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7 Common Problems of Water Heaters on Your Home

During the change of seasons, winter, or even summer, the integration of warm water with domestic appliances is extremely necessary and important. From showers and bathtub sinks to cooking, laundry, and chopsticks needs, the average person can use water with different temperatures up to 20 times a day. If you multiply one person's usage by the number of family members, the demand for hot water is enormous. This also puts pressure on your water heater.

You may see a warning sign that your water heater needs to be replaced. Sooner or later, it will come. No matter what the cause is, the excessive use of the machine and the dense frequency may affect the tank's life. Water heaters, even the best ones, only last about a decade. You think you can preserve and extend the machine's life in many different ways, such as annual maintenance, but you still need to replace it because the water tank cannot remain in its original state for many years. This can cause the layers of the bottle to be worn and damaged.. even affecting the family's health. That's why you need to be wise to see the right time to replace the water heater, to help use the device effectively and safely for you and your family members.

1. The water heater is not on the power supply

A water heater that won't turn on is one of the most serious and potentially high-risk problems. So you do not arbitrarily repair the water heater when damaged if you do not know the causes.


  • The power plug is not plugged in

  • Damaged power plug

  • Anti-shock CB disconnected

  • Because the power supply is open

  • The machine damaged the main circuit board, burnt the capacitor, and damaged components on the circuit board.

How to fix:

  • Check if the plug is plugged into the mains or if there is any damage.

  • Check the CB supplying power to the water heater to see if it is disconnected. If the CB is divorced, before re-opening the CB, you need to check the water heater for electrical leakage!

  • If the above steps have been checked, but the machine still does not work correctly, the cause is an open or leaking internal power supply, causing oxidation of the electrical circuit inside the machine.

Note: In case the water heater has damaged the main circuit board, burned the capacitor, or damaged components on the circuit board, you need to call a technician specializing in water heater repair to check and handle the error.

2. The water isn't heating

The water heater is essential to daily life in every family, and suddenly you find that the water is no longer hot.


  • The water heater is not on the power supply

  • Overuse

  • Broken heating element (rheostat)

How to fix:

  • If the water heater does not enter the power source, you can fix it according to the instructions above.

  • Your home's water heater uses continuously, leading to an overload that can cause damage to the tank and the temperature sensor... You need to disconnect the power to the machine to stop working within 1 hour and then turn it back on.

  • If it doesn't work, the heating rod is broken, and you need to replace the new one for the water heater. At this point, you need the support of a professional technical team to solve the problem. Avoid self-repair because it is hazardous.

3. Water heater leak, electric short

Leaking water heaters happen due to many reasons. Frisch will list the leading causes of electrical leaks.


  • The water heater is too old

  • Dirty or contaminated water source

  • The magnesium rod is wholly corroded and continues to corrode the wall of the tank, causing water leakage.

How to fix:

  • For water heaters that are too old, you should consider replacing a new water heater to ensure family safety. You need to treat the water source and remove impurities to help the water heater increase its service life.

  • In case the magnesium bar is corroded, you should contact the service center so that the technician can replace the new magnesium bar for you.

4. Leaking pipes

This is one of the most common problems with water heaters. Leaking pipes lead to wasted water, mold growth, damaged plaster ceilings…or, more seriously, leaks and electrical fires.


  • The water supply line is damaged.

  • The phenomenon of water leakage is due to an open rubber gasket.

  • Containers can rust, creating holes that cause leaks.

How to fix:

  • If it is the cause of removing the rubber gasket and water supply line, it is necessary to replace the rubber gasket and water supply line with new ones. Apply plastic glue to the edge of the water heater at the sealing position to prevent water leakage.

  • If the cause is due to rust, you need to replace the new water heater is the best way.

5. The heating rod is scaled

The heating rod or incandescent is the part that heats the water in the tank quickly. Over time, the heat exchanger will get dirty, leading to a decrease in the efficiency of using hot water.


  • Using the burner for a long time leads to deposits

  • Dirty water is not hygienic

How to fix: Contact a service center or a professional water heater repairer to have them check the thermostat and replace it. Clean the water heater every 1-2 years, and build a water treatment system before using it for the water heater.

6. When the operation makes noise

Cause: Water heaters used for a long time will have deposits around the walls and bottom of the tank. When the machine is working, the water will affect the plaque on the bottle and make a noise.

How to fix: Regular cleaning of the water heater helps remove the dirt on the tank's walls, limiting noise emission. In addition, it is recommended to use an additional water filter system if the water source is contaminated, limestone, dissolved minerals ...

7. Water heater jumps Automat

Automat At is a safe automatic switching device (automatic breaker) commonly used in general electronic equipment and water heaters.

Why does the hot and cold water tank automatically cut off the power?

  • The water heater operates continuously 24/24 and is overloaded with electricity.

  • Electrical leakage

  • The machine's dry fire protection relay unit detects that the water has a higher temperature than the permissible level. It will automatically cut off the current, creating a voltage jump.

How to fix:

  • Do not let the water heater operate 24/24. Turn off the power when not in use.

  • Check for electrical leakage and fix it promptly.

  • Set the allowable temperature on the water heater to avoid the situation being too high, which will damage the equipment inside the tank.

Contact Local Rooter

If you would like a free quote on water heater replacement in San Jose and surrounding areas, our professional plumbers at Local Rooter are here to assist you. Call us at 408-641-9245 or contact us here

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