Atc Fault Code 128; Atc Fault Code 129 - New Holland T8010 Manual

Cause:
Wire harness/connector failure
Temperature pot failure
ATC module failure
Possible failure modes:
ATC module defaults to 72
Solution:
1) Disconnect temperature pot and verify its operation. Its resistance should vary when rotated. Replace if faulty.
2) Inspect harness and connectors for possible shorting between temperature pot wires and other wires or possible
open condition. If a short or open exists then replace harness.
3) If no fault found with temperature pot, wire harness, or connectors, then replace ATC module.
Cause:
Wire harness/connector failure
Mode pot failure
ATC module failure
Possible failure modes:
ATC module (Manual Mode) - defaults to Defrost mode.
ATC module (Automatic Mode) - defaults to Automatic mode.
Solution:
1) Disconnect mode pot and verify its operation. Its resistance should vary when rotated. Replace if faulty.
2) Inspect harness and connectors for possible shorting between mode pot wires and other wires or possible open
condition. If a short or open exists then replace harness.
3) If no fault found with mode pot, wire harness, or connectors, then replace ATC module.
Section 50 - Climate Control - Chapter 1
ATC Fault Code 121
Temperature select pot open or shorted to power
o o
F (22 C) setpoint.
ATC Fault Code 122
Mode select pot open or shorted to power
50-1-21