Richmond Error Code E3: Overheat Protection
Warning: Your Richmond water heater has shut down due to overheating. This requires investigation and may need professional repair.
How to Fix Richmond Code E3
- Step 1: Check for any obvious blockages of the air intake or exhaust vents outside the house. Clear any obstructions like snow, leaves, or debris.
- Step 2: Reset the water heater by turning off the power to the unit at the breaker for a few minutes, then turning it back on. See if the error code clears.
- Step 3: If the error code reappears or you are not comfortable performing these steps, contact a qualified HVAC technician to diagnose and repair the issue.
How to Reset Richmond Code E3
- 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 E3 mean?
The E3 error code on your Richmond tankless water heater indicates that the unit's high limit thermostat has tripped, meaning the water temperature inside the heat exchanger exceeded a safe threshold. This safety feature is designed to prevent scalding and damage to the unit. When this happens, the heater will shut down and display the E3 error. Several things can cause this, from simple scaling to more serious component failures. It's important to figure out the root cause to prevent it from happening again and potentially damaging the unit.
Affected Models
Replacement Parts
| Part | OEM Number | Est. Cost |
|---|---|---|
| High Limit Thermostat | — | — |
| Combustion Fan | — | — |
| Flow Sensor | — | — |