What should I check first if the washer/dryer does not operate properly?

Check that the electric supply is connected, the house fuse or circuit breaker is intact and tight, and that the washer lid or dryer door is fully closed. Also verify that the controls are set to a running or 'ON' position, the dryer start button has been firmly pushed, the shipping strap has been completely removed, and the gas shutoff valve is open in the supply line. (Page 7)

From the official Whirlpool Thin Twin manual, page 7

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