Trouble Code and suggested setting for a 17,000lb truck

[R.Minster]

I have a Predator U7170 version 9R04 on my 2000 Ford F550. I'm getting a fault code of P0541 "Intake Air Heater A circuit low".

1. Can anyone explain what that fault might be?

2. I have 3 performance settings to choose from (Tow/Econ, 85 H.P. and 110H.P.) and with my truck weighing 17000 lbs. I figure it's like towing everywhere I drive and the 85 H.P. setting I want to use, says not to tow with it. Am I currect in "only" using the lowest Tune that says it is for towing with fuel economy in mind?
B.T.W. my truck often runs idle for hours at a time to operate the P.T.O. and everything about it is stock.

Is there a custom tune available for my particular situation or do you think it would be ok to use the 85 hp setting except for when I do tow?

Please help as I do not want to cause any damage to my truck/equipment as it's proper operation is vital to my Business.

[R.Minster]

Thanks so much, really appreciate all the help...

[R.Minster]

Sorry, i'm frustrated.
Forget about the trouble code. Is it safe to drive a 17,000lb F-550 in "ANY" other tune then the econ/tow. Like I mentioned above, with that kind of weight on my truck, I "assume" it's just like towing as far as the engine is concerned. The 85 hp tune says "not" to tow with it and i'm not but the truck weighs alot.
Is it "safe" to install and drive with the 85 hp tune or am I limited to the "econ/tow" tune for safety? Is there a custom tune to fit my needs better?
Some advice on the matter would be helpful because to be honest, I know just about nothing when it comes to engines...

[mikel]

Id suggest not using the 85 tune, stick with the tow tune whenever you have a load on the back.

Did you ever see that code before you had the tune in the truck?