Richmond Error Code E2: Dry Fire
Warning: The 'E2' error indicates a 'Dry Fire' condition, meaning the burner is attempting to ignite without water flow. This can quickly lead to overheating and potential damage or fire. Shut down the unit immediately.
How to Fix Richmond Code E2
- Step 1: Immediately turn off the gas supply to the water heater. There should be a shut-off valve on the gas line leading to the unit.
- Step 2: Turn off the electrical power to the unit at the breaker box.
- Step 3: Check that the main water supply to the house is turned on. Then, verify that the shut-off valves on the cold water inlet line to the tankless unit are fully open.
- Step 4: If you suspect air in the lines, try opening a hot water faucet somewhere in the house to bleed any trapped air. Let it run for several minutes.
- Step 5: Do not attempt to restart the unit. Call a qualified HVAC technician or plumber to diagnose and repair the problem.
How to Reset Richmond Code E2
- 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.
What does E2 mean?
The Richmond tankless water heater displays an 'E2' error code when it detects a 'Dry Fire' situation. This means the unit is trying to fire up the burner, but it's not sensing any water flowing through the heat exchanger. Without water to absorb the heat, the unit can rapidly overheat, potentially damaging components like the heat exchanger itself, the burner, or even creating a fire hazard. This is a critical safety issue, so it's important to address it immediately. The unit will likely lock out and stop operating until the issue is resolved. A dry fire can occur for several reasons, all related to lack of water flow or a sensor malfunction.
Affected Models
Replacement Parts
| Part | OEM Number | Est. Cost |
|---|---|---|
| Flow Sensor | — | — |
| Inlet Water Filter | — | — |
| Heat Exchanger | — | — |