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<h2 id="introduction"><u>Introduction</u></h2><p>The &quot;P5&quot; error code indicates the system is undergoing sub-cooling protection in Cooling/Dry mode. The error code is for Diamante series systems.&#xA0;</p><h2 id="troubleshooting"><u>Troubleshooting</u></h2><p>In Cooling or Dry mode, when the indoor unit&apos;s evaporator coil temperature is IPT (Indoor Pipe Temperature) &lt; 34&#xB0;F (1&#xB0;C) continuously for 3 minutes after the compressor starts up for 6 minutes, the CPU will turn off the outdoor unit and display the error code.&#xA0;</p><h2 id="troubleshooting-diagram"><u>Troubleshooting Diagram</u></h2><p><img src="https://attachments.gorgias.help/Q9r0k7BYaV2vg13y/hc/9JWjXVxG8m6DvMqm/2025111319-add5f670-9078-43e9-ab01-d2bea4475e02-wyt17_p5_troubleshooting.png" style="width: 1000px;" class="fr-fic fr-dib fr-bordered"></p><p><br></p>

This error code indicates the system is undergoing sub-cooling protection in Cooling/Dry mode.

P5 error code

Troubleshooting

Troubleshooting (Diamante Series)

Do I need to restart my unit manually after the power goes out?

How can I fix my indoor air handler when the unit is not turning On?

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What is the difference between 115V and 230V systems?

Electrical Related General Queries

Does the fan for my system shut Off in Cooling mode?

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How do I apply Pioneer Flare Leak Guard during installation?

Pioneer lineset diameter selection guide

What are the requirements for installing a mini split?

What type of oil is used for my unit?

Why did my ductless mini split system freeze on the inside air handler?

Are the linesets pre-flared when I buy a mini split?

Diagnosing and Preventing Crossed Wiring in Multi-Zone Systems

Sizing Systems & Short Cycling

What Refrigerants do Pioneer HVAC Systems Use?

HVAC Related General Queries

Can a wall-mounted indoor unit be set onto the ceiling instead?

Can I operate the indoor unit without a remote control?

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Indoor Unit

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Online Shopping

PT Chart (YN012ALUI17RPD)

PT Chart (YN012GLUI17RPD)

PT Chart (YN018GLUI17RPD)

PT Chart (YN024GLUI17RPD)

PT Chart (YN036GLUI17RPD)

PT (Pressure-Temperature) Charts - WYT-17

Diamante Essenza - High Wall Mount (WYT-17)

PT Chart (YN009ALSI20RPF)

PT Chart (YN009GLSI20RPF)

PT Chart (YN012ALSI20RPF)

PT Chart (YN012GLSI20RPF)

PT Chart (YN018GLSI20RPF)

PT Chart (YN024GLSI20RPF)

PT Chart (YN030GLSI20RPF & YN036GLSI20RPF)

PT (Pressure-Temperature) Charts - WYT-20

Diamante Pro - High Wall Mount (WYT-20)

PT Chart (YN009ALSI24RPG)

PT Chart (YN009GLSI24RPG)

PT Chart (YN012ALSI24RPG)

PT Chart (YN012GLSI24RPG)

PT Chart (YN018GLSI24RPG)

PT Chart (YN024GLSI24RPG)

PT (Pressure-Temperature) Charts - WYT-24

Quantum Ultra - High Wall Mount (WYT-24)

PT Chart (YN009GLSI25RPH)

PT Chart (YN012GLSI25RPH)

PT Chart (YN018GLSI25RPH)

PT Chart (YN024GLSI25RPH)

PT (Pressure-Temperature) Charts - WYT-25

Quantum Hyperformance - High Wall Mount (WYT-25)

PT Chart (YN012GLUI25RPQ)

PT (Pressure-Temperature) Charts - WYT-FA

Quantum Fresh - High Wall Mount (WYT-FA)

PT (Pressure-Temperature) Charts - CYT-24

Quantum Ultra - Ceiling Cassette (CYT-24)

PT (Pressure-Temperature) Charts - RYT-24

Quantum Ultra - Ceiling Concealed (RYT-24)

PT (Pressure-Temperature) Charts - UYT-24

Quantum Ultra - Floor-Ceiling Flex (UYT-24)

PT Chart (YN020GLSI24M2G)

PT Chart (YN030GLSI24M3G)

PT Chart (YN040GLSI24M4G)

PT Chart (YN050GLSI24M5G)

PT (Pressure-Temperature) Charts - YNL-24

Multi-Zone Quantum Ultra

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Pioneer Airlink App

Diamante Series Systems (WYT-19, WYT-22)

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Ducted Central Split DYR Series

NetHome Plus

RG10 Remote

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Discontinued Products

Products

CL error code

E0 error code

E1 or E2 error codes

E3, E7, or E8 error codes

E6 error code

E4 error code

E9 error code (Diamante Series)

E9 error code (Quantum Series)

EF error code

EU error code

F4 error code

F5 error code

PA error code (Multi-Zone Quantum Ultra Systems)

F6 error code

F7 error code

F8 error code

Fd error code

Fy error code

P0 error code

P1 error code

P2 error code

P4 error code

P6 error code

P7 error code

P8 error code

P9 error code

E9/P0 error codes

Indoor unit displaying 0A code

Troubleshooting (WYT-19 & WYT-22)

E1/EL 01/EL01 error codes

E3/EH 03/F5/EC 07 error codes

EC/EL 0C error codes

F4/EC51 error codes

LCAC error codes

P0/PC00 error codes

P1/PC01 error codes

P2/PC02 error codes

PC 03/PC03 error codes

P4/PC 04/PC04 error codes

Troubleshooting (WYS, CYB, RYB, UYB, & FYB)

Troubleshooting (Discontinued Products)

Introduction

Troubleshooting Diagram

P5 error codeUpdated an hour ago

Introduction

Troubleshooting

Troubleshooting Diagram