Rinnai 32 Error Code: Outgoing thermistor
Updated October 2026 · Sourced from Rinnai documentation
🛑 Turn it off and call a licensed pro
The outgoing water temperature sensor has a fault. The manual lists checking sensor wiring, measuring resistance, cleaning scale and replacing the sensor.
Is it safe to keep running? No. Turn it off and get it checked. Call a trained and qualified professional (or Rinnai customer support). Do not open the unit.
32 at a glance
| Code / how it shows | Meaning | Applies to |
|---|---|---|
| 32 Code shown on the temperature controller display | Outgoing thermistor | SENSEI N Series residential condensing: RU199i, RU180i, RU160i, RU130i (indoor) and RU199e, RU180e, RU160e, RU130e (outdoor) |
Check this first
Only steps a homeowner can do safely. Do not open electrical panels or the burner area.
- Turn power off, wait, then back on.
🛑 Stop and call a licensed pro if
- Call a trained and qualified professional (or Rinnai customer support). Do not open the unit.
- You smell gas. Leave the house, do not touch switches, and call your gas utility from outside.
- Codes for flame failure, overheating, venting or the control board that return after one reset.
- Water leaking from the heater, the relief valve discharging, or scorching around the burner area.
- A carbon monoxide alarm sounds. Get everyone outside and call 911 or the fire department.
Safe first steps for any Rinnai code
- Write down the exact code shown on the controller or the number of status light flashes.
- Turn the water heater power off and back on (or press the reset button the manual describes) once. If the code comes back, stop resetting.
- Make sure the gas supply valve to the heater is open and other gas appliances in the home are working.
- Make sure the cold water supply valve is fully open and hot water taps are not partly closed.
- Look at the outside vent terminal for snow, ice, leaves or anything blocking it (look only).
Source: Rinnai SENSEI N Series Residential Installation and Operation Manual (100000467), 5.6 Diagnostic Codes, p.74. Codes are series-specific, so your unit's own manual is the final word. Reviewed October 2026.
Ryan Giles · Red Seal Certified Plumber · Ask a plumber · Ask an HVAC technician
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