If you see the error code E04 on your Navien water heater, it means that the temperature sensor or thermistor is not working correctly. This can happen for a number of reasons, including a loose connection, a bad sensor, or a problem with the control board.
If you see this error code, you'll need to troubleshoot the problem to figure out what is causing it. First, check the connections to the sensor and make sure they are tight. Next, test the sensor with a multimeter to see if it is working correctly. If the sensor is bad, you'll need to replace it. Finally, check the control board for any signs of damage or corrosion.
Navien water heater troubleshooting can be a challenge, but with a little patience and perseverance, you can figure out what is causing the problem and fix it.
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1. Call a Navien-certified technician
The first step would be to contact the Navien-certified technician to discuss the issue you are experiencing. The technician would then be able to provide you with a diagnosis and possible repair options.
2. Check the power supply
1.Turn off the power to the water heater. 2.Check the power supply cord to make sure it is plugged into an outlet and not connected to another appliance. 3.Check the power supply to the water heater for proper voltage. 4.Check the fuses in the electrical box for the water heater. 5.If the power supply is okay, check the water heater for proper water flow. 6.If the water flow is okay, check the water heater for proper gas flow. 7.If the gas flow is okay, check the water heater for proper heat. 8.If the heat is okay, check the water heater for proper insulation. 9.If the insulation is okay, check the water heater for proper controls. 10.If the controls are okay, check the water heater for proper valves.
3. Check the water supply
- Check to see if there is water coming out of the faucet. If there is, then the water supply is fine.
- If there is no water coming out of the faucet, then check to see if the water is running. If it is not running, then the water supply might be broken.
- If the water is not running, then check to see if there is water coming out of the water heater. If there is, then the water might be turned off.
- If the water is not coming out of the water heater, then the water supply might be broken. In that case, the water might have to be turned off and the water heater might have to be replaced.
If the answers above didn't work then you should also try:
- Check the gas supply
- Check the exhaust
- Check the controls
- Check the safety devices