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I have the Comfortzone Infrared heater. The heating unit will not kick on. It tries to but then a code comes up that looks like AOS or AO5.

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Sounds like the outlet is not enough power for the heater. Remember with an electric heater youre dealing with watts and amps, It should be plugged into its own dedicated service for proper operating.

Posted on Mar 04, 2011

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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

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


A05 code is over heat error, unit has to be cleaned thoroughly. take unit apart and clean, I use a rag,brush,vacuum and compressed air. .
press the helpful button and check links below on disassembles.

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Jan 30, 2016 | RTO Comfort Zone Electric Portable Space...

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 [email protected]

Jan 08, 2016 | 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...

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

2 Answers

Comfortzone heater displaying error message doFL.


According to the call line, hold down the up, down and enter buttons all at the same time and it should clear it. I took mine back and had it replaced so I never had a chance to try this.

Dec 29, 2009 | 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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