By pass the wall stat, pull the 2 wires off stat and twist together and if unit runs ok it is the stat if it does the same thing by pass the stat wire by disconnecting the stat wires from the valve a put a jumper wire between the (th) terminals.
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By pass the wall stat, pull the 2 wires off stat and twist together and if unit runs ok it is the stat if it does the same thing by pass the stat wire by disconnecting the stat wires from the valve a put a jumper wire between the (th) terminals.