F5 / EC 07 - Error Code Diagnostic

Modified on Thu, 17 Oct at 12:16 PM

If error codes F5 or EC 07 appear on your indoor unit, it means that the outdoor

fan speed is not operating within the normal range.


During Initial Start-Up and Commissioning:

• Check the connections between the fan motor and the outdoor control

board.

• Inspect for any obstructions that may be preventing the fan motor from

spinning.


If the System Has Been Commissioned but Now Displays the Error Code:

Please switch off the unit at the breaker, wait for 2 minutes, and then turn it back on. If the error

code still appears, follow these steps:

1. Check the connections between the fan motor and the outdoor control board.


2. Look for any obstructions that might be stopping the fan motor from spinning. If

any are found, remove the obstruction and restart the unit.


3. Try to manually rotate the fan blade. If you feel resistance or if the motor's

bearings are rough and do not spin smoothly, the outdoor motor needs to be

replaced.


4. While the outdoor unit is on standby, measure the voltage between pin-1 and

pin-3, as well as pin-4 and pin-3, on the fan motor connector on the indoor control

board. If the measured voltages do not align with the values in the chart below, the

indoor control board needs to be replaced.


5. The Outdoor DC Fan Motor (control chip is located on the outdoor PCB)

Disconnect the UVW connector and measure the resistance between U-V, U-W,

and V-W. If the resistances are not equal, the fan motor is faulty and needs to be

replaced. If the resistances are equal, then the issue lies with the PCB, which will

need to be replaced.


DC motor voltage input and output of the outdoor unit



To order a replacement part or to get further assistance in diagnosing your unit, please contact one of our support representatives by submitting a ticket using the link below.


Submit a Ticket



*Please note these procedures must be performed by a certified HVAC contractor.

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