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Rinnai · Wall furnace

11 No ignition

High severity EX DT

What the control is telling you

The burner did not light. Code 11 shows as a dim flashing number. The furnace retries ignition after 1 hour; the code clears after a successful ignition and is not kept in the fault history.

Applies to: Rinnai EnergySaver direct vent wall furnaces EX08DT, EX11DT, EX17DT, EX22DT

Likely causes

  • Gas supply turned off
  • Vent termination blocked
  • Repeated ignition failure needing service

Test and repair steps

  1. Make sure the gas supply to the furnace is ON.
  2. Check that the vent termination outside is not blocked (snow, ice, debris, nests).
  3. The furnace automatically retries ignition after 1 hour (see section 5.7 'Restart Function'). If the flame goes out during forced combustion it also waits 1 hour before retrying.
  4. If the code stays or comes back on the next operation, a trained and qualified technician must service the unit.

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Source: Rinnai EX08DT/EX11DT and EX17DT/EX22DT Installation and Operation Manuals (200000083, 200000084), Table 9 'Diagnostic Codes', p.35–36. 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.