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Rinnai · Boiler

180 Gas valve air/fuel adjustment limit reached

High severity I-Series Plus 150K and smaller

What the control is telling you

The Smart-Sense gas valve has hit its gas-rich or gas-lean adjustment limit, which is restricted by gas type. In normal operation the limits shouldn't be reached.

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

Likely causes

  • Incorrect gas supplied
  • Parameter A0 gas type set wrong
  • Incorrect gas valve parameters entered
  • Flame rod wire disconnected or damaged

Test and repair steps

  1. Confirm the correct gas (natural or propane) is being supplied.
  2. Check Parameter A0 A = Natural Gas, B = Propane.
  3. Check or re-enter the gas valve parameters using 'Enter Gas Valve Values from Integrated Controller' in the Gas Valve Assembly Replacement Instructions (800000253).
  4. Confirm the flame rod wire is connected and undamaged.

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Source: Rinnai Troubleshooting I-Series Plus Boiler Diagnostic Codes (800000375), p.13. 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.