H2 & P1 Error CodesUpdated 4 days ago

Introduction

The "H2" and "P1" error codes indicate high pressure switch protection. This article is for Vertex Ducted Central Split (DYC-18) systems. 

Cause: The high-pressure port is an open circuit. 

Troubleshooting Diagram

Troubleshooting Notes

• Check whether the high-pressure switch wiring is firm and confirm the wiring is normal. 
• Check whether the condenser has poor heat dissipation and ensure there is no problem with heat dissipation. 
• Connect the pressure gauge, run the unit, and check the high and low pressures. If the pressure is normal, unplug the pressure switch and measure the resistance. If it's infinite, replace the pressure switch. If the resistance of the pressure switch is 0, replace the main control board. 
• When connecting the pressure gauge for testing, if the pressure gauge pressure is too high, it is a system problem. Check for system blockage and excessive refrigerant, as well as vacuum.