Rinnai Error Code SW1-SW3: PC board buttons (SW1, SW2, SW3) (Boiler)

Updated October 15, 2026 · by Aurora Star Tech Inc.

Rinnai error code SW1-SW3 on a boiler means: PC board buttons (SW1, SW2, SW3). It is also called Rinnai diagnostic code SW1-SW3.

Low severityBoilerAlso Combi BoilerI-Series Plus 150K and smaller · I-Series Plus 175K and higher

Homeowner? What Rinnai code SW1-SW3 means for you

Usually minor Your boiler is reporting: PC board buttons (SW1, SW2, SW3). This code is usually informational or minor. The safe checks below often clear it; call us if it keeps showing up.

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.
Look at the pressure gauge on the boiler. If it reads much lower than usual or near zero, or water is leaking, call a technician.
Outside, make sure the intake and exhaust pipes or vent cap are not blocked by snow, ice, leaves or a nest.
Check that the boiler gas valve is open (handle in line with the pipe).
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) 657-2977 Book a service call

Licensed technicians serving Vaughan, Toronto and the GTA.

What does Rinnai error code SW1-SW3 mean?

The three push buttons on the PC board have fixed functions. SW1 opens parameter settings, SW2 starts deaeration mode (see Commissioning in the installation manual), SW3 handles data transfer to a new PC board, forced test combustion and flushing mode. Some are used in pairs for resets (SW2+SW3 for code 170, SW1+SW2 for code 520).

Applies to: Rinnai I-Series Plus boilers and combis (150K and smaller, 175K and higher)

Safety: Gas, electrical and refrigerant work must be done by a licensed technician. Turn off power and gas before servicing, never bypass a safety control, and always follow the manufacturer's manual for your exact model.

Rinnai models that use code SW1-SW3

IP060S IP090S IP120S IP150S IP175S IP199S

Other Rinnai Boiler codes

Code	Meaning
Status 7	Pump overrun, central heating
Status 8	Pump overrun, hot water
Status 9	Burner off, supply temperature too high
Status A	Automatic de-aeration program
StBY	Standby / exit to read-out
STOP	Fill target reached
Technical read-out	Technical read-out

All Rinnai Boiler error codes →

Rinnai code SW1-SW3: homeowner questions

What does Rinnai code SW1-SW3 mean?

PC board buttons (SW1, SW2, SW3). The three push buttons on the PC board have fixed functions. SW1 opens parameter settings, SW2 starts deaeration mode (see Commissioning in the installation manual), SW3 handles data transfer to a new PC board, forced test combustion and…

Is it safe to keep using my boiler with code SW1-SW3?

Usually yes. Code SW1-SW3 is normally minor, but if it keeps coming back have it checked.

Can I reset Rinnai code SW1-SW3 myself?

You can try one reset (power off for 30 seconds, then on). If Rinnai code SW1-SW3 comes back, the cause is still there and a licensed technician should check it.

Who can fix Rinnai code SW1-SW3 near me?

Aurora Star Tech Inc. repairs Rinnai boilers in Vaughan, Toronto and across the GTA. Call (647) 657-2977 or book a service call online.

Homeowner help: Boiler Not Heating: What to Check

Troubleshooting guides

No heat or some zones cold All brands · Boiler
Automatic de-aeration program (A xx, 17 min) Rinnai · Boiler
Central heating works, no domestic hot water Rinnai · Boiler
Change a parameter in the PARA chapter Rinnai · Boiler
DHW temperature drops Rinnai · Boiler
Force the burner on for combustion checks (SERV function 1) Rinnai · Boiler
Heating system warms without a call Rinnai · Boiler
Hot water works, no central heating Rinnai · Boiler
Ignition safety test (forced E02 lockout) Rinnai · Boiler
Insufficient hot water quantity Rinnai · Boiler
Open the installer level (code C123) Rinnai · Boiler
Open the parameter settings menu on the PC board Rinnai · Boiler
Radiators not hot enough or slow to heat Rinnai · Boiler
Read the technical read-out and error history Rinnai · Boiler
Reset the SERVICE reminder (8000 h counter) Rinnai · Boiler
Restore factory parameters (Copy) Rinnai · Boiler
Venturi reset on the PC board (code 170) Rinnai · Boiler
View the last nine error codes (DHW + Up) Rinnai · Boiler

Source: Rinnai Troubleshooting I-Series Plus Diagnostic Codes (800000375), PC Board Buttons table p.13. 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.