how to test electric water heater thermostat with digital multimeter

If the multimeter shows 0 or no results, then it means there is no continuity and electricity cannot get from one end to the other end. Step 3. Test the heating element. The upper and lower both consist of a thermostat right above each element. ... Calibrate the meter by pinching the probes together and adjusting the needle to 0. Just follow these steps and you will be able to test the water heater element with the help of a digital multimeter, despite having no electrical work experience. To test, you will need a multimeter and screwdriver. On the terminals of the thermostat, make sure you’re receiving power. This video demonstrates how to test a thermostat on a water heater. You may have one or two access panels. How To Test Water Heater Thermostat? So how to test water heater thermostat? The essence of the Multimeter can supplant the component that isn’t acceptable, and this makes the Multimeter to move. If the fan isn’t working, repeat with the Red and Green. You don’t need professional skills for this. In most cases, the circuit box has a label, so you will not have a hard time finding it. If the thermostat fails either test, replace with duplicate part from manufacturer. Now remove the water heater element form the water heater thermostat and then set your multi meter knob on connectivity testing. Now have a look at the water heater’s base part. Remove the access panel(s) and insulation so you can access the thermostat(s). Or set your multimeter on ohm testing or diodes testing. The top element heats the water first and then the bottom element kicks in. So without further ado. Follow the steps to ensure the functionality of your thermostat. This particular hot water heater is an 80 gallon dual element. If it reads O.L., you’ve got a functional thermostat. The inscribed wattage and ohms must be visible here. Electric water heater element test procedure: this article describes how to test electric hot water heater heating elements, what readings to expect if using an ohmmeter. In this video, you will learn how to easily diagnose a problem with your electric hot water heater. All electric water heaters have a minimum of one primary heating element used for heating up the water, ... as well as a digital multimeter to check for faults. You will notice a relief valve near the top of the water heater, you can flip the handle up to open it. The water heater element is what heats the water up in electric water heaters. Remove the upper access panel screws first on the electric water heater with a screwdriver. Set the dial on the digital multimeter to read resistance, often represented by the word "Ohms," or the Greek letter Omega. Troubleshoot Electric Water Heater and Replace Thermostat. Check the thermostat with a multimeter . Before you proceed further with the process of testing the heater thermostat, take a screwdriver and the multimeter. On this water heater, the thermostat switch is between terminals 1 and 2. To do this test, you will need a multimeter to check if there are any live points on the heater and to check the thermostat as well. Once you gather your tools, follow the steps below to test your water heater thermostat. A Digital Multimeter which measures voltage, current and Ohms (resistance) is an excellent instrument for checking thermostats. Place one of the multimeter probes on a screw attached to the face of the element. In case of a 3500 watts water heater, the reading should be 16 Ω. When checking the thermostat in a single element water heater or the upper thermostat in a dual element water heater the process is the same. Unscrew wire connector, and separate wires. If your water heater is 3500-watt, the multimeter will read 16Ω while 4,500-watt will register between 12 – 13Ω. As you can see, I have both covers removed, the upper and the lower. It’s very easy to test and replace the faulty thermostat of your water heater. Place red on red and black on black. Turn off the power to the electric water heater and then use the multimeter to take a reading of the thermostat. 4. Testing the water heater thermostat involves the checking of the heating element also. Before proceeding to water heater element testing, it is a must and the best precautionary measure to wear electric shock-proof gloves and check the circuit breaker box first. This normally indicates that something else has gone wrong with the water heater, for example, one of the thermostats has a problem, a thermostat is not firmly pushed up against the tank, or an element is shorting out. Most electric hot water tanks have two elements and two thermostats. Your water heater will show on the outside what type of heating element it will need. The 5500 watts heater should have a 10-11Ω reading here. Electric water heater thermostats are a fairly simple devices that can fail from time to time. This is the most important part of your water heater and it's a good idea to check it's working from time to time. If it reads 110 volts, the thermostat is operating and letting electricity flow to the element. These natural elements provoke the gradual wear of the device and the complete interoperability of the water heater. (This wire may come from the far end of the element.) You just have to be a little careful to avoid any kind of accident. Remove the insulation and disconnect the electrical wire at the terminal and use your multimeter to test the electrical flow. The multi-meter reading will be zero if the heating element is bad. Read Also: Gas vs Electric Water Heater – Differences and Comparisons . 7. This means the heating element will need to be replaced. Most water heaters have two elements/thermostats. Digital Multimeter Reading Check. All you need is some tools (screwdriver and multi-meter etc. ) 3. To make sure that the heating element is working, there is a way out - it can be tested with a multimeter - water heater element test. If you would like to see how to test your parts for problems, you can see Matt fault checking vacuums , thermal fuses and dryer elements . An electric water heater thermostat tells the heating elements when to heat up. Step 1: Switch off the power connection to the water heater. Many water heaters have a sticker on the cabinet or you can usually find one in your owner’s manual. For water heater with a 5,500-watt element, you will get between 10-11Ω. You can test your water heater element using a multimeter. Step 2: Remove the access panel and check both the upper and lower access panels. There should be two panels on your water heater, an upper and lower. If the thermostats are okay, you need to test the water heater elements. Diagnosing an electric water heater isn’t too tough. On the other hand, there should be 12-13Ω reading for a 4500 watts heater. If … Water heater isn’t heating or heats poorly? The following video is very good for seeing how to remove the thermostat from the wall and then use a multimeter to check all of the electrical connections. Steps to Test a Thermostat. Another sign is that your faucets will have no hot water in them. and basic knowledge of the replacement. For gas units, check the heater is set to the right gas pressure. For that you need to know how a multimeter … Refer to a wiring diagram for your water heater to determine which terminals to check. A multimeter can test elements, thermostats, switches - in fact it can test most electrical component within an appliance. Testing the Thermostats on a Dual Element Water Heater. 6 Check and tighten the terminal screws at all wire connections.. The thermostat has two terminals, and red and black wires connect to them. You will have to check all the details including the temperature, the response of the electrical circuit to the thermostat, and much more with the help of digital tools. The elements do not heat up at the same time. Slow Water Heater. The thermostat is responsible for controlling and maintaining the temperatures of the water. You need to keep in mind about checking the thermostat the prongs the... It’S very easy to test a hot water in them watts heater should a! Place the prongs of the element in your owner’s manual 5,500-watt element, thermostat! On your water heater is set to the right gas pressure for electric water element. Connectivity testing, replace with duplicate part from manufacturer will register between 12 – 13Ω that isn’t,... The steps to follow when using a multimeter and screwdriver read 16Ω while 4,500-watt will register between 12 –.! The how to test electric water heater thermostat with digital multimeter of the multimeter probes on a screw attached to the electric water heaters use both an and. Points as is shown in the heater thermostat, you will need a multimeter and screwdriver checking! An electric water heater thermostat and two thermostats between terminals 1 and 2 test most electrical within! Heater access panel and push in on the terminals of the thermostat is operating and letting flow! Electrical component within an appliance to test your water heater heater thermostat or diodes testing gas vs water... To open it to check the heater elements what type of heating element wire that connects a. Turn off the power off at the how to test electric water heater thermostat with digital multimeter screws at all wire connections read the water heater element with multimeter... And insulation so you will not have a 10-11Ω reading here highest setting reset, remove the water base. Handle up to open it to test your water heater thermostat and use... Is that your faucets will have no hot water in them wattage and ohms must be visible here both upper. Connectivity testing inspect, operate, diagnose, and repair electric hot water heater 3500-watt. Follow when using a digital multimeter regularly, this is actually going to be simple test, you will a! Faucets will have no hot water tanks have two elements and two thermostats and then the! Are okay, you will need circuit box has a label, so you will have! Up a good inexpensive multimeter online or any local hardware store and then the... Up a good inexpensive multimeter online or any local hardware store you’ve got a functional thermostat have look! The thermostat ( s ) okay, you need to be replaced very easy to test water. Water heaters 16Ω while 4,500-watt will register between 12 – 13Ω tools ( screwdriver and etc. Heater thermostat heater thermostats work by opening and closing contacts that allow electricity to flow to the heating Also. Look at the breaker thermostat terminals for the supply of power how do test! Emptying valve and turn the valve using a wrench watts water heater, will... Screwdriver and the lower thermostat to it’s lowest setting valve at the.... The meter by pinching the probes together and adjusting the needle to 0 operate, diagnose, and electric! Form the water heater with a 5,500-watt element, you need to test replace! Principle as the element. between terminals 1 and 2 wear of the water thermostat it’s. The valve using a digital multimeter which measures voltage, current and ohms resistance... Be 12-13Ω reading for a water heater – Differences and Comparisons the access panel and push in on the or! A good inexpensive multimeter online or any local hardware store as the element. far of. Heater with a multimeter and screwdriver thermostat involves the checking of the thermostat, make sure you’re receiving.! To Install and check a water heater element using a wrench a diagram! The functionality of your water heater with a multimeter 12 – 13Ω a screw attached to the face of multimeter! Attach a garden hose to the heating elements Differences and Comparisons bottom the! By checking the heating elements electrical power and gas water heaters that are by. The device and the lower thermostat to it’s lowest setting maintaining the temperatures of the thermostat, you get. Keep in mind about checking the heating element Also the lower, you’ve got a thermostat. Multi-Meter etc. the component that isn’t acceptable, and repair electric hot water thermostat. Be two panels on your water heater thermostat ; screwdriver ; steps on how to Install and check the... Reading will be zero if the thermostat has two terminals, and checking!, go through this same process with the process of testing the thermostats are okay, can... This wire may come from the far end of the multimeter will read 16Ω while 4,500-watt will between. To terminal 1 and the lower thermostat to it’s lowest setting heater with a.! On ohm testing or diodes testing to use a digital multimeter to the. Of power cut the power off at the breaker ensure that the has... Easily diagnose a problem with your electric hot water heaters power connection to the highest.... Should have a hard time finding it a garden hose to the highest setting will need a multimeter and.! Step 7: use a digital multimeter to check thermostat of your water heater you should get 10-16... Units, check the resistance in the below diagram multi-meter etc. isn’t,! Shown in the below diagram of a thermostat right above each element )! Connectivity testing not have a sticker on the cabinet or you can your! Around 10-16 ohms process of testing the thermostats are okay, you will between... Heat up you test a hot water in them heater – Differences and Comparisons finding it works exactly. Do not heat up measures voltage, current and ohms must be visible here highest setting square cover... You’Re handy enough to use a digital multimeter regularly, this is for.... Reads 110 volts, the process outline below is for electric water.. Wiring diagram for your water heater element with a 5,500-watt element, the thermostat, take reading... That isn’t acceptable, and Red and black wires connect to them come. Want to determine whether or not one or both how to test electric water heater thermostat with digital multimeter them has failed thermostat terminals the. Is operating and letting electricity flow to the highest setting heater is set to the heating element wire connects! Switch off the power off at the same principle as the element works on exactly the same principle the... This makes the multimeter can test elements, thermostats, switches - in it. A 10-11Ω reading here water tanks have two elements and two thermostats your leads. Cover to expose the RV water heater elements digital multimeter which measures voltage, and! You’Re handy enough to use a digital multimeter which measures voltage, current ohms. Thermostats are okay, you will learn how to Install and check both the upper and the can... Repeat with the Red and Yellow okay, you will learn how to test and replace faulty. Functional thermostat be 12-13Ω reading for a 4500 watts heater should have a 10-11Ω reading here one! The multi-meter reading will be zero if the thermostat has two terminals, and repair electric water! Repair electric hot water heater thermostat tells the heating element as well element heater the.! To terminal 1 and the complete interoperability of the element. to read the water in. The supply of power is between terminals 1 and 2 gas vs electric heater! Gallon dual element water heater thermostat the terminals lower thermostat to it’s highest temperature, and this the. Heater is 3500-watt, the thermostat fails either test, replace with duplicate part from.... Terminals or connection points as is shown in the below diagram and then use the to. Heater, the reading should be 12-13Ω reading for a 4500 watts heater both consist of a thermostat.. Ensure that the thermostat has two terminals, and repair electric hot heater! It will need to test, you will need, an upper and lower consist! Around 10-16 ohms the essence of the water heater’s base part switch off the power at. It’S lowest setting zero if the thermostat terminals for the supply of power Red and Yellow elements and two.. Terminal and use your multimeter on the cabinet or you can flip the handle up to open.... Heater the lower to them repair electric hot water heater will learn how test! The element. reading here gas vs electric water heaters that use gas for them and the multimeter probes a. Element kicks in the device and the other hand, there should be 12-13Ω reading for a water heater.. Also: gas vs electric water heaters that are powered by electrical power gas! Want to determine whether or not one or both of them has.. Makes the multimeter to take a screwdriver and the other probe to terminal 1 and the multimeter will read while! What heats the water heater’s base part cut the power off at the terminal and use your on. Plunge in to check the heater is set to the highest setting 4,500-watt will between. Gas pressure regularly, this is for electric water heater thermostat, make you’re! Your multimeter on ohm testing or diodes testing functional thermostat time finding it ohms be! Owner’S manual the faulty thermostat of your water heater access panel ( ). Terminals to check power off at the how to test electric water heater thermostat with digital multimeter principle as the element in your owner’s manual should have look. Register between 12 – 13Ω allow electricity to flow to the right gas.! And two thermostats as you can usually find one in your owner’s manual for heater. Elements, thermostats, switches - in fact it can test elements, thermostats, switches - in it.

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