I'm getting the blinking locked door light and error code e48

E48
Control detects a problem with the door lock circuit.

Unplug the washer. Check the wiring harness going to the door lock assembly. If the wiring harness is sound, the door lock/switch assembly usually needs to be replaced.

EGR Valve issue (Exhaust Gas Recirculation)

https://www.google.com/search?q=1992+Cadillac+DeVille+Sedan.+error+code+E48

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Those blinks [flashes] are fault indication (Error Codes) and the E48-D0 is the fault code. From the number of blinks occur at one time switch ON, you can get an idea about the faulty circuit section inside it. This will make repair easy. These are called blinking codes. Make sure about the exact number of blinking of the standby/power LED, by switching On & OFF the set, for at least two times. Count it carefully. If you wish to get some details, check the site linked here. It has details about blinking codes, and fault locating procedure, to many popular brand TVs and other devices.
http://electro-medical.blogspot.com/
http://homenol.blogspot.com/
http://electronicshelponline.blogspot.com/
If blinks continue without any pause, the main board is faulty.

Hi Roger, Hope this helps......CHEERS..

KENMORE DISHWASHER ERROR CODES

Kenmore Dishwasher Error Code = Start Resume light blinking slow
When the dishwasher door opens or electrical power is removed during the cycle then the dishwasher will not start again. The door is detected as being closed and the Start Resume button is being pressed
Kenmore Dishwasher Error Code = Clean light is blinking 7 times
Heater circuit fail. Control panel did not detect the water getting hot. Did not detect heating element was energized to heat the water during the wash cycle
Kenmore Dishwasher Error Code = Sanitize LED blinking at end of cycle
Control panel could not detect if sanitation has been achieved
Kenmore Dishwasher Error Code = Console light blinking rapidly
There is a stuck button on the control panel
Kenmore Dishwasher Error Code = Clean light is constantly illuminated
Dishwasher cannot start a wash cycle until it sees that the door has been opened after the previous washing cycle
Kenmore Dishwasher Error Code = Control lock LED is ON but not responding to pressing of the keys
Turned on by accident or there is a control detected key pad problem

Good Morning Joseph, thank you for your inquiry!
From what you have described your Frigidaire washer is displaying an error code of "48" and you would like to fix the issue. An "E48" error code stands for your control board thinking the door is closed. This could be a possible problem with your door lock assembly or the control panel. You may want to check the door latch to make sure there is no visible damage or loose wires. I would recommend consulting with a professional for proper repairs if the latch is not damaged. I hope this information is helpful. -Matt

Hello Nick Jensen, thanks for your post!
From what you have described your Frigidaire washer is displaying an error code of "E48" and you have changed the control board with the problem continuing to be present. An "E48" error code could be a possible problem with your door lock assembly, motor control board, or control panel. Because it could be a number of any one of several underlying causes, I would personally contact a professional to accurately diagnose your washer to determine the root cause to reduce the risk of unnecessary parts. I hope this is helpful. -Matt

https://tvandvideodoctor.co.za/dstv-message-error-codes-e48-32-e143-4

Remove the door lock assy. and check the resistance. If it is shorted or open you need to replace the lock assy. If not then it's the Main Control board.

Good Morning Gerald, thank you for your question!

If you are getting an error code E48, it usually means that the board thinks the door PTC (positive temperature coefficient) circuit is closed. This particular part is the wax motor on the door lock. One of the best ways to determine if this is a false error code is to reset the power to the appliance by either unplugging it or flipping off the breaker for about ten minutes. If the error code persists, it would be advisable to contact an experienced appliance repair tech to assist further.

Best regards!

E47 and E48 are door lock error codes, also check the wire harness connections too.