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heating problem

Postby duckybob2003 » Sat Nov 24, 2007 2:42 am

I have a white rodgers model 50a50-471 emerson electric heating unit
it has a builtin diag system in it and will flash a fault code when somthing is wrong. Mine at this time is flashing a code 4 which means-thermal detection device open anybody out there can tell me what this means.
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