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<p><strong>PA Error Code: Top Flow Unit Communication Failure or Preset Mode Conflict</strong></p><h2 id="causes"><u>Causes</u></h2><ol><li style="font-size: 16px;">If the first indoor unit to turn on operates in Cooling or Dehumidification mode, the other indoor units can operate only in Cooling, Dehumidification, or Air Supply mode. An indoor unit set to any other mode reports a mode conflict fault and does not start. This fault does not affect indoor units that are already running.</li><li style="font-size: 16px;">If the first indoor unit to turn on operates in Heating mode, the other indoor units can operate only in Heating mode. An indoor unit set to any other mode reports a mode conflict fault and does not start. This fault does not affect indoor units that are already running.</li></ol><h2 id="solution"><u>Solution</u></h2><p>Set all the indoor units to the same mode.&#xA0;</p><h2 id="note"><u>Note</u></h2><p>Avoid running the units on Auto mode, as it could cause this error.</p>

This error code indicates a mode conflict for Quantum multi-zone systems.

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Multi-Zone Systems

Pioneer Offers Hyper-Heat Units

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Running a Mini-Split Below Its Total Zone Capacity

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

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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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QHD070 Whole-House Ducted Dehumidifier (QHD) Overview

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Filter Cleaning & CL Code

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 for Quantum Fresh High-Wall Systems

Activate Gentle Wind Mode for Quantum Fresh High-Wall Systems

Activate Heating Mode

Activate the I Feel Feature

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Activate Turbo Mode

Activate 46°F Freeze Protection

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Diamante & Quantum Systems

Understand the Defrost Function

Understand the Dehumidification Function

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QHD070 Whole-House Dehumidifiers

Activate Dehumidification Mode

Activate Night Mode

Activate Ventilation Mode

Rooftop RV Systems

Under-Bench RV Systems

Activate the Accelerated Cooling/Heating Function

Understand the Anti-Cold Air Function

Understand the Compressor Crankshaft Heater Control Function

Understand the Heating Fan Delay Function

Understand the Indoor Coil Anti-Freezing Function

Understand the Passive Dehumidification Function

Understand the Refrigerant Leak Detection Function

Vertex Ducted Central Split Systems

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Diagnose & Prevent Crossed Wiring in Multi-Zone Systems

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PA Error CodeUpdated an hour ago

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