P5 Error CodeUpdated 3 days ago

Introduction

The "P5" error code indicates an outdoor coil temperature over-high protection in Cooling mode. This article is for Vertex Ducted Central Split (DYC-18) systems. 

Cause: The condenser temperature sensor detects the temperature is too high (More than 140°F / 60°C)

Troubleshooting Diagram

Troubleshooting Notes

• Connect a pressure gauge to measure whether the return gas pressure is too low (normally 0.7-0.9 Mpa). If the pressure is too low, add refrigerant. 
• Measure the resistance of the temperature sensor and check whether it drifts by comparing it with the resistance table. If it drifts, replace the sensor. 
• If the temperature sensor resistance is normal, check the exhaust in item 8 and compare it with the actual exhaust temperature. Use an infrared thermometer to measure the exhaust temperature. If the temperature of the main control board is unreasonable, replace the main control board. 
• If the above steps are normal, check whether the refrigerant system is normal, such as return air blockage, poor evaporation, compressor wear, etc.