SOURCE: Ruud UBHC-21J18SFA blowing only "luke warm" air at best
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.
SOURCE: What air filter size fits a Ruud model UBHC
well go to the forced air unite and open up the fan compartment and measure the size. or find out the air returns and there should be filter in there.
SOURCE: RUUD UBHC-17J14SFA HEATING PROBLEM
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)
SOURCE: Ruud Furnace Model# UBHC 14J11NFA runs
Check your fan selector. If it is on 'ON' place it on auto.
SOURCE: Trying find a part # for my Ruud Return Filter
measure the old filter and go to the hardware store and buy one
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