Rinnai Error Code 30: Flammable vapor sensor activated or faulty (Tankless)
Rinnai error code 30 on a tankless water heater means: Flammable vapor sensor activated or faulty. It is also called Rinnai diagnostic code 30.
Homeowner? What Rinnai code 30 means for you
Stop and call Your tankless water heater is reporting: Flammable vapor sensor activated or faulty. This code is a safety shutdown. Turn the tankless water heater off and call a licensed technician. Do not keep resetting it. If you smell gas, leave the house and call your gas utility or 911 from outside.
Safe things you can check yourself
- Check that gas reaches the house: other gas appliances work, or the propane tank is not empty.
- Make sure the heater is plugged in and its breaker is on. In winter, keep the power on: it protects the unit from freezing.
Call (647) 657-2977Book a service call
Licensed technicians serving Vaughan, Toronto and the GTA.
What does Rinnai error code 30 mean?
The flammable vapor sensor has tripped or failed; flammable vapors may be present near the water heater.
Applies to: RH180 (Hybrid Tank-Tankless Non-SENSEI Series)
Common causes of Rinnai code 30
- Flammable vapors present in the installation space
- Loose, damaged or broken sensor wiring or connectors
- Flammable vapor sensor mis-mounted or damaged
A technician checks these and 2 other possible causes on site before replacing any part.
Rinnai models that use code 30
Other Rinnai Tankless codes
All Rinnai Tankless Water Heater error codes →
Rinnai code 30: homeowner questions
What does Rinnai code 30 mean?
Flammable vapor sensor activated or faulty. The flammable vapor sensor has tripped or failed; flammable vapors may be present near the water heater.
Is it safe to keep using my tankless water heater with code 30?
No. Code 30 is a safety shutdown, so keep the tankless water heater off until a licensed technician has checked it.
Can I reset Rinnai code 30 myself?
Do not keep resetting it. Repeated resets can hide a safety problem; a licensed technician needs to find the cause.
Who can fix Rinnai code 30 near me?
Aurora Star Tech Inc. repairs Rinnai tankless water heaters in Vaughan, Toronto and across the GTA. Call (647) 657-2977 or book a service call online.
Homeowner help: Tankless Water Heater No Hot Water: What to Check
Troubleshooting guides
- No hot water All brands · Tankless Water Heater
- Water temperature fluctuates All brands · Tankless Water Heater
- Checking PC board fuses and thermistors Rinnai · Tankless Water Heater
- Enter installer parameter mode (A button on the PC board) Rinnai · Tankless Water Heater
- First power-up setup: gas type and indoor/outdoor (RX/CX) Rinnai · Tankless Water Heater
- Lock or unlock the controller (key symbol) Rinnai · Tankless Water Heater
- Lock or unlock the KCM controller (LOC) Rinnai · Tankless Water Heater
- Performance data readout (items 01 to 24) Rinnai · Tankless Water Heater
- Reset after cleaning the venturi or replacing the gas valve (codes 17 / 52) Rinnai · Tankless Water Heater
- Reset the Service Soon (SS) reminder Rinnai · Tankless Water Heater
- Show live flow and outlet temperature on the KCM controller Rinnai · Tankless Water Heater
- Show the last 9 stored codes (diagnostic history) Rinnai · Tankless Water Heater
- Start descaling (vinegar flush) mode on the PC board Rinnai · Tankless Water Heater
- Switch the controller between Celsius and Fahrenheit Rinnai · Tankless Water Heater
- Turn controller key beeps on or off Rinnai · Tankless Water Heater
- Weak or missing flame signal (flame rod checks) Rinnai · Tankless Water Heater
Source: Rinnai Troubleshooting TWH Diagnostic Codes (100000652), p.35. 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.