This article explains why your appliance may not be operating or responding.

<h2 id="introduction"><u>Introduction</u></h2><p>This article explains why your appliance may not be operating or responding.&#xA0;</p><h2 id="possible-causes"><u>Possible Causes</u></h2><ul><li>Power failure.&#xA0;</li><li>The plug is pulled out or tripped.&#xA0;</li><li>The wrong wiring and breaker is being used.&#xA0;</li><li>The fan motor of the indoor or outdoor unit is damaged.&#xA0;</li><li>There is a faulty compressor or thermomagnetic circuit breaker.&#xA0;</li><li>There is a faulty protective device or fuses.&#xA0;</li><li>The electrical connections are loose.&#xA0;</li><li>The system has entered a protection mode.&#xA0;</li><li>The system has entered an overvoltage or undervoltage protection.&#xA0;</li><li>The Timer-On function is active.&#xA0;</li><li>The electronic control board was damaged.&#xA0;</li><li>The remote controller may not be close enough to the indoor unit.&#xA0;</li><li>The batteries of the remote controller may need to be replaced.&#xA0;</li><li>There are obstacles between the remote controller and indoor unit signal receiver.&#xA0;</li></ul>

Find Out Why the Appliance is Not Operating or Responding

This article explains why the LED display for your system is off.

<h2 id="introduction"><u>Introduction</u></h2><p>This article explains why the LED display for your system is off.&#xA0;</p><h2 id="possible-causes"><u>Possible Causes</u></h2><ul><li>The Display button has been pressed, causing the system to turn off.&#xA0;</li><li>There has been a power failure.&#xA0;</li></ul>

Find Out Why Your LED Display is Off

This article explains why your system's insufficient, and the air is not hot or cold enough.

<h2 id="introduction"><u>Introduction</u></h2><p>This article explains why your system&apos;s insufficient, and the air is not hot or cold enough.&#xA0;</p><h2 id="possible-causes"><u>Possible Causes</u></h2><ul><li>The temperature setting is unsuitable.&#xA0;</li><li>The air conditioner takes and outlets may be obstructed.&#xA0;</li><li>The air filter may be dirty.&#xA0;</li><li>The fan speed may be set at the minimum.&#xA0;</li><li>There may be too many other heat sources in the room.&#xA0;</li><li>The system may be getting low on refrigerant. Pressures should be checked.&#xA0;</li></ul>

Find Out Why Your System's Airflow is Insufficient

This article provides a solution for pressure readings that do not rise when releasing refrigerant during leak checks.

<h2 id="introduction"><u>Introduction</u></h2><p>This article provides a solution for pressure readings that do not rise when releasing refrigerant during leak checks.</p><h2 id="solution"><u>Solution</u></h2><p>Verify that the gauge tube pin on the manifold gauge is fully engaging the outdoor unit service port&apos;s Schrader valve. A pin that is over or underexposed will not allow the gauge to access the refrigerant circuit, preventing pressure measurement and/or proper vacuuming. The depressor pin inside the hose connector is adjustable for proper Schrader valve engagement.&#xA0;</p><p>A telltale sign that this is happening is whether the gauge reading goes to instant vacuum when the pump is first turned on. This means only the gauge is being vacuumed. If so, vacuuming will need to be re-performed, since only the gauge itself was vacuumed.&#xA0;</p>

Solution for Pressure Readings Not Rising When Releasing Refrigerant During Leak Checks

This article provides a solution for systems indicating that a refrigerant leak is present.

<h2 id="introduction"><u>Introduction</u></h2><p>This article provides a solution for systems indicating that a refrigerant leak is present.&#xA0;</p><h2 id="solution"><u>Solution</u></h2><p>Follow these steps to fix systems indicating that a refrigerant leak is present:&#xA0;</p><ol><li>Cut off the power to the system.&#xA0;</li><li>Prepare a soapy water spray and spray the connection points of the lineset. The point where the bubbles form is where the leak is located.&#xA0;</li><li>Tighten the connection.&#xA0;</li><li>Re-test the system.&#xA0;</li><li>After the leak is repaired, re-charge the system.&#xA0;</li></ol>

Solution for Systems Indicating that a Refrigerant Leak is Present

This article provides solutions to resolve problems where the indoor unit is not turning on.

<h2 id="introduction"><u>Introduction</u></h2><p>This article provides solutions to resolve problems where the indoor unit is not turning on.&#xA0;</p><h2 id="solutions"><u>Solutions</u></h2><ul><li>Try the Manual (Emergency) button on the indoor unit in order to rule out problems with the remote controller.&#xA0;</li><li>Verify that the wire order is equal between the indoor and outdoor units. The color order must match. Check for splices or damage on the control cable. To rule out variables, remove any accessorial items, such as UV lights or condensate pumps, until the problem is solved.&#xA0;</li><li>Solution for 230V Systems: Use a multimeter to check the AC voltage across terminals L1-L2 on the outdoor system. Touch one probe to L1, the other probe goes on L2. Do not measure each leg to ground. Verify whether the reading is between 208-253 VAC.&#xA0;<img src="https://attachments.gorgias.help/Q9r0k7BYaV2vg13y/hc/9JWjXVxG8m6DvMqm/2025120420-eec2e3f2-4208-4c44-997b-ef1b9ab8d40a-wyt17_ac_voltage_terminals.png" style="width: 300px;" class="fr-fic fr-dib fr-bordered"><ul><li>If the reading is between 208-253 VAC, measure whether the reading is the same across 2-3 on both the outdoor and indoor units. All readings must match. The system must receive a full 230V reading in order to function.&#xA0;</li><li>If the reading is 0 VAC, then the system is not receiving proper power from the power source. Some common reasons are:&#xA0;<ul><li>A fused disconnect is being used, but fuses are blown and not inserted properly.&#xA0;</li><li>The disconnect box bus-bar is in the Off position.&#xA0;</li><li>A double-pole breaker is not being used. Single or tandem breakers will not operate.&#xA0;</li></ul></li></ul></li></ul>

Solutions for the Indoor Unit Not Turning On

This article provides solutions for systems unable to hold a vacuum.

<h2 id="introduction"><u>Introduction</u></h2><p>This article provides solutions for systems unable to hold a vacuum.&#xA0;</p><h2 id="solutions"><u>Solutions</u></h2><ul><li>A leak in the gauge hoses is likely. Repair the leak and check the vacuum pump.&#xA0;</li><li>Check the connection points for proper contact and torque, then tighten if necessary.&#xA0;</li></ul>

Solutions for Systems Not Holding A Vacuum

Chat with one of our friendly reps to get help quick.

Something on your mind not found here? E-mail us.

We offer phone support if you don't want to type.

Support Center

Common Issues

Troubleshooting

By Symptom

Pioneer Offers Hyper-Heat Units

Pioneer Systems Offer Both Heating and Cooling Functions

Understand the Difference Between 115V and 230V Systems

Understand the Refrigerants Used for Each Model

How to Choose a System

Mini Splits are Capable of Using Fewer Indoor Units than the Outdoor Unit’s Zonal Capacity

Pioneer Mini Splits Function as Dehumidifiers

Pioneer Offers Different Lineset Lengths

Pioneer Offers Pre-Charged Linesets

Pioneer Offers Pre-Flared Linesets

Pioneer Systems Include Factory Pre-Charged Refrigerant

Single-Zone Mini Splits Cannot be Used with Multiple Indoor Units

Understand the Life Expectancy of Pioneer Systems

Mini-Split Basics

Determine the Unit Size Needed for Your Space

Match the Lineset Diameter to Your Pioneer Indoor Unit

Understand Why Short Cycling Occurs When Sizing Systems

Sizing & Efficiency Guide

Start Here

Understand the Differences Between Inverter+ and Inverter++ Systems

Understand the Differences Between the Wall-Mounted Ductless Mini Splits

Understand Which Units are Rated Energy-Star

Compare Models

Learn About the Discounts Available

Learn About the Energy-Star Tax Credits Available for Pioneer Systems

Learn More about IRA Tax Credits

Learn Why Your Pioneer Discount Code Only Says "SAMPLE"

Redeem Your Pioneer Rewards Points When Shopping Online

Understand How to Manage Multiple Credit Card Charges with Pioneer

Financing & Payment

Learn About Our Shipping and Delivery Details

Understand the Qualifications for Free Shipping

Order Status & Shipping

Diamante Essenza (WYT-17) Overview

Diamante Pro (WYT-20) Overview

Quantum Ultra High-Wall (WYT-24) Overview

Quantum Hyperformance (WYT-25) Overview

Quantum Fresh (WYT-FA) Overview

Quantum Ultra Ceiling Cassette (CYT-24) Overview

Quantum Ultra Ducted Ceiling Concealed (RYT-24) Overview

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

Vertex Ducted Central Split (DYC-18) Overview

Quantum Ultra - Multi-Zone Overview

Product Line Overviews

Find Out How to Complete Returns

Figure Out How to Start Your Return

Learn About Our Return Policy

Learn About Our Policy for Undeliverable or Refused Shipments

Understand How to Return an Item

Understand the Eligibility Requirements for Refunds

Understand Our Return Fees

Understand Our Return Process

Returns & Refunds

Shopping & Pre-Purchase

Open Ceiling and Install Hanging Hook for Quantum Ultra Ceiling Cassette (CYT-24) Systems

Select the Indoor Unit Installation Location for Quantum Ultra Ceiling Cassette (CYT-24) Systems

Set Up the Indoor Unit Condensate Piping Connections for Quantum Ultra Ceiling Cassette (CYT-24) systems

Suspend the Air Handler Unit for Quantum Ultra Ceiling Cassette (CYT-24) Systems

Understand the Additional Leakage Sensor for Quantum Ultra Ceiling Cassette (CYT-24) Systems

Understand the Air Duct Parameters for Auxiliary Duct Usage

Cassette Units

Select the Indoor Unit Installation Location for Quantum Ultra Ducted Ceiling Concealed Systems

Select the Indoor Unit Installation Location for Vertex Ducted Central Split Systems

Understand the Additional Leakage Sensor for Quantum Ultra Ducted Ceiling Concealed (RYT-24) Systems

Ducted Units

Find an Installer for Your System

Find Professionals to Install Your Pioneer System

Learn Who is Permitted to Install Your System

Understand if Our Systems can be Self-Installed

Understand the Cost and Time Spent on Installing Systems

First-Time Setup

Angle Linesets Upward

Complete the Safety Checks and Test Run

Connect the Drain Hose for LCAC Systems

Find Out if a Wall-Mounted Indoor Unit can be Set onto Ceilings

Find Out if the Indoor Unit Requires Anything Extra in Order to be Wall-Mounted

Find Out the Ideal Height for Mounting Indoor Units

Learn the Gauge of Wire Used for Ductless System Connections

Setup the Lineset to Exit from the Side of the Indoor Unit

Understand 6-Foot Plastic Whips and 4-Lead Mini Split Connection Wire

Understand the Drilling Details to Accommodate Drain and Refrigerant Lines

Understand the Requirements for Installing Your System

Understand the Torque Wrench Size for Installing Your System

Installation Requirements

Understand the Meaning of “Multi-Zone”

Multi-Zone Units

Air Evacuation and Bleeding the Circuit for Wall-Mounted Systems

Connect the Drain Hose for Wall-Mounted Systems

Connect the Fresh Air Pipe for Quantum Fresh Systems

Connect the Power/Signal Electrical Wiring for Wall-Mounted Systems

Connect the Refrigerant Piping to the Indoor Unit for Wall-Mounted Systems

Connect the Refrigerant Piping to the Outdoor Unit for Wall-Mounted Systems

Drill the Piping Wall Hole for Wall-Mounted Systems

Install the Indoor Unit Mounting Plate for Wall-Mounted Units

Mount the Indoor Unit for Wall-Mounted Systems

Mount the Outdoor Unit for Wall-Mounted Systems

Prepare the Refrigerant Piping of the Indoor Unit for Wall-Mounted Systems

Select the Indoor Unit Installation Location for Quantum Fresh Systems

Select the Indoor Unit Installation Location for Quantum Ultra Floor-Ceiling Flex Systems

Select the Indoor Unit Installation Location for Wall-Mounted Systems

Select the Outdoor Unit Installation Location for Wall-Mounted Systems

Set Up the Outdoor Unit Condensate Water Drainage for Wall-Mounted Systems

Understand the Additional Leakage Sensor for Wall-Mounted Systems

Understand the Additional Leakage Sensor for Quantum Ultra Floor-Ceiling Flex (UYT-24) Systems

Single-Zone Units

Installation & Setup

Front Panel Displays for Quantum Ultra Ceiling Cassette Systems

Front Panel Display for Quantum Ultra Floor-Ceiling Flex Systems

Front Panel Displays for Wall-Mounted Systems

Wired Display Board Layout for Quantum Ultra Ducted Ceiling Concealed Systems

Display Layouts

CL error code

Clean the Anti-Dust Filters for Diamante Essenza and Pro Systems

Clean the Anti-Dust Filters for Quantum Ultra High Wall-Mount and Hyperformance Systems

Clean the Anti-Dust Filters for Quantum Fresh Systems

Cleaning the Anti-Dust Filters for Quantum Ultra Ceiling Cassette Systems

Clean the Anti-Dust Filters for Quantum Ultra Ducted Ceiling Concealed Systems

Clean the Anti-Dust Filters for Quantum Ultra Floor-Ceiling Flex Systems

Filter Cleaning & CL Code

Determine the Breaker Size and Wire Needed for Your System

Diagnose and Prevent Crossed Wiring in Multi-Zone Systems

Understand How the System Receives Power

Understand if Restarting Your Unit Manually is Required After the Power Goes Out

Electrical Related Queries

Locate the Model or Serial Number for Your System

Turn Off the LED Display for the Indoor Unit

General Queries

Check the Resistance of a Pioneer Temperature Sensor

Find Out the Type of Oil Used for Our Units

Fix Your Indoor Air Handler When the Unit is Not Turning On

Understand How Cased A-Coils Interact with Furnaces and Other Heating Units

Understand if the System's Fan Shuts Off in Cooling Mode

HVAC Related Queries

Maintenance Tips

Activate Auto Mode

Activate the Child-Lock Function

Activate Cooling Mode

Activate Dry Mode

Activate Energy Saver (ECO) Mode

Activate Fan-Only Mode

Activate the Fresh Air Feature

Activate Gentle Wind Mode

Activate Heating Mode

Activate the I Feel feature

Activate the Memory Feature

Activate Mute Mode

Activate the Self-Clean Feature

Activate Sleep Mode

Activate the Timer On/Timer Off Function

Activate Turbo Mode

Activate 46°F Freeze Protection

Understand the Auto-Restart Feature

Understand the Voice Control Feature

Modes Explained

Turn the LED Display On or Off

Control the Airflow for Ceiling Cassette Systems

Control the Airflow for Ducted Ceiling Concealed Systems

Control the Airflow for Floor-Ceiling Flex Systems

Control the Airflow for High Wall-Mounted Systems

Control System Airflow

Operating Instructions

Activate Heat Mode Using Diamante Pro Series Remotes

Replace Batteries for Remote Controls

Use the Emergency Manual Button to Operate the Indoor Unit Without a Remote Control