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How To Reset Lochinvar Water Heater

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Lochinvar water heaters are known for their high efficiency and innovation, making them a popular choice for homeowners and businesses alike. But like any appliance, they can sometimes experience issues that require troubleshooting. One common issue is the need to reset the water heater. This article will explain in detail how to reset a Lochinvar water heater, common reasons why you might need to reset it, and what to do if the water heater fails to reset.


To reset a Lochinvar water heater, first turn off the power supply. Then, locate the reset button on the thermostat and press it. After pressing the reset button, turn the power supply back on. Make sure to check if the water heater is functioning correctly after resetting. If the issue persists, you may need to consult a professional.

Locating the Reset Button

Most Lochinvar water heaters have a reset button on the thermostat. For electric storage water heaters, you’ll find a large, red reset button on the thermostat. If you have a tankless version, you can find the reset button by opening up your appliance and locating the thermostat, which may be a black box or cylindrical component near the heating element.

How to Reset the Water Heater

To reset your Lochinvar water heater, follow these steps:

  1. Turn off the power supply: For safety, switch off the circuit breaker or unplug the water heater from the electrical outlet.
  2. Locate the reset button: As mentioned above, the reset button is typically located on the thermostat.
  3. Press the reset button: Press or flip the reset button or switch on the thermostat to reset your heater back to its standard heating settings.
  4. Turn the power supply back on: Switch on the circuit breaker or plug the water heater back into the electrical outlet.
  5. Check for proper functioning: After resetting the water heater, ensure that it is functioning correctly. If the issue persists, you may need to consult a qualified service agent for further troubleshooting and repairs.

Common Reasons for Resetting a Lochinvar Water Heater

There are several reasons why a Lochinvar water heater might need to be reset. These include:

  1. Heating malfunction: If the water heater is not heating water correctly and producing cold water, resetting the thermostat can potentially solve the issue.
  2. Tripped reset button: The water heater’s reset button may trip due to a faulty thermostat, loose wiring, corroded parts, a grounding problem, or a malfunctioning high limit switch.
  3. Overheating: If the water temperature exceeds the safety limit, the reset button will trip to cut power to the unit and prevent damage or injury.
  4. Electrical issues: Loose wiring or a bad breaker can cause the reset button to trip, cutting power to the water heater.

What to Do if the Water Heater Fails to Reset

If your Lochinvar water heater fails to reset, it might have a faulty thermostat or a problem with the high limit switch. In this case, it is best to consult a professional plumber or technician to diagnose and fix the issue. Remember, repeatedly tripping the reset button can be a sign of a larger problem that needs professional attention.


Resetting a Lochinvar water heater is a relatively simple process that can solve several common issues. However, if the reset button continues to trip or the water heater fails to reset, it is advisable to seek professional help. Regular maintenance of your water heater can also help prevent the need for resetting and ensure the longevity and efficiency of your appliance.

Frequently Asked Questions

How often should I reset my Lochinvar water heater?

It’s not recommended to frequently reset your water heater. If you find yourself having to reset it often, it may indicate a more serious problem that needs professional attention.

Can resetting my Lochinvar water heater damage it?

No, resetting your water heater will not damage it. In fact, it’s a standard troubleshooting step for various issues. However, if the reset button continues to trip after resetting, it’s advisable to seek professional help.

How do I know if my Lochinvar water heater’s thermostat is faulty?

Signs of a faulty thermostat can include fluctuating temperatures, the water being too hot or too cold, or the heater not turning on at all. If you suspect a faulty thermostat, it’s best to contact a professional to diagnose and fix the issue.

What should I do if my Lochinvar water heater is overheating?

If your water heater is overheating, it’s crucial to turn off the power supply to the unit and contact a professional immediately. Overheating can lead to dangerous situations, including the risk of the water heater exploding.

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