Rinnai 11 Error Code: No ignition
Updated October 2026 · Sourced from Rinnai documentation
The heater did not light. The manual lists confirming the gas is on, correct gas type and pressure, bleeding air from gas lines, and an unblocked condensate line.
Is it safe to keep running? Check the steps below first. If the gas is on and the code returns, call a licensed gas technician. Gas pressure, igniter and gas valve checks are not for homeowners.
11 at a glance
| Code / how it shows | Meaning | Applies to |
|---|---|---|
| 11 Code shown on the temperature controller display | No ignition | SENSEI N Series residential condensing: RU199i, RU180i, RU160i, RU130i (indoor) and RU199e, RU180e, RU160e, RU130e (outdoor) |
Check this first
Only steps a homeowner can do safely. Do not open electrical panels or the burner area.
- Check that the gas is turned on at the water heater, meter, or cylinder (propane: make sure there is gas in the tank).
- Check that the condensate line is not blocked or frozen where you can see it.
- Turn off power, wait, and turn it back on to retry.
🛑 Stop and call a licensed pro if
- If the gas is on and the code returns, call a licensed gas technician. Gas pressure, igniter and gas valve checks are not for homeowners.
- You smell gas. Leave the house, do not touch switches, and call your gas utility from outside.
- Codes for flame failure, overheating, venting or the control board that return after one reset.
- Water leaking from the heater, the relief valve discharging, or scorching around the burner area.
- A carbon monoxide alarm sounds. Get everyone outside and call 911 or the fire department.
Safe first steps for any Rinnai code
- Write down the exact code shown on the controller or the number of status light flashes.
- Turn the water heater power off and back on (or press the reset button the manual describes) once. If the code comes back, stop resetting.
- Make sure the gas supply valve to the heater is open and other gas appliances in the home are working.
- Make sure the cold water supply valve is fully open and hot water taps are not partly closed.
- Look at the outside vent terminal for snow, ice, leaves or anything blocking it (look only).
Source: Rinnai SENSEI N Series Residential Installation and Operation Manual (100000467), 5.6 Diagnostic Codes, p.73. Codes are series-specific, so your unit's own manual is the final word. Reviewed October 2026.
Ryan Giles · Red Seal Certified Plumber · Ask a plumber · Ask an HVAC technician