Rinnai Error Code 57: Burner overheat bi-metal switch open (Tankless)
Rinnai error code 57 on a tankless water heater means: Burner overheat bi-metal switch open. It is also called Rinnai diagnostic code 57.
Homeowner? What Rinnai code 57 means for you
Stop and call Your tankless water heater is reporting: Burner overheat bi-metal switch open. 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 57 mean?
One of the two bi-metal switches at the back of the burner assembly has opened. The code shows whether or not the unit is running and clears only after the fault is fixed and power is cycled (hard reset).
Applies to: Non-SENSEI Series (KB Series condensing: see Technical Bulletin 107)
Common causes of Rinnai code 57
- Loose, broken or damaged bi-metal switch wiring
- Heater connected to the wrong gas type
- Low/high fire manifold pressures set incorrectly
A technician checks these and 2 other possible causes on site before replacing any part.
Rinnai models that use code 57
Show all 59 models
C199eC199iR50LSiR63LSe2R75LSeR75LSiR94LSeR94LSiR98LSeR98LSe-ASMER98LSiR98LSi-ASMERC80eRC80iRC98eRC98iRE140eRE140iRE160eRE160iRE180eRE180iRE199eRE199iREP160eREP160iREP199eREP199iRH180RL75eRL75e(A)RL75iRL75i(A)RL94eRL94iRLX94iRU80eRU80iRU90eRU98eRU98iRUC80iRUC90iRUC98iRUCS65iRUCS75iRUR98eRUR98iRUS65eRUS75eV53DeV53eV65eV65iV75eV75iV94eV94iV94Xi
Other Rinnai Tankless codes
All Rinnai Tankless Water Heater error codes →
Rinnai code 57: homeowner questions
What does Rinnai code 57 mean?
Burner overheat bi-metal switch open. One of the two bi-metal switches at the back of the burner assembly has opened. The code shows whether or not the unit is running and clears only after the fault is fixed and power is cycled (hard reset).
Is it safe to keep using my tankless water heater with code 57?
No. Code 57 is a safety shutdown, so keep the tankless water heater off until a licensed technician has checked it.
Can I reset Rinnai code 57 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 57 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
Source: Rinnai Troubleshooting TWH Diagnostic Codes (100000652), p.50. 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.