Mitsubishi E.O. Switch


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Old 07-09-24, 12:08 PM
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Mitsubishi E.O. Switch

I have a Mitsubishi MSZ-FE09NA-8 unit in a third floor (converted attic) bedroom since 2013. It has always worked fine with the remote control and I never tried to use the E.O. Emergency operation switch.

Most of my remote control for about 3 years has been via a Cielo Breez controller and Alexa. The Cielo controller is programmed for various temperature condition and schedules. About a week ago we had some very high temperatures and the room went to about 92 degrees with the A/C off. When I checked to see if a programmed schedule change had occurred, I found the unit in emergency heat/cool operation and blowing heated air (hotter than the room temperature.). The indicator lights on the unit also showed it was in emergency heat/cool mode. When I tried to shut it down using the E.O. button it did not respond. I was able to shut it down via Alexa and the Cielo and then restart it in the correct schedule mode.

A few days later a similar occurrence started the unit in emergency cool-only mode (per the indicator lights.). Again no change with the E.O. button.

After that I used the E.O. button to test response on a similar unit in another room. It acted as expected setting heat/cool, cooling only, and off in sequence.

Doing that I realized a difference in the feel of the two buttons. The first unit button is flat and does not depress. Could this be the result of multiple occasions of 90-100 degree heat? Or just a defective button never used or noticed? Could a defective button that feels like it is pushed in cause the unit to go into emergency mode spontaneously?




Can it be replaced?
 
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Old 07-09-24, 10:59 PM
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No listing in parts manual suggesting you need to change an entire board.
If you take the cover and post a pic of the switch we can probably source one.
 

Last edited by PJmax; 07-10-24 at 06:48 PM. Reason: removed dead links
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Old 07-10-24, 07:21 AM
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Thanks.

The links are not working. Safari gives a "Server not Found" message and Firefox does nothing. I copied the links and they took me to a Mitsubishi Cars page and this message:
Your search - https://www.mitsubi****echinfo.ca/si..._OBB542E_0.pdf - did not match any documents.
I was able to finally find the documents by copying the links and editing them to just the document IDs. I downloaded them but I have not studied them yet to see how to open up the unit. In the meantime, the operation has been normal.

Thanks again!
 
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Old 07-10-24, 06:49 PM
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Apparently Mitsubishi doesn't allow hot linking to their tech info. Sorry about that.

If you didn't get both of them let me know and I'll post it here.
 
  #5  
Old 07-11-24, 12:44 PM
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I got them. Thanks.
 
 

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