Carrier 40MBFAQ Service Manual page 21

40MBFAQ: Service Manual
DIAGNOSIS AND SOLUTION (CONT.)
EH 60/EH 61/EC 53/EC 52/EC 54 (Open Circuit or Short Circuit of Temperature Sensor
Description: If the sampling voltage is lower than 0.06V or higher than 4.94V, the LED displays a failure.
Recommended parts to prepare:
• Connection wires
• Sensors
• PCB
Troubleshooting
NOTE: For certain models, the outdoor PCB cannot be removed separately. In this case, the outdoor electric control box should be replaced
as a whole. This images in this manual and the values are only for reference. Actual appearance and values may vary.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Check the connection between
the temperature sensor and the 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)
NO Ensure proper connections.
NO Replace the sensor.
21
Diagnosis and Solution)