Check connection on brown wire going from coach to the t'stat. Then check the one leaving t'stat going to control board/box..... then test. If water is cold, bypass the t'stat with a jumper wire. If it fires up, the t'stat is bad. If nothing yet, pull the connector on the control board, check for corrosion, clean and replace it. Then check both the connections on the ECO thermal switch. This should get you going, if not get back with your results. You could still have a bad board, ECO or gas valve.
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John & Clare Lyon
2007 43.5' Monaco Dynasty Palace III (All Electric)
Towd: 2011 Chevy Equinox
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