HVACopedia

Rinnai · Combi boiler

FFF Maintenance performed marker

Low severity I-Series Plus 150K and smallerI-Series Plus 175K and higher

What the control is telling you

Not a fault: FFF is a marker in the diagnostic code history showing that a service provider performed maintenance or service.

Applies to: I-Series Plus boilers — 150K BTU and smaller and 175K BTU and higher (Combi and Solo)

Likely causes

  • Entered manually by a technician after servicing the boiler
  • Indicates a service event in the code history

Test and repair steps

  1. After completing service, press UP, DOWN and DHW at the same time to log the FFF marker.
  2. Confirm FFF shows on the display.

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

  • 700 PC Board fault
  • 710 Gas solenoid circuit – valve position mismatch
  • 720 Flame rod fault
  • 763 0-10V external control input over-voltage
  • 890 Freeze condition detected
  • 999 PC Board / software mismatch
  • LC Lime condition – flush plate heat exchanger
  • SS Service Soon reminder

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Source: Rinnai Troubleshooting I-Series Plus Boiler Diagnostic Codes (800000375), p.45. Summarized in our own words; check the original manual for your model.

Homeowner looking at this code? See what it means for you and when to call a technician.

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.