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: 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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