Some RV water heaters have 2 thermostats for each heat source (one for overtemp and one for switching on heat)for gas and elect. under the insulation against the tank, some use only 2 'stats for both sources, but the insulation is what holds it against the tank. Often these will either vibrate or fall away from the tank, resulting in poor temperature control. None I've seen are adjustable, but they do come for different temperatures. I have read about an aftermarket adjustable 'stat.
To reach these, remove the access panel, gently pull the insulation apart to find the 'stats.
After you are finished, replace the insulation evenly, making sure the 'stats are firmly against the tank. since your water is only warm, I suspect a defective
stat.
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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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