Carrier 40MBFAQ Service Manual page 18

40MBFAQ: Service Manual
DIAGNOSIS AND SOLUTION (CONT.)
EH 03/EH 31/EH 32/EC 07 (Fan Speed Is Operating Outside of Normal Range Diagnosis and Solution)
Description: When the indoor / outdoor fan speed remains too slow or too fast for a certain amount of time, the unit ceases
operating and the LED displays the failure.
Recommended parts to prepare:
• Connection wires
• Fan assembly
• Fan motor
• PCB
Troubleshooting
Power off then restart the unit after 2 minutes.
Shut off the power supply , Rotate
the fan motor from the PCB.
Is it within normal parameters?
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.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Does a problem remain?
YES
the fan by hand .
Does it turn easily?
YES
Check the fan motor wiring.
Is it improperly wired?
YES
Measure the voltage for
YES
Replace the fan motor.
NO The unit is operating as designed.
NO Identify the problem and resolve.
Ensure proper connections.
NO Replace the main PCB.
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