Carrier DHMVHA Service Manual page 23

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DIAGNOSIS AND SOLUTION (CONT.)
The Outdoor Fan Speed is Operating Outside of Normal Range (EC07)
Error Code
Malfunction decision conditions
Supposed causes
Troubleshooting
Power off, then restart the unit after 2 minutes.
Shut off the power supply, rotate
NOTE: For certain models, the outdoor PCB can not 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.
EC07
When the outdoor fan speed runs too low or too high for a certain time, the LED displays the failure code
and the AC turns off.
Connection wires
Fan assembly
Fan motor
Outdoor main PCB
Does a problem remain?
YES
the fan by hand.
Does it turn easily?
YES
Check the wiring of fan motor.
Is it improperly wired?
YES
Measure the voltage for
the fan motor from the PCB.
Is it within normal parameters?
YES
Replace the fan motor.
NO The unit is operating normally.
NO Find the cause of the problem and resolve it.
Ensure proper connections.
NO Replace the outdoor main PCB.
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