Question about Ruud UBHC Air Conditioner

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Furnace blows hot air for the first 5-10 minutes only, then air is barely warm

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You may have airflow issues, verify the inlet and outlet temps with the unit running on start up, if the unit exceeds the "rise" allowable then the safety devices "overtemp" will take the firing circuit off line until it cools down. The acceptable mfg. rise is listed on the nameplate inside the burner chamber, (generally on the side wall)

Posted on Jul 20, 2009


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In most newer operations, the indoor fan motor will come on first before the actual heat comes on.
However if you shut off the power and Remove usually
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Usually this requires a thermometer that you can insert about 5ft away from the furnace, for both
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If the temperature rise calls the unit to be between 25
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That's crazy, we're having the same problem.  Turns out there was a wattage restrictor in the furnace that was switching off 3 of the 5 heating elements in an attempt to save energy.  Basically, the restrictor was sensing that the incoming air was warm, so only 2 of the 5 coils should be needed to heat the air.  Well that wasn't enough and we just sat with the furnace running all day long struggling to reach the 70 degree setpoint. 
This is something a technician can diagnose in a few minutes, but not the sort of thing a DIY'er should really handle.

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