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Rinnai · Combi boiler

SW1-SW3 PC board buttons (SW1, SW2, SW3)

Menu / mode display I-Series Plus 150K and smallerI-Series Plus 175K and higher

What the display is showing

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)

What to do

  1. SW1 hold about 5 seconds for parameter settings.
  2. SW2 deaeration mode.
  3. SW3 data transfer / test combustion / flushing mode.

Models that show this code

8 models in I-Series Plus 150K and smaller, I-Series Plus 175K and higher

IP060160CIP090099CIP090160CIP090199CIP120199CIP150199CIP175199CIP199199C

Other codes on the same units

  • 720 Flame rod fault
  • 763 0-10V external control input over-voltage
  • 890 Freeze condition detected
  • 999 PC Board / software mismatch
  • ECL Reset complete (gas solenoid circuit)
  • FFF Maintenance performed marker
  • LC Lime condition – flush plate heat exchanger
  • P Venturi reset: first screen

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Source: Rinnai Troubleshooting I-Series Plus Diagnostic Codes (800000375), PC Board Buttons table p.13. Summarized in our own words; check the original manual for your model.

For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.