Thermo King Codes

[sneaquie]

I have a 2000 Thermo King SBIII SR+ with alarm codes 3 (Return Air Sensor),4 (Discharge Air Sensor), and 12 (Sensor Shutdown). Can anyone help me out with this problem? Tell me where on the unit to find this/these sensors, how to change them etc. Any help is appreciated.:)

[abbsnowman]

Sneaquie, sounds to me like you may have other issues. I would check the plugs on the micro. They often require periferial seals. (Small round grey orings). Clean, inspect for wear, put super lube on and put back together.
There can also be other issues such as poor grounds etc. Anytime you see multiple codes, I always suspect there may be more than meets the eye.
As far as your question:
Return and supply sensors are exactly what they sound like, they are behind covers in the evap section in the described sede if airflow.
Hope this helps!

[utc/tk foreman]

also make sure all sensors are hardwired in back. the deutch plugs that tk uses are junk, and the best thing to do is just eliminate them. It's actually at thermo king tsb update.