Error codes for AO Smith Water Heater

AO Smith is a brand of water heaters that is well known for its quality and durability. The company was founded some time ago. Since then, it has been producing a wide range of water heaters and furnaces. The company has earned a reputation for offering quality products at affordable prices.

It has a wide range of water heaters for different applications. This includes both residential and commercial applications. It has been some time since the company started selling its products, and it is still going strong. The company is well known for producing reliable products that are known for their efficiency and durability.

However, there are some common issues that homeowners have with their AO Smith water heaters. These issues can lead to dangerous situations and even expensive repairs. The purpose of this article is to provide a comprehensive guide on how to identify these common issues so that you can be able to solve them quickly and effectively. Let’s check out some of the common problems and their possible solutions.

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Error code 031

A mistake in setting the dip switch. Usually that is related to the gas type. There is a switch on the computer board. Check that it is in the correct position.

Error code 101

Proper gas combustion is not allowed. Check to see if there is a blockage in the airflow at the heat exchanger, the venting system, the fan, and the burner. And then clean it. Abnormal gas combustion may also occur due to extreme weather conditions, such as high winds or incorrect pressure of gas.

Error code 111

It was a failure in the ignition system. You must also check that the hi-limit switch hasn’t tripped. The gas supply is right, the flame sensor is clean, the ignitor produces sparks, and the venting system isn’t blocked. Ensure that the PC board, the cut-off fuse for overheating, and the gas valve are still operating. So it is possible that the gas line needs to be purged because there is air.

Error code 311

One thing that can cause this is the output thermistor failure (located on the heat exchanger). Check the wire connections – they should not be loose, there should not be burns, cuts, etc. Clean the thermostat or replace it if it is broken.

Error code 321

Inlet thermistor, which is located inside the water inlet. Check the wires and clean the thermostat, or replace it if the thermostat is broken.

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Error code 331

Failure of mixing thermistor (located in the water outlet). The same principle applies to both the inlet and output thermometers. When testing the resistance values of the mixing outlet and inlet thermistor, it is recommended that the resistance value is about 9.0 kOHM.

Error code 341

A failure of the exhaust thermistor (located above the heat exchanger). The resistance value of the solution should be 10.75 kOHM.

Error code 391

Failure of the air-fuel ratio rod (AFR). Check that the wires are connected and clean the rod. Replace it if you are required to.

Error code 441

You must check the flow sensor for debris. Clean the filter at the inlet, and make sure that the wires are not loose on the PC Board.

Error code 510

If the gas valve fails, check the pressure of the gas and the connections of the gas.

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