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A C code just indicates where in the cycle an error occurred. It's not the actual error. You should get another number following the C7. If you don't then try powering the unit down wait a minute then power it back up and tell me what happens.
A 76 error indicates a problem with the remote control.
Check the electrical connections at both ends of the remote cable. Then bypass the cable and connect the remote directly to the unit. The next step would be to replace the remote