1st, try a header calibration.

• Cycle your combine key, then with the switch in HT, press the head all the way down and hold for ~ 3 seconds.
• Note the reading in the cornerpost - does it drop to 2?
• Now press and hold the header raise button. Head should raise ~1 ft, pause, then continue all the way up. If it does, retry AHHC.

If not, do you have an S0 or S1 error code in the cornerpost?

• S0 means you have a feederhouse position sensor error, which can screw up AHHC.
• S1 means a header sensor fault - Sorry, but you likely need to grab a voltmeter.

At the 3 pin round plug - backprobe the wires with it still connected (please don't slice them open....use a paperclip or real backprobe to slip in past the rubber seal), motor running. Measure DC volts to a clean ground bolt.

• A - should be 7.0-7.5V
• C - should be 0.5-1.0V
• B - Sensor signal. Should be ~2V smashed on ground, ~6V off ground

If A or C above is not right, check your combine & feeder wiring for breaks or faults.
If A & C are correct, but B is not: adjust, test or replace sensor on header.

Another way to test the header side is to use Ohms Setting on DVM.

• Disconnect plug from combine
• Measure across A & C in the header plug - should be ~ 1 KOhm. (1000)
• Measure across B to C - should be a 100-900 Ohms and change when you raise/lower the header.
• If 1st is true but 2nd is not, replace the sensor.

 

1st, try a header calibration.

• Cycle your combine key, then with the switch in HT, press the head all the way down and hold for ~ 3 seconds.
• Note the reading in the cornerpost - does it drop to 2?
• Now press and hold the header raise button. Head should raise ~1 ft, pause, then continue all the way up. If it does, retry AHHC.

If not, do you have an S0 or S1 error code in the cornerpost?

• S0 means you have a feederhouse position sensor error, which can screw up AHHC.
• S1 means a header sensor fault - Sorry, but you likely need to grab a voltmeter.

At the 3 pin round plug - backprobe the wires with it still connected (please don't slice them open....use a paperclip or real backprobe to slip in past the rubber seal), motor running. Measure DC volts to a clean ground bolt.

• A - should be 7.0-7.5V
• C - should be 0.5-1.0V
• B - Sensor signal. Should be ~2V smashed on ground, ~6V off ground

If A or C above is not right, check your combine & feeder wiring for breaks or faults.
If A & C are correct, but B is not: adjust, test or replace sensor on header.

Another way to test the header side is to use Ohms Setting on DVM.

• Disconnect plug from combine
• Measure across A & C in the header plug - should be ~ 1 KOhm. (1000)
• Measure across B to C - should be a 100-900 Ohms and change when you raise/lower the header.
• If 1st is true but 2nd is not, replace the sensor.

thanks will try.

 

I run mine in HT mode instead of Float.

 

I didn't even notice that in the OP.....

Float mode is actually only using the feeder lift cylinder pressure to "float" a head on the ground - its really designed for Pickup heads sitting on wheels. Many of these combines are not even equipped with that sensor, and as such, Float mode will not function at all. It does not work with the header sensor at all.

HT is the only mode that looks at the height sensor on the header as the input - and should be used for any head with a active height sensor.