Reznor Heater Problem

[Piedmont]

I have a UDAP model 45 brand new and I'm having problems. The LED code indicates a open high limit switch but I can't determine how it can be closed. I have turned off the power to the heater and ran it through the start up cycle. It runs fine for 10-15 mins then then flames out and the fan continues to run. The only way to stop the fan is to set the thermostat all the down. Any suggestions?

 

[MXRACER]

I had the EXACT same problem and my polarity was reversed. This is a Reznor issue only from what I am told.

Please let me know if this fixes it !!!

 

[Piedmont]

MX thanks you! What step do I need to follow to diagnose the problem?

 

[MXRACER]

Be sure the polarity is correct on your 110 power cord.

 

[MXRACER]

Any News ??????