Error code reference

Frigidaire Dryer Error Code E91

Communication Error between Electronic Control Board and Interface Board, or wiring defective.

First step from the service manual

Check connections between Electronic Control Board and Interface Board. If no wiring problems, replace Electronic Control Board or Interface Board.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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E91 on my Frigidaire Dryer

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Communication Error between Electronic Control

From Service Manual 889341, p.33:

1.Check connections between Electronic Control Board and Interface Board. If no wiring problems, replace Electronic Control Board or Interface Board.

2.Inspect the communication harness between the main control and the UI board for bent pins or unseated connectors at each end.

3.Measure supply voltage to the UI board. Expected: 5 VDC at the interface connector; a low or missing rail points back to the main control supply.

Part 5304504863

Display board

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