This error code indicates a communication failure between the indoor and outdoor units.

<h2 id="introduction"><u>Introduction</u></h2><p>The &quot;E0&quot; error code indicates an indoor unit and outdoor unit communication failure. The error code is for Diamante series systems.</p><h2 id="troubleshooting-diagram"><u>Troubleshooting Diagram</u></h2><p><img src="https://attachments.gorgias.help/Q9r0k7BYaV2vg13y/hc/9JWjXVxG8m6DvMqm/2025111315-cc08e081-a390-44e4-8013-19c80a2a7a03-wyt17_e0_troubleshooting.png" style="width: 1000px;" class="fr-fic fr-dib fr-bordered"></p>

E0 error code

These error codes indicate an indoor room temperature sensor failure or coil temperature sensor failure.

<h2 id="introduction"><u>Introduction</u></h2><p>The &quot;E1&quot; or &quot;E2&quot; error codes indicate an indoor room temperature sensor failure or coil temperature sensor failure. These error codes are for Diamante series systems.&#xA0;</p><h2 id="troubleshooting-diagram"><u>Troubleshooting Diagram</u></h2><p><img src="https://attachments.gorgias.help/Q9r0k7BYaV2vg13y/hc/9JWjXVxG8m6DvMqm/2025111317-0da63e7e-1035-439b-98b5-cc74a340c524-wyt17_e1_e2_troubleshooting.png" style="width: 1000px;" class="fr-fic fr-dib fr-bordered"></p><p><br></p>

E1 or E2 error codes

These error codes indicate an outdoor unit coil temperature sensor failure, ambient temperature sensor failure, or discharge temperature sensor failure.

<h2 id="introduction"><u>Introduction</u></h2><p>The &quot;E3&quot;, &quot;E7&quot;, or &quot;E8&quot; error codes indicate an outdoor unit coil temperature sensor failure, ambient temperature sensor failure, or discharge temperature sensor failure.&#xA0;</p><p>The &quot;E3&quot; error code indicates an outdoor unit coil temperature sensor failure. The &quot;E7&quot; error code indicates an outdoor unit ambient temperature sensor failure. The &quot;E8&quot; error code indicates an outdoor unit discharge temperature sensor failure.&#xA0;</p><p>These error codes are for Diamante series systems.&#xA0;</p><h2 id="troubleshooting"><u>Troubleshooting</u></h2><p>If any of the sensors experience a short circuit or an open circuit fault, the system will display the error codes. After the error codes display, the indoor and outdoor units turn off. When the sensors recover, the unit reverts to standby. The unit can then be turned on directly.&#xA0;</p><h2 id="troubleshooting-diagram"><u>Troubleshooting Diagram</u><u><img src="https://attachments.gorgias.help/Q9r0k7BYaV2vg13y/hc/9JWjXVxG8m6DvMqm/2025111317-c940dcd3-843d-4e42-a768-967e197c18c3-wyt17_e3_e7_e8_troubleshooting.png" style="width: 1000px;" class="fr-fic fr-dib fr-bordered"></u></h2>

E3, E7, or E8 error codes

This error code indicates the AC cooling system is operating abnormally.

<h2 id="introduction"><u>Introduction</u></h2><p>The &quot;E4&quot; error code indicates the AC cooling system is operating abnormally. This error may occur if the system does not have enough gas. The error code is for Diamante series systems.&#xA0;</p><h2 id="troubleshooting-diagram"><u>Troubleshooting Diagram</u><u><img src="https://attachments.gorgias.help/Q9r0k7BYaV2vg13y/hc/9JWjXVxG8m6DvMqm/2025111317-5ae826a5-d6e8-462c-956b-627c276f3371-wyt17_e4_troubleshooting.png" style="width: 1000px;" class="fr-fic fr-dib fr-bordered"></u></h2>

E4 error code

This error code indicates the indoor unit's PG fan motor or DC fan motor is operating abnormally, causing indoor unit ventilation failure.

<h2 id="introduction"><u>Introduction</u></h2><p>The &quot;E6&quot; error code indicates the indoor unit&apos;s PG fan motor or DC fan motor is operating abnormally, causing indoor unit ventilation failure. The error code is for Diamante series systems.</p><h2 id="troubleshooting-diagram"><u>Troubleshooting Diagram</u><u><img src="https://attachments.gorgias.help/Q9r0k7BYaV2vg13y/hc/9JWjXVxG8m6DvMqm/2025111317-d2d846b9-238d-4ce3-8333-77e0f5fcdcd7-wyt17_e6_troubleshooting.png" style="width: 1000px;" class="fr-fic fr-dib fr-bordered"></u><br></h2>

E6 error code

This error code indicates the Intelligent Power Module (IPM) or compressor driving control is operating abnormally.

<h2 id="introduction"><u>Introduction</u></h2><p>The &quot;E9&quot; error code indicates the Intelligent Power Module (IPM) or compressor driving control is operating abnormally. The error code is for Diamante series systems.&#xA0;</p><h2 id="troubleshooting"><u>Troubleshooting</u></h2><p>If the unit stops operating for IPM protection six times consecutively, it will display the error code. The unit can&apos;t be recovered for operation, except by pressing the On/Off button.&#xA0;</p><h2 id="troubleshooting-diagram"><u>Troubleshooting Diagram</u><u><img src="https://attachments.gorgias.help/Q9r0k7BYaV2vg13y/hc/9JWjXVxG8m6DvMqm/2025111317-63307fc6-b267-43c2-ae13-4f1af2d9e222-wyt17_e9_troubleshooting.png" style="width: 1000px;" class="fr-fic fr-dib fr-bordered"></u></h2>

E9 error code

This error code indicates the outdoor unit's DC fan motor has failed.

<h2 id="introduction"><u>Introduction</u></h2><p>The &quot;EF&quot; error code indicates the outdoor unit&apos;s DC fan motor has experienced a fault. The error code is for Diamante series systems.&#xA0;</p><h2 id="troubleshooting-diagram"><u>Troubleshooting Diagram</u><u><img src="https://attachments.gorgias.help/Q9r0k7BYaV2vg13y/hc/9JWjXVxG8m6DvMqm/2025111317-29ab0254-132f-4aa8-95e4-d3af3c8ea96f-wyt17_ef_troubleshooting.png" style="width: 1000px;" class="fr-fic fr-dib fr-bordered"></u></h2>

EF error code

This error code indicates outdoor unit voltage test sensor failure.

<h2 id="introduction"><u>Introduction</u></h2><p>The &quot;EU&quot; error code indicates the outdoor unit&apos;s voltage test sensor has experienced a fault. The error code is for Diamante series systems.&#xA0;</p><h2 id="troubleshooting"><u>Troubleshooting</u></h2><p>After the power relay operates, if the tested effective voltage is less than 50v for 3 seconds continuously, the unit will display the error code.&#xA0;</p><h2 id="troubleshooting-diagram"><u>Troubleshooting Diagram</u><u><img src="https://attachments.gorgias.help/Q9r0k7BYaV2vg13y/hc/9JWjXVxG8m6DvMqm/2025111318-5a55541a-5bd6-4c98-98c7-f8c4175356d0-wyt17_eu_troubleshooting.png" style="width: 1000px;" class="fr-fic fr-dib fr-bordered"></u></h2><h2 id><br></h2>

EU error code

This error code indicates the system detects refrigerant leakage.

<div data-block="true" data-editor="645tt" data-offset-key="81k9b-0-0" id="isPasted" style="box-sizing: border-box; -webkit-font-smoothing: antialiased; color: rgb(27, 28, 29); font-family: Inter, &quot;Helvetica Neue&quot;, Arial, Helvetica, sans-serif; font-size: 14px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: pre-wrap; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;"><h2 id="isPasted"><u>Introduction</u></h2><p>The &quot;FY&quot; error code indicates the system detects refrigerant leakage. The error code is for Diamante Series systems.</p><h2 id="isPasted"><u>Troubleshooting</u></h2><p><strong>Note</strong>: An HVAC professional may be required for assistance.</p><h3 id="the-troubleshooting-recommendations-for-new-or-recently-installed-units-include"><span style="font-size: 16px;">The troubleshooting recommendations for new or recently installed units include:</span></h3><ul type="disc"><li style="font-size: 16px;">Open the valves on the outdoor unit fully. The valves release the refrigerant from the outdoor unit into the circuit.</li><li style="font-size: 16px;">Ensure the length of the piping used for the indoor unit does not exceed the pre-charge refrigerant length. (25 ft. pre-charge per zone)</li><li style="font-size: 16px;">Inspect the&#xA0;unit for a potential leak. Check the following:<ul type="circle" style="font-size: initial;"><li style="font-size: 16px;">Oil stains or residue around the unit&#x2019;s fittings and connections.</li><li style="font-size: 16px;">Hissing or bubbling sounds near the unit when it&#x2019;s running.</li><li style="font-size: 16px;">Reduced cooling or heating performance.</li></ul></li><li style="font-size: 16px;">Check the pressure PSI for the unit and verify it&#x2019;s within the appropriate range. Use compatible gauges while the system is on and running to check the pressure PSI. You can force the compressor to turn on using the manual button on the indoor unit. <strong>Note</strong>: Use the Refrigerant Pressure-Temperature chart for reference when checking the pressure PSI. <a href="https://www.pdhvac.com/site/downloads/Temperature-Pressure-Chart.pdf" target="_blank">Refrigerant Pressure-Temperature chart</a><span data-offset-key="54hi0-0-0"><img src="https://attachments.gorgias.help/Q9r0k7BYaV2vg13y/hc/9JWjXVxG8m6DvMqm/2025053013-2d75861f-4743-4c6c-98e6-695da5cefc82-manual_button_diamante_series.png" style="width: 300px;" class="fr-fic fr-dib"></span></li></ul><h3 id="the-troubleshooting-recommendations-for-units-include"><span style="font-size: 16px;">The troubleshooting recommendations for units include:</span></h3><ul><li style="font-size: 16px;">Check the pipe connection for any gas leakage.&#xA0;<ul style="font-size: initial;"><li style="font-size: 16px;">If there is a gas leakage, repair and charge new gas as spec.&#xA0;</li><li style="font-size: 16px;">If there is not gas leakage, check the room and evaporator coil temperature.&#xA0;</li></ul></li><li style="font-size: 16px;">Repair and charge new gas as spec.<ul style="font-size: initial;"><li style="font-size: 16px;">If the error continues, replace the indoor Printed Circuit Board (PCB).&#xA0;</li></ul></li><li style="font-size: 16px;">Check the room and evaporator coil temperature. Determine if the temperature difference is more than 2&#xB0;C (35.6&#xB0;F) btw RT and IPT after starting the unit.&#xA0;<ul style="font-size: initial;"><li style="font-size: 16px;">If yes, check if the sensor is connected to the PCB.&#xA0;</li><li style="font-size: 16px;">If no, check if there are any obstructions in the evaporator pipe.&#xA0;</li></ul></li><li style="font-size: 16px;">Confirm the sensor is connected to the PCB.&#xA0;<ul style="font-size: initial;"><li style="font-size: 16px;">If yes, check if the sensor is short circuited.&#xA0;</li><li style="font-size: 16px;">If no, reconnect the sensor to the PCB.&#xA0;</li></ul></li><li style="font-size: 16px;">Check if the sensor short circuited. Replace the sensor if it short circuited.&#xA0;</li><li style="font-size: 16px;">Check if there are any obstructions in the evaporator pipe.<ul style="font-size: initial;"><li style="font-size: 16px;">If yes, replace the evaporator.</li><li style="font-size: 16px;">If not, replace the indoor PCB.</li></ul></li></ul><p><strong>Note</strong>: Contact our Parts and Warranty department for any replacement components. Call 1-800-919-0150; Option #4.</p><h2 id="isPasted"><u>Methods for Checking Leaks</u></h2><p><span style="font-size: 16px;">The following are recommended methods for checking leaks:</span></p><ul type="disc"><li style="font-size: 16px;">Check for leaks by combining water with a small amount of dish soap or liquid detergent. Apply the soapy water solution to the fittings, connections, and tubing of the indoor and outdoor units while the mini-split is turned on. The particular spot where the bubbles form indicates the location of the refrigerant leak.</li><li style="font-size: 16px;">Leak detector tools can detect refrigerant leaks through electronic sensors along the piping and around the unit coils.</li><li style="font-size: 16px;">Nitrogen pressure testing is commonly used by leak detection techs.</li></ul><h2 id="troubleshooting-diagram"><u>Troubleshooting Diagram</u></h2></div><div style="box-sizing: border-box; -webkit-font-smoothing: antialiased; color: rgb(27, 28, 29); font-family: Inter, &quot;Helvetica Neue&quot;, Arial, Helvetica, sans-serif; font-size: 14px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: pre-wrap; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;"><img src="https://attachments.gorgias.help/Q9r0k7BYaV2vg13y/hc/9JWjXVxG8m6DvMqm/2025111315-01d73456-9681-4bb7-aec0-2e8e34b00ae7-wyt17_fy_troubleshooting.png" style="width: 1000px;" class="fr-fic fr-dib fr-bordered"></div><div data-block="true" data-editor="645tt" data-offset-key="dcokr-0-0" style="box-sizing: border-box; -webkit-font-smoothing: antialiased; color: rgb(27, 28, 29); font-family: Inter, &quot;Helvetica Neue&quot;, Arial, Helvetica, sans-serif; font-size: 14px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: pre-wrap; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;"><br></div>

FY error code

This error code indicates the Intelligent Power Module (IPM) is undergoing protection.

<h2 id="introduction"><u>Introduction</u></h2><p>The &quot;P0&quot; error code indicates the Intelligent Power Module (IPM) is undergoing protection. The error code is for Diamante series systems.&#xA0;</p><h2 id="troubleshooting"><u>Troubleshooting</u></h2><p>If the IPM is experiencing overheating or overcurrent conditions, the unit will display the error code.&#xA0;</p><h2 id="troubleshooting-diagram"><u>Troubleshooting Diagram</u><u><img src="https://attachments.gorgias.help/Q9r0k7BYaV2vg13y/hc/9JWjXVxG8m6DvMqm/2025111318-9b228522-0eb8-425b-aae5-543f123eb8e6-wyt17_p0_troubleshooting.png" style="width: 1000px;" class="fr-fic fr-dib fr-bordered"></u><br></h2><h2 id><br></h2><h2 id="-1"><br></h2>

P0 error code

This error code indicates the system is undergoing over-voltage or under-voltage protection.

<h2 id="introduction"><u>Introduction</u></h2><p>The &quot;P1&quot; error code indicates the system is undergoing over-voltage or under-voltage protection. The error code is for Diamante series systems.&#xA0;</p><h2 id="troubleshooting"><u>Troubleshooting</u></h2><p>1. Test voltage between L and N: When the power supply is V &gt; AC260V or V &lt; AC150V, the unit will display the error code. The unit will recover back to the previous state when the power supply is V &gt; AC155V.&#xA0;</p><p>2. Test voltage on the big size electrolytic capacitor of the outdoor unit&apos;s printed circuit board (PCB): When the DC busbar voltage is V &gt; DC420V or V &lt; DC150V, the unit will display the error code. The unit will recover back to the previous state when the DC busbar voltage is DC190V &lt; V &lt; DC410V.&#xA0;</p><h2 id="troubleshooting-1"><u>Troubleshooting</u><u><img src="https://attachments.gorgias.help/Q9r0k7BYaV2vg13y/hc/9JWjXVxG8m6DvMqm/2025111318-f674f2cf-3240-4a5f-a17f-6a34dd6aa130-wyt17_p1_troubleshooting.png" style="width: 1000px;" class="fr-fic fr-dib fr-bordered"></u></h2>

P1 error code

This error code indicates the system is undergoing over-current protection.

<h2 id="introduction"><u>Introduction</u></h2><p>The &quot;P2&quot; error code indicates the system is undergoing over-current protection. The error code is for Diamante series systems.&#xA0;</p><h2 id="troubleshooting"><u>Troubleshooting</u></h2><p>When the unit&apos;s running current is more than maximum current (Imax), the unit will stop and display the error code.</p><p><strong>Note:</strong> For different models, the lmax has different values. &#xA0;</p><h2 id="troubleshooting-diagram"><u>Troubleshooting Diagram</u><u><img src="https://attachments.gorgias.help/Q9r0k7BYaV2vg13y/hc/9JWjXVxG8m6DvMqm/2025111318-54a7e203-150d-456c-b055-390698153449-wyt17_p2_troubleshooting.png" style="width: 1000px;" class="fr-fic fr-dib fr-bordered"></u></h2>

P2 error code

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Did your Diamante series system display an error code? Learn how to resolve the error code by using these troubleshooting guides. 

Understand and resolve errors for Diamante series systems

Troubleshooting

Use these troubleshooting guides to resolve errors for Diamante series systems.

Troubleshooting (Diamante Series)

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How do I determine which breaker size and wire is needed for my system?

How does my system receive power?

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

Electrical Related General Queries

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Pioneer lineset diameter selection guide

What are the requirements for installing a mini split?

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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