A 20 minute delay is horsehocky, the normal built-in delay is 2 minutes, 3 minutes at most. Ask them to turn it on, record time, and call you when it's running and the RV is cooling. When you arrive have them measure amperage draw while the unit is running, anything over 16A means the unit is failing or they have low voltage.
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2000 Winnebago Ultimate Freedom USQ40JD , ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA. " My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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