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The &quot;EC07&quot;, &quot;EH03&quot;, &quot;EH31&quot;, or &quot;EH32&quot; error codes indicate an abnormal fan speed.&#xA0;<ul><li style="font-size: 16px;">EC07 Error Code: An abnormal outdoor unit fan speed.&#xA0;</li><li style="font-size: 16px;">EH03 Error Code: An abnormal indoor unit fan speed.&#xA0;</li><li style="font-size: 16px;">EH31 and EH32 Error Codes: An indoor unit fan speed error.&#xA0;</li></ul>If the indoor or outdoor fan speed stays too low or too high for a set period, the system stops operating and an error code appears on the LED display.&#xA0;Recommended Parts to Prepare<ul><li style="font-size: 16px;">Connection wires</li><li style="font-size: 16px;">Fan assembly</li><li style="font-size: 16px;">Fan motor</li><li style="font-size: 16px;">PCB</li></ul><img src="https://attachments.gorgias.help/Q9r0k7BYaV2vg13y/hc/9JWjXVxG8m6DvMqm/2026101320-76a27e4a-01b0-4bf1-8613-9edf5770f60b-ec07_eh03_eh31_eh32_code.png" style="width: 600px;" class="fr-fic fr-dib fr-bordered">

These error codes indicate an abnormal fan speed.

EC07, EH03, EH31, and EH32 Error Codes

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Diamante & Quantum Systems

Light-Commercial HVAC Systems

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Pioneer Offers Hyper-Heat Units

Pioneer Systems Offer Both Heating & Cooling Functions

Understanding the Difference Between 115V & 230V Systems

Understanding the Refrigerants Used for Each Model

How to Choose a System

Does Pioneer Offer Pre-Charged Linesets?

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How Mini-Splits Are Powered

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Pioneer Mini-Splits Function as Dehumidifiers

Pioneer Offers Various Lineset Lengths

Pioneer Systems Feature Factory Pre-Charged Refrigerant

Running a Mini-Split Below Its Total Zone Capacity

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

Understanding the Allowable Zone Combinations for Multi-Zone Systems

Understanding the Life Expectancy of Pioneer Systems

Mini-Split Basics

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Diamante Essenza High-Wall (WYT-17) Overview

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Vertex Ducted Central Split (DYC-18) Overview

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ECOasis 50 Ductless Wall-Mounted Single-Room Energy Recovery Ventilator (ERV) Overview

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QHD070 Whole-House Ducted Dehumidifier (QHD) Overview

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Conducting Test Runs

Connecting the Refrigerant Piping

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Evacuating the Refrigerant Circuit

Selecting the Correct Standard Wire Gauge for Connections

Understanding the Differences Between a 6-Foot Plastic Whip & a 4-Lead Wire

Understanding the Ideal Mounting Height for Indoor Units

Understanding Refrigerant Lineset Installation

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Ceiling Cassettes

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Ducted Central Split

Floor/Ceiling/Low-Wall Flex Consoles

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Wall-Mounted Units

Indoor Units

Installing Outdoor Units: Getting Started

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Mounting the Outdoor Unit

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Outdoor Units

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Energy Recovery Ventilator

Connecting the Drain Fitting for QHD070 Whole-House Ducted Dehumidifiers

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Understand the DIP Switches for Vertex Ducted Central Split Systems

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Clean the Filters for 4-Way & 8-Way Ceiling Cassette Systems

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Filter Cleaning & CL Code

Activate Auto Mode

Activate the Child-Lock Function

Activate Cooling Mode

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Activate Fan-Only Mode

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Activate 46°F Freeze Protection

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QHD070 Whole-House Dehumidifiers

Activate Dehumidification Mode

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Activate Ventilation Mode

Rooftop RV Systems

Under-Bench RV Systems

Activate the Accelerated Cooling/Heating Function

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Understand the Compressor Crankshaft Heater Control Function

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Understand the Indoor Coil Anti-Freezing Function

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Vertex Ducted Central Split Systems

Functions & Modes Explained

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Diagnose & Prevent Crossed Wiring in Multi-Zone Systems

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EC07, EH03, EH31, and EH32 Error CodesUpdated 2 hours ago