Question about Comfort Zone Heating & Cooling

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I have an AO5 error code when I turn on the Comfort zone 1500 electric infrared heater. What's the problem?

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  • mnisly Sep 09, 2010

    It was unplugged for several days. There is a regular clicking sound when plugged in, like a relay clicking on and off--along with the A05 error message.

  • mnisly Sep 10, 2010

    No one answers the phone number you gave me, and the voicemail box is full there. I am very capable of changing an electrical component if I know which one it is, and if I can get a replacement part. Any help to narrow it down would be appreciated. I live in a pretty remote area of Northwestern Ontario, so it's not easy to get it to a service centre.



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What is A05

Posted on Sep 10, 2010

  • Lee Kreuzer Dec 26, 2011

    A05 is the PROGRAMING of the board. This should appear when the unit has been energized. The fix to your problem can be repaired in my electronic lab. I have been repairing these units ever since they were on the market. If the unit flashes the A05 code or something that can't be read it is time for repair. The repair costs $50 if you can drop of the unit in the western New York area. $75 if the unit has to be shipped to me. Don't worry too much that your heater doesn't operate the fix solves that problem. This has been happening to these units since they made them. Contact me at


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This indicates a power fault inside the actual heater. Have you tried unplugging the heater, letting it sit for a good 2 minutes, and replugging it back in? If the problem persists you will unfortunately need a repair. Please let me know if you need more information on this. You can also contact comfort zone, the manufacturer, located in Canada, at 780-420-6572.

Thanks so much for the question,


Posted on Sep 09, 2010

  • 2 more comments 
  • Tim Grayson
    Tim Grayson Sep 09, 2010

    Ah yes, unfortunately that is a fairly major electrical issue and there is no easy repair. Are you very confident in your electrical skills, it is very dangerous to try and repair a heater if you've never done it before. You may be able to get it working but risk it getting too hot and catching on fire.... :/

    Please let me know, my personal recommendation is to contact Comfort Zone and see if it is still under warranty. Then from there, if it is not, I would contact a repair shop in your area. If you need help locating one please let me know (along with your zip code) and I will find one for you.


  • Ziva1 Dec 02, 2010

    Tim, the number listed has a gal answering with a last name so I don't think this is the correct company phone number? Why do you think finding this company is so difficult, typing their name into search just keeps giving other websites?

  • alanhvacr Dec 08, 2010

    I have the same error code is this a problem with their systems? Was anyone able to figure out the problem?

  • bethqclimer
    bethqclimer Oct 07, 2012

    we have been having the same problem, what is the solution??? spent several weeks at the beginning of the year calling the company to get anwers, however they only have a number you leave a message with, they call back at the times you tell them you aren't available...I would just like to get this issue resolved and be able to use my heater



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