If an e1 error code shows up in your air handler that means there is a communication error either with the indoor unit or the outdoor unit.
Carrier ac indoor unit displays error code e1.
E1 ol 2 time indoor outdoor units communication error.
The causes for this could be a wiring mistake or a faulty control board with the indoor unit or the outdoor unit.
Other causes for an e1 error code include loose internal connections a communication problem between the indoor and outdoor parts of the unit and a faulty control panel.
Troubleshooting an e1 error code.
E3 ol 4 time the speed of the indoor fan has gone out of control.
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