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Rinnai · Wall furnace

32 Room temperature thermistor short circuit

Medium severity EX DT

What the control is telling you

The manual lists this as a service-call fault: the room temperature thermistor circuit is shorted.

Applies to: Rinnai EnergySaver direct vent wall furnaces EX08DT, EX11DT, EX17DT, EX22DT

Likely causes

  • Room thermistor or its wiring shorted

Test and repair steps

  1. Turn the furnace off and back on with the ON/OFF button to try to clear the code.
  2. If the code stays or comes back on the next operation, a trained and qualified technician must service the unit.
  3. Technician inspect the part named in the code (room temperature thermistor short circuit) and its connections, and repair or replace as needed.

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Source: Rinnai EX08DT/EX11DT and EX17DT/EX22DT Installation and Operation Manuals (200000083, 200000084), Table 9 'Diagnostic Codes', p.35–36. Summarized in our own words; check the original manual for your model.

Homeowner looking at this code? See what it means for you and when to call a technician.

For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.