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Atwood Furnace Fault Codes

How to Troubleshoot and Fix Common Atwood Furnace Fault Codes: Simple Guide

If you own a motorhome or RV, you know how important it is to have a reliable furnace that can keep you warm and comfortable in any weather. However, like…

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If you own a motorhome or RV, you know how important it is to have a reliable furnace that can keep you warm and comfortable in any weather. However, like any appliance, furnaces can sometimes malfunction and display error codes that indicate what the problem is. 

In this article, we will explain what some of the most common Atwood furnace fault codes mean and how to troubleshoot and fix them.

But before troubleshooting, what are they?

What are Atwood furnace fault codes?

Atwood is a popular manufacturer of furnaces for motorhomes and RVs. They have a range of models with different features and benefits, but one standard feature is the LED display that shows fault codes whenever the furnace controller is unable to perform a routine function. 

These codes allow users to easily understand which process in the furnace has failed or will fail soon.

The fault codes are displayed as a series of flashes on the LED light, followed by a three-second pause. The number of flashes corresponds to a specific error code that can be looked up in the manual or online. 

Some faults will cause the furnace to lock out as a safety precaution, while others will allow the furnace to continue operating until the problem is fixed.

READ: RV Furnace Troubleshooting Made Easy

How to reset an Atwood furnace

If your furnace goes into lockout mode, you need to perform a reset to see if this resolves the problem. To reset an Atwood furnace, follow these steps:

  • Turn off the thermostat and lower the temperature setting so that the fan stops running.
  • Turn off the power switch on the furnace or disconnect the power supply.
  • Wait for at least 15 seconds before turning the power back on.
  • Turn on the thermostat and raise the temperature setting to start the furnace.

If the furnace does not go into lockout mode again, then the problem may have been temporary or resolved by the reset. However, if the furnace goes back into lockout mode or displays another fault code, then you need to take further action.

How to troubleshoot and fix common Atwood furnace fault codes

Here are some of the most common Atwood furnace fault codes and what they mean:

  • One flash: This indicates a problem with the airflow or the limit switch. The limit switch is a safety device that prevents the furnace from overheating by shutting it off when it reaches a certain temperature. The airflow problem could be caused by a dirty or clogged filter, blocked vents, or a faulty fan motor. To fix this problem, you should check and clean the filter, clear any obstructions from the vents, and inspect the fan motor for any damage or wear. If none of these steps work, then you may need to replace the limit switch or call a professional for assistance.
  • Two flashes: This indicates a problem with the flame sensor. The flame sensor is a device that detects if there is a flame present in the burner. If there is no flame, the sensor will shut off the gas valve to prevent gas leakage or explosion. The flame sensor problem could be caused by dirt or soot buildup on the sensor, a loose or damaged wire connection, or a faulty sensor itself. To fix this problem, you should clean the sensor with a soft cloth or brush, check and tighten any loose wires, and replace the sensor if necessary.
  • Three flashes: This indicates an ignition lockout fault. This means that the furnace has failed to ignite after three attempts and has gone into lockout mode for safety reasons. The ignition problem could be caused by low gas pressure, dirty or corroded electrodes, faulty spark generator, or faulty gas valve. To fix this problem, you should check and adjust the gas pressure, clean and inspect the electrodes, test and replace the spark generator or gas valve if needed.

READ: How to Fix an RV Furnace That Won’t Stay Lit

Conclusion

Atwood furnaces are designed to provide reliable and efficient heating for your motorhome or RV. However, sometimes they may encounter problems that require troubleshooting and fixing.

By understanding what some of the common Atwood furnace fault codes mean and how to reset and repair them, you can save time and money and enjoy your camping trips without any worries.

If you found this article helpful, please share it with your friends and family who may also own an Atwood furnace. Read more posts here.

HVAC aficionado, keeping temperatures just right and comfort levels off the charts. Connect with me on LinkedIn for cooling insights and follow me on Twitter for heating up the HVAC conversation. Let's create the perfect climate together!

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Hi there, I'm Robert Brooks

Hi there, I'm Robert Brooks

I’m so glad you are here! Welcome to my website, where I’ll share easiest HVAC troubleshooting tips, buyers guides, and everything about HVAC cooling and heating system. Learn more about me.

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