Are you popping a breaker on a 15A line inside the RV, or are you popping a breaker on the outside pedestal? The microwave, water heater, and fireplace are all high current devices - and should not all be on the same inside breaker. The microwave should be on its own breaker, probably a 15A breaker, but if it shares a breaker with other outlets then it will likely pop a 15A breaker if another high current load (coffee pot, toaster, etc) is added.
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Alan Hepburn - San Jose, Ca
2007 Bounder 35E being pushed by a 2020 Jeep Gladiator Sport S or a 2022 Jeep Wrangler Unlimited (JLU) Sport S
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