---
description: Download spec sheets, manuals and brochures. International product and discontinued product spec sheets are also available for download.
title: Diagnostic Guides
image: https://www.questclimate.com/wp-content/uploads/2023/06/Quest-100_Digital-Controls.jpg
---

# Diagnostic Guides

#### Quest 70

* [Quest 70 Troubleshooting](https://www.questclimate.com/wp-content/uploads/2024/10/Troubleshooting-steps-Quest-70%5Fweb.pdf)
* [Adjusting compressor vibration noise on Quest 70](https://www.questclimate.com/wp-content/uploads/2024/10/adjusting%5Fcompressor%5Fvibration%5Fnoise%5Fquest%5F70%5Fweb.pdf)

#### Quest 100

* [Quest 100 Diagnostics](https://www.questclimate.com/wp-content/uploads/2024/10/Quest-100-Diagnostics%5Fweb-1.pdf)

#### Quest 335

* [Quest 335 Diagnostics](https://www.questclimate.com/wp-content/uploads/2024/10/Quest-335-Diagnostics-web.pdf)
* [Quest 335 Diagnostics Chinese](https://www.questclimate.com/wp-content/uploads/2024/10/Quest-335-Diagnostics-Chinese-web.pdf)
* [Quest 335 Coil Probe Location](https://www.questclimate.com/wp-content/uploads/2024/10/Quest-335-Coil-Probe-Location%5Fweb.pdf)

#### Quest 506

* [Quest 506 Diagnostics](https://www.questclimate.com/wp-content/uploads/2024/10/Quest-506-Diagnostics%5Fweb.pdf)
* [506 Foot Removal](https://www.questclimate.com/wp-content/uploads/2024/10/506-Foot-Removal%5Fweb.pdf)
* [How to replace the impeller fan on a Quest 506](https://www.questclimate.com/wp-content/uploads/2024/10/How-to-replace-the-impeller-fan-on-a-Quest-506-dehumidifier%5Fweb.pdf)
* [Quest 506 Fan Capacitor Retrofit](https://www.questclimate.com/wp-content/uploads/2024/10/Quest-506-Fan-Capacitor-Retrofit%5Fweb.pdf)
* [Quest 506 Fan Relay Upgrade](https://www.questclimate.com/wp-content/uploads/2024/10/Quest-506-Fan-Relay-Upgrade%5Fweb.pdf)
* [Quest 506 Fan Whistle Noise Repair](https://www.questclimate.com/wp-content/uploads/2024/10/Quest-506-Fan-Whistle-Noise-Repair%5Fweb.pdf)
* [Quest 506 208/230v (R454B) Function Check](https://www.questclimate.com/wp-content/uploads/2025/06/Quest-506-208%5F230v-R454B-Function-Check.pdf)

#### Quest 706

* [Quest 706 How to reset stored Alarms on a Carel PLC](https://www.questclimate.com/wp-content/uploads/2024/10/How-to-reset-stored-Alarms-on-a-Carel-PLC-Quest-706%5Fweb.pdf)
* [Quest 706 Induced Voltage Control Issue](https://www.questclimate.com/wp-content/uploads/2024/10/Induced-Voltage-Control-Issue-Quest-706%5Fweb.pdf)
* [Change PLC Mininimum Run Time Quest 876 / 746 / 706](https://www.questclimate.com/wp-content/uploads/2026/03/PLC-Minimum-Run-Time-Change-746-876-706.pdf)

#### Quest 746

* [Quest 746 Diagnostics](https://www.questclimate.com/wp-content/uploads/2024/10/Quest-746-Diagnostics-web.pdf)
* [Change PLC Minimum Run Time Quest 876/ 746 (1st gen)/ 706](https://www.questclimate.com/wp-content/uploads/2026/03/PLC-Minimum-Run-Time-Change-746-876-706.pdf)

#### Quest 876

* [Quest 876 Diagnostics](https://www.questclimate.com/wp-content/uploads/2024/10/Quest-876-Diagnostics-web.pdf)
* [Daisy Chain TrolMaster to Quest 506 / 876](https://www.questclimate.com/wp-content/uploads/2024/10/Daisy-Chain-TrolMaster-to-Quest-506-876%5Fweb.pdf)
* [Quest 876 Defrost Sensing Circuit](https://www.questclimate.com/wp-content/uploads/2024/10/Quest-876-Defrost-Sensing-Circuit%5Fweb.pdf)
* [Quest 876 Transducer Leak Check](https://www.questclimate.com/wp-content/uploads/2024/10/Quest-876-Transducer-Leak-Check%5Fweb.pdf)
* [Change PLC Mininimum Run Time Quest 876 / 746 / 706](https://www.questclimate.com/wp-content/uploads/2026/03/PLC-Minimum-Run-Time-Change-746-876-706.pdf)

#### Quest DUAL 105, 155, 165, 205, 215, 225

* [XT Troubleshooting](https://www.questclimate.com/wp-content/uploads/2024/10/XT-Troubleshooting%5Fweb.pdf)
* [XT Defrost Overload Bypass Testing Procedure](https://www.questclimate.com/wp-content/uploads/2024/10/XT-Defrost-Overload-Bypass-Testing-Procedure%5Fweb.pdf)
* [XT Defrost Overload Bypass Test (Chinese)](https://www.questclimate.com/wp-content/uploads/2024/10/XT-Defrost-Overload-Bypass-Testing-Chinese%5Fweb.pdf)
* [XT Isolation Rewire Instructions](https://www.questclimate.com/wp-content/uploads/2024/10/XT-isolation-relay-rewire-instructions%5Fweb.pdf)
* [XT Platform Defrost Upgrade](https://www.questclimate.com/wp-content/uploads/2024/10/XT-Platform-Defrost-Upgrade%5Fweb.pdf)
* [XT Platform Ebox assemblies](https://www.questclimate.com/wp-content/uploads/2024/10/Ebox-assemblies-XT-platform%5Fweb.pdf)
* [Replacing fan capacitor on Dual 225](https://www.questclimate.com/wp-content/uploads/2024/10/Replacing-fan-capacitor-on-Dual-225%5Fweb.pdf)
* [Replacing Fan Capacitor on Dual 225 (Chinese)](https://www.questclimate.com/wp-content/uploads/2024/10/Quest-Dual-225-Fan-capacitor-upgrade-Chinese%5Fweb.pdf)
* [Replacing impeller fan on XT platform](https://www.questclimate.com/wp-content/uploads/2024/10/Replacing-impeller-fan-on-XT-platform-dehumidifier%5Fweb.pdf)

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