Home › Friedrich › Air Conditioners › E5 / E6
Friedrich Air Conditioner E5 / E6 Error Code
Room temperature probe open or shorted on Friedrich air conditioners.
FriedrichAll Friedrich air conditioner codes
The indoor probe reads the room air coming into the unit. E5 is an open circuit and E6 is a short. When either happens, the control assumes the room is 90°F (32°C) and keeps running, so the unit may cool nonstop and ignore your setpoint.
Compatible models
Covered by Friedrich's RAC service manual for its 2008-2009 room units, which spans the QuietMaster, XStar, Premium and TwinTemp lines.
Also shown as
These come from Friedrich's room air conditioner service manual, which lists no codes beyond E6.
Difficulty
Try the basic checks, but the usual fix is a technician's job.
Not sure you are reading the code right? See how to read Friedrich air conditioner codes.
How to fix Friedrich E5 / E6
Notice nonstop cooling
If the unit runs constantly no matter what temperature you set, that matches this fault. Turn it off by hand when the room gets cold enough.
Restart once
Pull the plug for a few minutes and plug it back in. If the unit still won't cycle off at your setpoint, stop there.
When to call a technician
A technician needs to test the indoor probe's resistance and replace it. Left in place, a bad probe can let the unit ice up.
Parts linked to E5 / E6
These are the parts most often behind this code. Tap one to see what it does and the signs it is failing.
- room temperature thermistor
- control board
Order parts by your full model number so they fit.
Frequently asked questions
Which Friedrich models show the E5 / E6 code?
Covered by Friedrich's RAC service manual for its 2008-2009 room units, which spans the QuietMaster, XStar, Premium and TwinTemp lines.
Can I fix Friedrich E5 / E6 myself?
Only the basic checks. You can safely try the steps above, but E5 / E6 usually points to a part or fault that needs a technician.
Other Friedrich air conditioner codes
- E1Short cycling or a sensor fault, depending on model
- E2Stuck button or a sensor fault, depending on model
- E3 / E4Frost probe open or shorted
- CHECK FILTERFilter cleaning reminder
Last reviewed 2026-10-19. Codes and steps can vary by model; check your owner's manual.