Question about Comfort Zone CZ1500WC Infra-Red Utility/Portable Heater

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My Comfort Zone Utility/portable infrared heater, model CZ1500-WO is displaying an AOS error code and will not turn on. What does that mean and can it be repaired?

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  • seashell518
    seashell518 Oct 18, 2012

    I sent my circuit board to Lee Kreuzer (see his note below) and he repaired it and mailed it back quickly, only cost $45. He will tell u how to remove the circuit board, quite easily done.

  • KD Grayson Heating,Air conditioning & Refrigeration

    Add aComfort Zone CZ2011P Infrared Quartz Space Heater - Heats up to 1000 sqr/ft Comment



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If the relays are clicking there is 2 1000 uf capacitors on the board that if looked at from the side they will be domed they are bad. Replace and the problem is solved.

Posted on Jan 11, 2013

  • Ed Weekes Sr.
    Ed Weekes Sr. Nov 10, 2013

    $3 for 2 capacitors at Radio Shack and about 30 minutes total saved an $87 board, even repaired the first 1 for a back-up at that price


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The control board needs to be repaired. You can get in contact with me at

Posted on Mar 08, 2012


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Any electric heat thats not a heat pump, is 100% efficient converting 1 Watt into BTU's or 1 Watt = 3.145 BTu's.
Only a heat pump can offer you more heat per watt.Consequently any inexpensive heater will replace that unit! and for far less than the labor to even diagnose that thing, let alone parts avaiability! I would not repair it or try unles as a DIY job for kicks.

Posted on Feb 25, 2012

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Posted on Jan 02, 2017

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SOURCE: comfort zone infrared heater

Hello all , just push and hold the two buttons on the right for 3 seconds and it will reset. Joe

Posted on Oct 14, 2008

  • 76070 Answers

SOURCE: I have an AO5 error

what is A05

Posted on Sep 10, 2010

  • 1 Answer

SOURCE: My comfort zone infrared hearter

Hi. I have the Comfort zone 1500 (cz 1500) and just ran into this AO5 problem. Turns out the thermostat was set lower than the actual room temperature. I just turned up the heater temp and it kicked right on. Hope this helps!

Posted on Nov 24, 2010

  • 14 Answers

SOURCE: i need 2 heating elemements

You can order them from True Green 800-595-9605

Posted on Dec 03, 2011

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SOURCE: I have a comfort zone

Unless you want a new house, stop using that heater immediately. There are severe internal electric problems with your heater. Since it's already 3 years old, I'm not sure it's worth trying to repair. With what you described, I'm surprised it didn't trip one of you circuit breakers.

Be safe, Don't continue to try to use this heater.

Posted on Jan 20, 2011

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Comfort zone infrared heater keeps flashing A05 what does this mean?

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Where can i order a new board for my comfort zone cz1500 the board is bad showing aos code.

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Error code AOS

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Nov 18, 2013 | Comfort Zone CZ1500WC Infra-Red...

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Flashing AO5

if the relays are clicking there are 2 1000uf capacitors on the main board that will be bad. If you know how to work on electronics you can unsolder and then replace them problem solved I just fixed my dads heater today cost about 2.00 bucks :). The capacitors have to be 1000uf 105c google them.

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Why does my comfort zone infrared heater shut off after I turn it on? What modes does it have?

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Settings on my CZ 1500

To switch between C and F, hold DOWN and ENTER for three seconds.
( I sell these. )

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