My Kitchenaid microwave oven has an error code F2 E1. According to what I have read on this site it is a keyboard issue. The microwave is built into a cabinet. Can this be fixed?

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Did you get the circuit board from a trustworthy place?
It is a circuit board error. Did you install it correctly - right wires to right connections?
Control displaying F2 E1:
There may be a problem with the User Interface (Touchpad), or the associated wire connectors.
Power unit down by turning off the circuit breaker(s) for one (1) minute.
Power unit up by turning on the circuit breaker(s).
Monitor the oven for one (1) minute to ensure the error code does not display again.
Verify oven operation
Have to go the long way to bring up the link by first:
e1 f2 whirlpool oven Google Search
and then click on https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0ahUKEwjprvf2_7nJAhXKVRoKHe7zAmMQFggdMAA&url=http%3A%2F%2Fwww.whirlpool.com%2Fproduct-help%2Ferror-code-oven-f2-error-code-f2-e1%2FPH7389%2F&usg=AFQjCNFoDK8E-zgNHF3Kp4EoihGu1tbyEw

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F2 - E1
Keypad cable unplugged
1.
Check keypad connector for firm connection (keypad connects to control
board).
2. Press CANCEL. If error code returns after 60 seconds, replace
keypad (also called touch pad or membrane switch). Some models incorporate
keypad in to control board as one unit. In this case, replace control board
(also called ERC or clock).

F1 - E1
EEPROM checksum error

1.
Disconnect power for at least 30 seconds.
2. Re-apply power and observe for
at least one minute.
3. If code re-appears, replace control board (also
called ERC or clock).

Note: Applies to all F1-E...
codes except F1-E3.

F2 E1 means that the keypad cable is unplugged.
Gain access to the control panel and keypad. Check keypad connector for firm connections. Keypad connects to the control board. Press CANCEL. If error code returns after 60 seconds, the keypad needs to be replaced. If your control board and keypad are incorporated as one unit, then the control board needs to be replaced.

This is not exactly a solution, but it does explain what F2:E1 means. According to this page, it is a control panel malfunction. It may be caused by a shorted wire, but it may just be the control panel malfunctioning on its own.

door switch may need to be replaced.

This is information from the Tech Sheet.

Fault Code F2 - Error Code E1: Code Explanation: Keypad keytail not connected. Recommended Repair Procedure: 1. Check keypad connector for firm connection. 2. Press CANCEL. If error code returns after 60 seconds, replace keypad. 3. Replace control.