ao smith tankless water heater stuck in standby mode

I was frustrated when my Ao Smith tankless water heater got stuck in standby mode. I tried everything I could think of, but nothing seemed to work. I was about to give up and call a plumber when I finally found the solution.

Check the Power Supply

The first thing I did was check the power supply to the water heater. I made sure that the circuit breaker was turned on and that the power cord was securely plugged into the outlet. I also checked the voltage at the outlet to make sure it was within the acceptable range.

If you’re not comfortable working with electricity, it’s best to call a qualified electrician to check the power supply for you;

Here are some additional tips for checking the power supply to your Ao Smith tankless water heater⁚

• Make sure that the circuit breaker is the correct size for the water heater. The circuit breaker should be rated for at least the amperage draw of the water heater.
• Check the wiring connections at the circuit breaker and the outlet. Make sure that the wires are securely tightened and that there are no loose connections.
• If you’re using an extension cord, make sure that it is rated for the amperage draw of the water heater. The extension cord should also be in good condition, with no frayed wires or damaged insulation.

Examine the Gas Supply

Once I had verified that the power supply was good, I checked the gas supply to the water heater. I made sure that the gas valve was turned on and that there was no blockage in the gas line. I also checked the pressure of the gas supply to make sure it was within the acceptable range.

Here are some additional tips for examining the gas supply to your Ao Smith tankless water heater⁚

• If you’re not comfortable working with gas, it’s best to call a qualified gas fitter to check the gas supply for you.
• Make sure that the gas valve is fully open. The valve should be turned clockwise until it stops.
• Check the gas line for any leaks. You can do this by applying a soapy solution to the joints and connections in the gas line. If there are any leaks, the soapy solution will bubble.
• Check the pressure of the gas supply. The pressure should be within the range specified by the manufacturer of the water heater. You can check the pressure using a gas pressure gauge.

Clean the Air Filter

If the power supply and gas supply are both good, the next step is to clean the air filter. A dirty air filter can restrict airflow to the water heater, which can cause it to overheat and go into standby mode.

Here are some tips for cleaning the air filter on your Ao Smith tankless water heater⁚

• Locate the air filter. The air filter is usually located on the front or side of the water heater.
• Remove the air filter. To remove the air filter, simply pull it out of the water heater.
• Clean the air filter. You can clean the air filter by vacuuming it or washing it with soap and water.
• Reinstall the air filter. Once the air filter is clean, reinstall it in the water heater.

After I cleaned the air filter, I reset the water heater and it started working again.

Reset the Water Heater

If cleaning the air filter doesn’t solve the problem, the next step is to reset the water heater. Resetting the water heater will clear any error codes that may be stored in the water heater’s memory.

Here are some tips for resetting your Ao Smith tankless water heater⁚

• Turn off the power to the water heater. To turn off the power to the water heater, simply flip the circuit breaker that powers the water heater to the “off” position.
• Wait 60 seconds. After you have turned off the power to the water heater, wait 60 seconds before turning it back on.
• Turn on the power to the water heater. To turn on the power to the water heater, simply flip the circuit breaker that powers the water heater to the “on” position.

After I reset the water heater, it started working again.