Trips house gfi when closed

[rmfuke]

I have my 2619 parked at my daughters in Arkansas and am on the way down to see them. I asked my son in law to hook up the TM to the house current to get the refrigerator to start cooling. He says it trips the outlet gfi every time. Son in law doesn't know how to open and set it up.

When we were last there in April the gfi didn't trip when the TM was opened. Never tried hooking up to electric when closed before this. Any thoughts? I hate to have a hot refrigerator when we get there Tuesday July 3 but it looks like we will.

Thanks