If your Frigidaire Dishwasher displays I50 error, then there is an issue either with its washing motor or its drain system.
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On the older models, the ones without any display, when the End bulb flashes five times, it means you are getting the I50 error.
This error code also indicated that here might be an issue with the machine’s pump or control module. All these issues require a professional’s assistance.
So it is recommended to not dive directly into fixing this issue, without seeking a professionals’ help.
You should however turn off the machine for almost 15 minutes and unplug it from the power source.
If it displays the same error again after restarting, turn off the machine again for 5 minutes. This is the only method you should try in this case, if this doesn’t work, call a professional.