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1) Do you have a GFCI circuit breaker or a GFCI receptacle?
2) Is the timer hard-wired to the GFCI or plugged in? If plugged in or hard-wired, remove the LOAD side terminations or un-plug the timer and reset the GFCI. Does it still trip under a "no load" condition?
3) Do you have either a 2 wire lead AC voltage tester (a contact type) or an AC voltmeter available to confirm voltage?
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