Rinnai Boiler Error Codes

A plain-English reference to 20 common Rinnai fault codes — what each means, what causes it, and when to call a licensed BC gas technician.

Rinnai boilers and combi units show a numeric fault code on the control or remote. Built on Rinnai's tankless heritage, they are reliable but sensitive to venting and gas-supply conditions. This reference covers the common Rinnai fault codes, their likely causes, and why ignition, flame, gas-valve and venting faults are work for a licensed BC gas technician.

Smell gas? Leave the building immediately and call 911 or FortisBC at 1-800-663-9911 from outside. Never bypass a safety lockout or attempt gas work yourself — in BC it must be done by a licensed gas fitter.

Air-pressure / venting fault

Rinnai 10Air-Supply or Exhaust Blockage Rinnai 90Combustion / Venting Abnormality Rinnai 99Venting Blockage / Improper Combustion

Ignition fault

Rinnai 11No Ignition / No Flame Sensed

Flame failure

Rinnai 12Flame Failure Rinnai 31Burner / Flame Sensor Fault Rinnai 72Flame-Sensing Device Fault

Over-temperature / high-limit

Rinnai 14Thermal Fuse / Overheat Rinnai 16Over-Temperature Warning

Condensate fault

Rinnai 25Condensate Drain Fault Rinnai 29Condensate Drain Blocked

Temperature-sensor fault

Rinnai 32Outlet Water-Temperature Sensor Fault Rinnai 33Heat-Exchanger Sensor Fault Rinnai 34Combustion-Air Temperature Sensor Fault

Gas-supply / gas-valve fault

Rinnai 51Gas Solenoid Valve Fault Rinnai 52Gas Solenoid Signal Abnormal Rinnai 71Gas-Control Circuit Fault

Combustion-fan fault

Rinnai 61Combustion-Fan Failure

Water-flow / circulation fault

Rinnai 65Water-Flow Control Valve Fault Rinnai LCScale Build-Up / Maintenance Needed

Rinnai error codes — FAQ

Why is my Rinnai boiler showing an error code?

Rinnai boilers display a fault code when a safety circuit detects a problem — for example with ignition, flame, water flow, temperature or venting. The code points to the affected system. The boiler shuts down to protect itself; a licensed technician then diagnoses the true root cause before repair.

Can I just reset my Rinnai boiler?

A single reset after a one-off event is usually fine, but repeated resets without fixing the cause can be unsafe — especially for ignition, gas and venting faults — and can cause further damage. If the code returns, switch the boiler off and call GasBoilers.ca at 604-359-1081.

Do you repair all Rinnai boiler models in Greater Vancouver?

Yes. Our Red Seal–certified, gas-licensed technicians service Rinnai i-Series, M-Series and Q-Series across Vancouver, Burnaby, Surrey, Richmond, the Tri-Cities and the rest of Greater Vancouver. Same-day appointments are often available.

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Error codes by brand

Navien error codesNCB-E, NCB-H, NHB, NFB and NPE-A2 series IBC error codesSL, V, DC and HC series Viessmann error codesVitodens 100-W, 200-W and 222-F series Bosch error codesGreenstar and Singular series Noritz error codesNCC combi and condensing series Rheem error codesPrestige and Classic Plus series Weil-McLain error codesECO, ECO Tec, Ultra and Evergreen series Lochinvar error codesKnight, WHN and SMART System series Baxi error codescombi and system condensing series Bradford White error codesBrute Elite condensing series Burnham error codesAlta, Aspen and Independence series Lennox error codesGWB8-IH gas-fired hot water boilers

Get your Rinnai boiler back up and running

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