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

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Comfort zone heater stopped working. I keep getting "AOS" when I go to turn it on. What does that mean and how can I fix it. Maybe it is "AO5".

It's been working just great until today. I turned it on and it gives the AOS or 5, which ever that last character is... We are having a little warm up so I won't freeze but certainly want it fixed ASAP so I have it when it turns cold again. Please respond quickly so we can get on it. Thanks much.

Posted by Anonymous on

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Posted on Jan 02, 2017

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SOURCE: 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?

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

Posted on Mar 08, 2012

  • 2 Answers

SOURCE: 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?

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

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1 Answer

Have a comfort zone inferred heater that the display comes on but won't heat up. When I try and turn up temperature I get a AO5 code. What does this mean?


Make sure the unit is clean. Especially, the blower wheel. If that doesn't resolve your error code then follow these instructions.
http://screencast.com/t/RoXS239ndAhF
Look that over please, you can clean the blower wheel at the red arrow, jumper the two switches at the blue arrows as *brief tests only* just to see if the unit runs and begins to heat with the jumpers in place.
If it runs, replace the item that failed open.
If it does not run, the control module, Item 5 marked with green is most likely bad and needs to be replaced.

Jan 20, 2017 | Comfort Zone Heating & Cooling

1 Answer

A05 on screen. Will not let me change temperature. Will not come on.


turn on heater ao5 comes on hit temp switch clicks but goes back and forth from ao5 to temp degree is it the printed circuit board please email at archieholdsworth@yahoo.com

Jan 08, 2016 | Comfort Zone CZ1500WC Infra-Red...

1 Answer

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


It's probably some swolen electrolytic capacitors that need replacing. If you know of an electronic shop close by or buddy that can solder maybe you can remove the pcb and take it to them. Radio Shack may stock the caps.

Jan 15, 2015 | Comfort Zone CZ1500WC Infra-Red...

1 Answer

Error code AOS


its show flashing AO5 code and than shut off

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

1 Answer

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.

Jan 04, 2013 | Comfort Zone CZ1500WC Infra-Red...

2 Answers

I have a Comfort Zone CZ1500W showing an AO5 error code. I have 9 ohms across each element. The fan thermostat reads open. When I bypass it the fan runs, but no heat. The element thermostat reads


Everytime I turn on the CZ heater, the display reads A05 and then it goes away when i set the temp. As far as I can see and feel, I'm not experiencing any issues with the heating, fan, or thermostat or the extension cord running hot. I'm concerned that something could be wrong or unsafe, with Comfort Zone filing for Chapter 7, anyone know who is offering support or a number I can contact?

Dec 02, 2011 | Comfort Zone CZ1500WC Infra-Red...

1 Answer

My comfort zone infrared hearter has a display message of A05 and will not run, what does that mean? How can I fix it?


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!

Nov 16, 2010 | Comfort Zone Heating & Cooling

1 Answer

My Comfort Zone Infrared heater by Earthwise is showing two different faults on the display, ao5 and doFL, what do they mean?


this means if it does not reset by pushing up,down,enter and clears and no heat then the main control board is shot i have 2 in my shop and the capacitors have popped

Oct 30, 2010 | Heating & Cooling

4 Answers

Comfort zone infrared heater


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

Oct 03, 2008 | Comfort Zone Heating & Cooling

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