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.
Carrier air conditioning error code eo ol 1 time indoor unit eeprom parameter error.
The causes for this could be a wiring mistake or a faulty control board with the indoor unit or the outdoor unit.
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E1 ol 2 time indoor outdoor units communication error.
If you re handy with electronics you may be able to fix these problems but if not it s time to call a pro.
E3 ol 4 time the speed of the indoor fan has gone out of control.