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Air Flo Sand / Salt Spreaders

Troubleshooting Guide
Air-Flo Model D3555PV

D3555PV Reference Guide     D3555PV Datasheet

Status LEDs
Power On solid green when unit is running
Pause / AUX On solid for pause, flash for running with AUX, off for normal running
Spinner / Conveyor Off means normal, on or flash means error (see table below)

Main power into the MIDDLE PORT only!

Basic Troubleshooting

Troubleshooting a D3555PV malfunction is fairly simple. When one or both of your motors are having a problem, the status light for that motor will blink out a code to tell you what is wrong. The blink codes for this model are:

Status LED Blink Codes
Number of Blinks Condition
SOLID Ignition off / disconnected
2 Jam (high current)
3 Overheat
4 Battery voltage low
5 Battery voltage high

Ignition Off / Disconnected -- Both Status Lights On Solid

This means either the vehicle power is not turned on, or the D3555PV has been disconnected from the vehicle ignition. Many clients, when uninstalling a unit or moving it to another vehicle, either forget to reconnect the unit to the vehicle ignition or accidentally tear the ignition wire out and damage the unit.

If there's a red wire going from the unit to your vehicle ignition, the vehicle power is on and you still see both status LEDs on solid, the unit should be returned for service or replaced (depending on whether or not you have a valid warranty or service agreement in place).

Jam -- One or Both Status Lights Blink Twice

This means something is causing the system to draw too much power, so the unit shuts down for safety. The load of material (sand, salt, etc.) could be frozen, a mechanical shaft or linkage could be bent out of true, there could be a piece of crud caught somewhere.

The easiest way to troubleshoot this is with a clamp-on DC amp meter, like one of these:

Uni-Trend UT-203
Available on eBay for about $40
Mastech MS2108A
Available on eBay for about $40
Amprobe ACD-52NAV
Available at Granger for about $300

These meters can be bought online. We use the Amprobe model in our shop. You can use any model you like so long as it reads DC current up to at least 100A. A peak function helps, because that tells you at a glance what the max current draw was before shutdown.

Hang the meter off one of the main power wires (red or black, doesn't matter) going into the unit, stand clear of the spreader, then turn the unit on and run the motor that was throwing the jam code.

If you run the spinner motor and see a reading above 20A for 2 seconds or more, or if you run the conveyor motor and see a reading above 38A for 2 seconds or more, the system is drawing too much power and the unit is doing exactly what it is supposed to be doing, protecting you from an electrical fire. Check for crud or bent parts, because the unit is working fine.

Those numbers are +/- 10%, by the way.

If you're getting a jam without a current reading that high, something is wrong with the unit and it should be returned for service or replaced (depending on whether or not you have a valid warranty or service agreement in place).

Overheat -- One or Both Status Lights Blink Three Times

Do not install a controller under a heat vent. If you must install a controller where warm air will be blown on it, please install an appropriate sheild between the unit and the vent so that the warm air is directed away from the controller.

These units draw a lot of power to do their job, and power translates to heat. Each unit uses the metal case to help get the heat out, but if you work a unit hard for long enough, it might get hot and tired and need a break.

If the inside of the vehicle where the unit is running is especially warm, or if you pile things on top of the unit, that cuts down on its ability to get rid of heat and may trigger an overheat alarm. Try letting the unit cool off, then turning the heat down and making sure it is exposed to the open air.

If that doesn't help, it may need to be returned for service or replaced (depending on whether or not you have a valid warranty or service agreement in place).

Voltage Bad -- One or Both Status Lights Blink Four or Five Times

This usually indicates a problem with the vehicle's electrical system.

Unit Compatibility

These units are able to drive a variety of spreader systems. The following are Buyers and SnowEx models that the D3555PV can drive:

Compatibility Chart
Buyers and SnowEx Models
Buyers SnowEx
ATVS15 TGSUV1B 375 11875
TGSUVPROA TG01 575 Vee-Pro
TGS01A TGS01B 1075 V-Maxx
TGS05 TGS05A    

Other questions?

If you're running a D3555PV and still have questions, you can send them to us at

Want to Return a Unit for Service?

Click on over to our Return Authorization Request form.