Hi Phil,
I'd check thermostat first. They are not expensive or difficult to change and I'd guess the one in your coach dates back to 1989! Were they still using several LP furnaces or one full-coach heating system on that coach?
Dean
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1993 Newell 45'#316, 1976 Trans Am 455, 1967 GTO, 1953 Chevrolet 3105 (panel truck),1952 Chevrolet 3600,1969 Airstream Overlander. Always fixing something!
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