Wire Instructions for wiring a Hayward On-Command to a Hayward EcoStar IS3401VSP


New member
May 19, 2018
This will be my third spring trying to get the Hayward On-Command wired properly to a EcoStar IS3401VSP pump

Does anyone have updated wiring instructions.

I have one set of instructions that wires the pump to the Hayward control on the pump and uses the COMBUS ports to the ON-Command
A second set of instructions that eliminate the Hayward Pump wiring and go direct to the On_command

Two different people at Hayward give me two different answers and either way I cannot get the pump and the On-Command to operate properly without error codes


Gold Supporter
TFP Guide
Jul 21, 2013
Northern NJ
It sure sounds to me like you may have a hardware problem at the pump or On-Command and not a wiring problem.

Bama Rambler

Mod Squad
TFP Expert
LifeTime Supporter
Jun 22, 2009
SouthWest Alabama
A couple of things.
1) How are you wiring them together?
2) What are the errors that you're getting?

You should be connecting terminal 2 on the Remote RS-485 terminals of the command unit to terminal 7 on the ComBus terminal on pump drive, and 3 on the Remote RS-485 terminals of the command unit to terminal 8 on the ComBus terminal.