Rinnai Tankless water heater error codes

Plain-English meanings and step-by-step fixes, sourced from the manufacturer manual.

• Code 10· Air Supply, Exhaust Blockage or Condensate Trap is Full
• Code 11· No Ignition
• Code 12· Flame Failure
• Code 16· High Outgoing Water Temperature
• Code 61· Combustion Fan Motor
• Code SS· Service Soon (time-based service reminder)