PC & H7 Error CodesUpdated 7 days ago

Introduction

The "PC" and "H7" error codes indicate a wet operation malfunction. This article is for Vertex Ducted Central Split (DYC-18) systems. 

Cause: The superheat T5-T3 is less than or equal to 41°F (5°C). 

Troubleshooting Diagram

Troubleshooting Notes

• Measure the resistance of the T3 and T5 sensors too see if they're normal. 
• Power off and restart the machine. When the machine is running, use an infrared thermometer to measure the actual T3 and T5 temperatures. At the same time, check the 6th and 8th parameters on the display board. Measure and check every minute, recording everything until the machine stops. 
• Observe whether the measured values are consistent with the spot check values. If they're not consistent, replace the main control board. 
• When the measured value is consistent with the spot check value, observe whether T3-T5 is less than 41°F (5°C). If it's not less than 41°F (5°C), replace the main control board. 
• If T3-T5 is indeed less than 41°F (5°C), then there is a problem with the system. Check the installation, such as pipeline blockage, air mixing in the pipeline, etc.