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How to check hot water heater thermostat? Electric water heater testing

By shafiq usama

How to check hot water heater thermostat

As an electrical engineer, I love explaining how things like circuits and electronics work. I write on my blog to share simple explanations, reviews, and useful tips about the latest technology.

If you're experiencing problems with your hot water heater, the thermostat may be to blame. In this guide, I'll show you how to check hot water heater thermostat and fix related issues. Follow these simple steps and you'll have your hot water heater up and running in no time! However, before you test a thermostat, you need to understand what it is.

What is a thermostat?

A thermostat is a device that controls the temperature of your hot water heater. It's important to keep your thermostat in good working condition because it can help you save money on your energy bill. The thermostat is located in the control panel of your hot water heater. 

How does a thermostat work?

A thermostat works by regulating the amount of electricity that flows to your hot water heater. When the thermostat is turned up, more electricity flows to the heater and the water gets hotter. When the thermostat is turned down, less electricity flows to the heater and the water gets cooler.

You can adjust the temperature of your hot water heater by turning the thermostat knob. Most thermostats have a range of 50-70 degrees Fahrenheit.

Why is my hot water heater not working?

There are a few reasons why your hot water heater might not be working. The most common reason is that the thermostat is set too low. If the thermostat is set below 50 degrees Fahrenheit, the heater will not turn on. Another common reason is that the power of the hot water heater is turned off. Check the circuit breaker to make sure that the power is turned on. If you don't know how to check a circuit breaker then CLICK HERE!

If your hot water heater is still not working, the heating element might be damaged. The heating element is a metal rod that heats up the water in the tank. If the element is damaged, it will need to be replaced.

What are some signs that my thermostat is not working?

Some signs that your thermostat is not working properly include:

  • The water in your hot water heater is not staying hot.
  • Your energy bill is higher than usual.
  • There is water leakage around the thermostat.
  • The thermostat is not clicking when you touch the wires together.

If you notice any of these signs, it's a good idea to test your thermostat.

Tools required to test water heater thermostat

There are a few tools that you will need to test your hot water heater thermostat:

Now that you know what you need, let's get started!


How to check hot water heater thermostat?

There are multiple ways that you can check your hot water heater thermostat. The most common way is to use a multimeter. A multimeter is an electronic device that measures electricity.

Testing a thermostat with a multimeter

  • Turn off the power to your hot water heater.
  • Remove the access panel to the control panel.
  • Locate the thermostat and unscrew it from the control panel.
  • Touch the black probe of the multimeter to the black wire on the thermostat.
  • Touch the red probe of the multimeter to the red wire on the thermostat.
  • Set the multimeter to the Ohms setting.
  • The reading on the multimeter should be between 50 and 100 Ohms.
  • If the reading is not within this range, the thermostat is damaged and needs to be replaced.

Now that you know how to use a multimeter to check your hot water heater thermostat, let's move on to some of the safety precautions.

Safety Guide

While testing your thermostat, it's important to follow these safety guidelines otherwise you could be injured:

  • Always turn off the power to your hot water heater before removing the access panel or thermostat.
  • Never touch the live wires with your bare hands. Always use a screwdriver or other tool to touch the wires.
  • If there is any water leakage, immediately turn off the power to your hot water heater.
  • Using incorrect temperature ranges can result in scalding. Therefore, when you are not using the hot water heater, set the thermostat to 50 degrees Fahrenheit or lower.
  • If you're not comfortable working with electricity, it's best to hire a professional.

Now that you know how to check hot water heater thermostat, follow these steps to ensure that your hot water heater is working properly. If you have any questions, be sure to consult a professional.

Frequently Asked Questions

How often should you test your thermostat?

It's a good idea to test your thermostat once a year. This will help you catch any problems early on and prevent them from becoming bigger issues.

What is water heater scalding and how to avoid it?

Water heater scalding is when the water temperature gets too hot and causes burns. It's important to avoid this by setting the thermostat to 50 degrees Fahrenheit or lower when you're not using the hot water heater. Additionally, make sure that you always use caution when handling hot water.

Why is it important to test your thermostat regularly?

It's important to test your thermostat regularly because it ensures that your hot water heater is working properly. A damaged or malfunctioning thermostat can cause your hot water heater to overheat or not heat the water properly. This can lead to scalding, water damage, and other problems. By regularly testing your thermostat, you can avoid these problems.