Richmond Error Code 12: Flame Failure
How to Fix Richmond Code 12
- Step 1: Immediately shut off the gas supply to the water heater. There should be a gas shut-off valve on the gas supply pipe leading to the unit.
- Step 2: Open windows and doors to ventilate the area in case of gas accumulation.
- Step 3: Do not attempt to relight the water heater yourself. Contact a qualified HVAC technician or gas appliance specialist to diagnose and repair the problem.
How to Reset Richmond Code 12
- Turn off the unit using the power button on the front panel.
- Turn off the gas supply valve.
- Turn off the circuit breaker supplying power to the unit. Wait 30 seconds.
- Restore power at the breaker, then open the gas valve.
- Turn the unit back on. If the error returns, the underlying issue needs repair.
Resetting clears the code from the display but does not fix the underlying fault. If the code returns after reset, proceed to the diagnostic steps above.
What Does Richmond Error Code 12 Mean?
Error code 12, 'Flame Failure,' on your Richmond water heater means the unit tried to light the burner, but the flame wasn't properly detected or went out during operation. This is a critical safety issue because unburned gas can accumulate, creating a risk of explosion or carbon monoxide poisoning. The water heater's control system is designed to shut down the gas supply when a flame isn't sensed to prevent these hazards. Several components work together to ensure proper flame ignition and detection. The igniter starts the flame, and the flame sensor (usually a flame rod) confirms the flame's presence to the control board. If any of these components fail or if there's a problem with the gas supply or venting, the water heater will shut down and display the 'Flame Failure' error.
Common Causes
- Dirty or faulty flame sensor: The flame sensor rod may be coated with deposits, preventing it from properly detecting the flame.
- Insufficient gas supply: Low gas pressure or a closed gas valve can prevent the burner from lighting.
- Blocked vent: A blocked vent can cause incomplete combustion and flame instability.
- Faulty igniter: The igniter may fail to create a spark, preventing ignition.
- Defective gas valve: The gas valve may not be opening properly to allow gas flow to the burner.
Diagnostic Steps
| If... | Check | Expected |
|---|---|---|
| Unit displays error code 12 after attempting ignition | Measure the flame sensor microamp signal while the burner is firing | Typically 2-10 microamps DC. A reading of 0 or very low indicates a problem with the flame sensor or its circuit. |
| Flame sensor signal is low or absent | Inspect the flame sensor rod for dirt, corrosion, or damage | Rod should be clean and free of damage. Clean with fine steel wool if necessary. |
| Flame sensor appears clean | Measure the resistance of the flame sensor wire from the sensor to the control board | Should be close to 0 ohms, indicating a good connection. |
| Gas pressure is suspected to be low | Measure the incoming gas pressure at the gas valve with a manometer | Should be within the manufacturer's specified range (typically 4-7 inches of water column for natural gas). |
Applicable Richmond Models
Replacement Parts
| Part | OEM Number | Est. Cost | Where to Buy |
|---|---|---|---|
| Flame Sensor | — | — | — |
| Gas Valve | — | — | — |
| Igniter | — | — | — |
Related Codes on Same Models
Other codes that affect the same Richmond model families as 12.
| Code | Description | Severity |
|---|---|---|
| 11 | No Ignition | Critical |
| 14 | Overheat | Warning |
| 16 | Outlet Temp Sensor | Warning |
| E1 | Sensor Fault | Warning |
| E2 | Dry Fire | Critical |
| E3 | Overheat Protection | Warning |
| E4 | High Temp Cutoff | Critical |
| E5 | Element Fault | Warning |