Having a malfunctioning water heater is a huge nuisance as it is. However, a faulty water heater, even after you’ve replaced the elements and the thermostat, is a whole other issue.
In most cases, the best solution to this problem is simply investing in a brand-new water heater.
However, it is recommended to perform a detailed inspection of your water heater before you replace it, as it may be possible to repair it. Still, you will also learn more about the core issue that may repeat in the future.
Why is your water heater not heating after replacing the elements and thermostat?
When dealing with a faulty water heater, many people focus on the essential elements, such as the thermostat, as they often seem to be the problem.
However, if your water heater is still not heating after replacing these vital components, an underlying issue needs to be addressed.
1. Blockage in the water heater tank
One of the main reasons why your water heater isn’t heating even after you’ve purchased and installed brand-new elements is that it is clogged.
Sediment and mineral buildup can block the heating element from adequately heating the water in the tank.
These clogs can cause a bigger problem than you may realize, as they can also prevent the thermostat from accurately measuring the water temperature.
To fix this issue, you’ll need to flush out your water heater tank and remove any sediment buildup.
2. Wiring issue
Another possibility is that there may be a wiring issue where the power isn’t correctly connecting to the elements.
Even a single loose wire can cause problems with heating. One of the wires is also possibly damaged and needs to be replaced.
If you are not familiar with electrical work, it may be best to call a professional to come and check the wiring for any issues.
However, if you feel confident in your abilities, double-check all wires and connections to ensure they are secure and undamaged.
3. The thermostat wasn’t correctly installed
Another reason the water heater isn’t heating even after you’ve replaced the thermostat is that you haven’t installed it correctly. Ensure the thermostat is properly wired and connected to the power source before assuming it’s faulty.
Additionally, it is necessary to check the breaker or fuse box for any tripped breakers or blown fuses that could be causing a lack of power to the water heater.
If the thermostat isn’t correctly installed, the water heater won’t be able to regulate the temperature accurately. This could lead to inefficient heating or not heating at all.
4. Tripped circuit breaker or blown fuse
One possible issue could be a tripped circuit breaker or a blown fuse. Check your home’s electrical panel to see if the circuit breaker for the water heater has been tripped or if there is a blown fuse that needs to be replaced.
5. Thermostat set too low
After replacing the elements and thermostat in your water heater, double-check that the thermostat is set to an appropriate temperature.
The water may not reach a hot enough temperature if it is too low. Adjust the thermostat as needed and wait for the water to heat up before testing again.
The role of the thermostat in a water heater is to regulate the temperature of the water. If it is set too low, the elements may not be able to heat the water sufficiently.
Check and adjust the thermostat before considering other possible causes for the lack of hot water.
How to fix a water heater not heating after replacing elements and thermostat
If the water heater isn’t functioning correctly even after you’ve installed new elements, you may think that it is beyond repair and that you need to invest in a brand-new heater.
While this may be true in some cases, troubleshoot the water heating system before spending your money on a new heater, as the solution may be closer than you think.
1. Descale the water heater tank
Try descaling the tank to remove all the mineral buildup and gunk from the water heater tank.
This can be done by draining out all the water, filling it with vinegar and water, letting it sit for a few hours, then draining and refilling it with clean water.
Another method of cleaning out the tank is using a descaling product specifically for water heaters. Follow the instructions on the packaging to properly clean out the tank.
You also want to clean the tank regularly to prevent future buildup and maintain the water heater’s efficiency. This can be done every 6-12 months or as needed.
2. Check the connections
If the water heater isn’t heating even after you’ve replaced all the faulty elements, there may be a wiring issue.
To check all the wires and connections, turn off the power to the water heater and remove the access panel.
Carefully inspect all wires to ensure they are securely connected, tight, and not damaged. If any issues are found, call a licensed electrician to repair them properly.
It is also possible that there is a problem with the upper thermostat or high-limit switch, which can be checked using a multimeter.
If these components are faulty, they will need to be replaced by a professional. In rare cases, the issue may lie within the heating element itself, which may need to be replaced.
Be sure to follow all safety precautions and consult with a professional if needed.
3. Check the new thermostat
When installing a new thermostat, make sure to disconnect the power or shut off the gas supply before starting any work on your water heater.
Next, remove the access panel and locate the old thermostat. Disconnect the wires and remove the thermostat from the mounting bracket.
Install the new thermostat by connecting the wires and securing it to its mounting bracket. Finally, replace the access panel and turn the power or gas supply on.
It’s always a good idea to check for leaks before using your water heater again. If you notice leaking, shut off the power or gas supply and call a professional for assistance.
Remember never to touch any electrical components without proper training and always consult the manufacturer’s instructions for correct installation procedures.
It is also necessary to adjust the thermostat adequately. The temperature should be set to 120 degrees Fahrenheit to prevent scalding but hot enough for effective cleaning and disinfection.
Testing the water temperature with a kitchen thermometer before use can ensure it is at a safe and comfortable level.
4. Check the circuit breaker or fuse
In case of a tripped circuit breaker or a blown fuse, it is necessary to reset the breaker or replace the fuse before troubleshooting further.
It may also be helpful to check the power supply to the water heater to ensure it is receiving electricity.
Here are the steps to check if your water heater is receiving enough electricity:
- Turn off the power to the water heater at the breaker box.
- Remove the access panel on the side of the water heater.
- Use a multimeter to test for voltage between the two screws on the upper heating element.
- If there is no voltage present, check for a blown fuse or tripped breaker. 5) If the fuse and breaker are not the issues, there may be a problem with the wiring or power supply.
If your water heater receives enough electricity,
the next step is to check if the heating elements are functioning correctly.
- Turn off the power to the water heater at the breaker box.
- Remove the access panel on the side of the water heater.
- Use a multimeter to test for continuity between the screws on the heating element.
- If there is no continuity, the element should be replaced.
5. Check the thermostat settings
Your water heater may not be heating because the thermostat is too low.
Here are the steps to adjusting your water heater thermostat:
- Turn off the power to your water heater (consult the owner’s manual for instructions).
- Remove the access panel on the side of the unit and locate the thermostat control knob.
- Adjust the knob to a higher temperature setting and place the access panel back.
- Turn the power back on and check if the water is heating properly.
Related: Tall vs. Short Hot Water Heaters
Adrian is an ISCET licensed professional that has completed the National Appliance Service Technician Certification Exam and has the expertise to diagnose and repair any appliance. He is well-versed in the latest technologies and techniques and is always up-to-date on the latest industry standards.
