FD Error CodeUpdated 4 days ago

Introduction

The "FD" error code indicates a HLP pressure sensor failure. This article is for Vertex Ducted Central Split (DYC-18) systems. 

Cause: The mainboard did not recognize the pressure sensor. 

Troubleshooting Diagram

Troubleshooting Notes

• Begin by checking if the pressure sensor is securely plugged in. 
• Measure whether there is a 5VDC voltage output (red and black wire) from the output port of the mainboard. If there is no voltage output, replace the mainboard. 
• If there is, replace the pressure sensor. 
• Replace the mainboard.