Reznor UBZ User Manual (English)

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Questions and Answers:

D
Darrell HoffmanAug 10, 2025
How to troubleshoot a Reznor Heater venter motor that will not start?
- J
  Jimmy HarrisonAug 10, 2025
  If the venter motor on your Reznor Heater won't start, begin by ensuring the unit has power and checking the supply fuses or circuit breaker. Next, verify that the thermostat is turned up to supply 24V power to the integrated circuit board. Check the control transformer output. Inspect the integrated circuit board fuse and replace it if blown (3A, type ATC or ATO, 32VDC) after correcting the cause. Tighten connections at the circuit board and/or motor terminals to ensure power is reaching the venter motor. If these steps don't resolve the issue, the integrated circuit board or the venter motor itself may be defective and require replacement.
A
Alexander MurphyAug 16, 2025
What causes the fan or venter motor to not run in my Reznor UBZ?
- W
  Wanda SheppardAug 16, 2025
  If the fan or venter motor on your Reznor Heater will not run, check the wiring and connections for any open circuits. If the wiring is intact, the integrated circuit board or the motor itself may be defective and require replacement.
R
Rachel WilliamsAug 25, 2025
Why does my Reznor Heater burner keep cycling ON and OFF?
- N
  Natalie WrightAug 26, 2025
  If the burner in your Reznor Heater cycles on and off, the gas pressure might be too high or too low; ensure it's at 5–14 IN WC for natural gas or 11–14 IN WC for propane. Check that the burner and circuit board are properly grounded. If 24V power is available to the integrated circuit board and all other causes have been eliminated, replace the board. Make sure the unit is properly vented, removing any obstructions, and replace any faulty tubing to the pressure switch. Replace the pressure switch if it's faulty. Check that the flame sensor lead isn't grounded and that the sensor insulation or ceramic isn't cracked; replace if needed. If the polarity is incorrect, reverse the line volt leads to the integrated circuit board. Finally, replace the wire harness if a pin terminal is loose.
A
Angela RodriguezAug 30, 2025
Why does the fan or venter motor cut out on overload in my Reznor UBZ Heater?
- M
  Mrs. Melissa HansonAug 30, 2025
  If your Reznor Heater's fan or venter motor cuts out on overload, ensure the electric supply voltage is correct. If the voltage supply is not the issue, the motor may be defective and require replacement. Poor airflow can also cause this issue, so clean the motor, fan, and fan guard.
J
Julie SmithSep 4, 2025
Why does the fan or venter motor turn ON and OFF while the burner is operating on my Reznor UBZ Heater?
- S
  Stefanie ZavalaSep 4, 2025
  If the fan or venter motor in your Reznor Heater turns on and off while the burner is operating, the motor overload device might be cycling. Check the motor load against the motor rating plate, and replace the motor if needed.

Reznor UBZ Specifications

General

Type	Unit Heater
Fuel Type	Natural Gas or Propane
Thermal Efficiency	80%
Dimensions	Varies by model
Weight	Varies by model
Ignition	Direct Spark
Mounting	Ceiling
Gas Connection Size (NPT)	1/2" - 1"