Water Heater

Resetting Your Rheem Tankless Water Heater: A DIY Approach

Water heater

Rheem tankless water heaters are known for their efficiency and reliability, providing a continuous supply of hot water. However, like any sophisticated appliance, they may occasionally require troubleshooting. One of the simplest yet effective ways to address minor issues is by resetting your Rheem tankless water heater. This guide is designed to assist homeowners in safely and effectively performing a reset, ensuring the optimal functioning of their water heating system.

Understanding When to Reset Your Water Heater:

The need to reset your Rheem tankless water heater can arise for various reasons. It could be due to an error code displayed on the unit, a malfunction such as inconsistent water temperature, or the system simply not turning on. In many cases, a reset can clear the error and restore normal function.

Safety First:

Before attempting to reset your water heater, prioritize safety. Ensure that the power supply to the unit is turned off. This can be done by switching off the circuit breaker or the power switch on the unit. This step is crucial to prevent any electrical hazards.

Steps to Reset Your Rheem Tankless Water Heater:

  1. Power Off the Unit: Initially, turn off the water heater by switching off the circuit breaker or the power switch on the unit. Wait for a few moments to allow the system to completely power down.
  2. Locate the Reset Button: On most Rheem tankless water heaters, the reset button is located on the thermostat panel. This may require removing a cover or access panel to reach the thermostat.
  3. Press the Reset Button: Once you have located the reset button, typically marked and often red, press and hold it for a few seconds. You should hear a click sound, indicating that the reset is complete.
  4. Restore Power and Check: After pressing the reset button, restore power to the unit. Turn on a hot water tap and check if the water heater is functioning correctly. Look for consistent water temperature and flow.

Monitoring Post-Reset:

After resetting your Rheem tankless water heater, it’s important to monitor its performance. If the unit continues to show error codes or fails to produce hot water consistently, it may indicate a deeper issue that needs professional attention.

Regular Maintenance:

To prevent frequent resets, regular maintenance of your Rheem tankless water heater is recommended. This includes checking for scale build-up, ensuring proper venting, and occasionally flushing the system to remove any sediment.

When to Call a Professional:

If resetting the water heater does not resolve the issue, or if you are uncomfortable performing the reset yourself, it is advisable to contact a professional technician. Persistent issues may require a more thorough inspection and repair, which should be handled by a qualified expert.


Resetting your Rheem tankless water heater can be a straightforward solution to common problems. This DIY approach is a valuable skill for homeowners, allowing for quick troubleshooting. However, understanding the limitations of a reset is important. Regular maintenance and seeking professional assistance when necessary are crucial for ensuring the long-term efficiency and reliability of your Rheem tankless water heating system. This balance of DIY troubleshooting and professional oversight will keep your home supplied with efficient and reliable hot water.

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