HVACopediaRinnai · Furnace · Ignition
Ignition failure and flame loss retry
What happens, in order
- If the burner does not light, the furnace waits and retries ignition after 1 hour
- Fault code 11 (ignition failure) shows during that hour and clears when ignition succeeds
- If the retry fails the code stays and another try follows in 1 hour
- If flame goes out during the forced combustion period the same 1 hour wait and code 11 apply
- If flame goes out after forced combustion, while the temperature control is running the burner, the furnace tries to relight immediately with no code
- This ignition-failure code is not saved in the fault history
Timings and thresholds
| Item | Value |
|---|---|
| Retry delay after ignition failure | 1 h |
| Forced combustion period | about 15 to 18 s |
Codes you may see during this
11
Applies to: Rinnai EX08DT, EX11DT, EX17DT, EX22DT direct-vent room furnaces
Models
More Rinnai furnace sequences
- Normal start and heating · Startup
- Normal shutdown and cool-down · Standby/shutdown
Related
Rinnai error codes · Rinnai tips · Rinnai parts · All Rinnai sequences
Take it to the job
Sequences of operation, error codes and tips work offline in the HVACopedia app.
Source: Rinnai EX08DT and EX11DT Installation and Operation Manual (200000083) and EX17DT and EX22DT Installation and Operation Manual (200000084), operation and fault sections. Written in our own words; timings can differ by model and software version, so check the manual for your exact unit.
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.