2/F3)
Troubleshooting 27
NO Ensure proper connections.
NO Replace the sensor.