Rinnai Error Code 35: Overheat temperature thermistor 2 short circuit (Wall Furnace)
Rinnai error code 35 on a wall furnace means: Overheat temperature thermistor 2 short circuit. It is also called Rinnai diagnostic code 35.
Homeowner? What Rinnai code 35 means for you
Check, then call Your wall furnace is reporting: Overheat temperature thermistor 2 short circuit. This is often caused by something simple. Try the safe checks below; if the code returns, book a service call before it turns into a no-heat or no-hot-water emergency.
Safe things you can check yourself
- Check the thermostat: right mode (Heat or Cool), set a few degrees past room temperature, and fresh batteries if it uses them.
- Make sure the unit has power: its on/off switch (often looks like a light switch near the unit) is ON and the breaker in the electrical panel is not tripped.
- Make sure the furnace front door or panel is closed properly; many furnaces will not run with the door switch open.
- Look at the air filter. If it is grey and clogged, replace it; a blocked filter causes many shutdowns.
- Outside, make sure the intake and exhaust pipes or vent cap are not blocked by snow, ice, leaves or a nest.
- Check that the gas valve next to the furnace is open (handle in line with the pipe). Do not force it.
- Try one reset: turn the power off for 30 seconds, then back on. If the code comes back, stop resetting and call a technician.
Call (647) 657-2977Book a service call
Licensed technicians serving Vaughan, Toronto and the GTA.
What does Rinnai error code 35 mean?
The manual lists this as a service-call fault: the overheat temperature thermistor 2 circuit is shorted.
Applies to: Rinnai EnergySaver direct vent wall furnaces EX08DT, EX11DT, EX17DT, EX22DT
Common causes of Rinnai code 35
- Overheat thermistor 2 or its wiring shorted
Rinnai models that use code 35
EX08DTEX11DTEX17DTEX22DTEX22DT-W
Other Rinnai Wall Furnace codes
All Rinnai Wall Furnace error codes →
Rinnai code 35: homeowner questions
What does Rinnai code 35 mean?
Overheat temperature thermistor 2 short circuit. The manual lists this as a service-call fault: the overheat temperature thermistor 2 circuit is shorted.
Is it safe to keep using my wall furnace with code 35?
It depends on the cause. This is often caused by something simple. Try the safe checks below; if the code returns, book a service call before it turns into a no-heat or no-hot-water emergency.
Can I reset Rinnai code 35 myself?
You can try one reset (power off for 30 seconds, then on). If Rinnai code 35 comes back, the cause is still there and a licensed technician should check it.
Who can fix Rinnai code 35 near me?
Aurora Star Tech Inc. repairs Rinnai wall furnaces in Vaughan, Toronto and across the GTA. Call (647) 657-2977 or book a service call online.
Homeowner help: Furnace Not Turning On: What to Check
Source: Rinnai EX08DT/EX11DT and EX17DT/EX22DT Installation and Operation Manuals (200000083, 200000084), Table 9 'Diagnostic Codes', p.35–36. Written in our own words as a summary; always check the original manual.
General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.