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Honeywell suggests the following steps, which we have supplemented and photo-illustrated for clarity and safety. Check the test specifications provided by the manufacturer of your particular control. This example is based on advice from the Honeywell Tradeline L4064B. Here, extrapolating from that guidance and adding some field experience, we provide more detailed step by step procedures for troubleshooting and testing the heating furnace fan limit control switch. Plenum temperature has reached fan-on setting.

Recconnect the fan switch, turn on power and again set Limit controller should shut burner off when plenum When installation of a fan-limit switch is complete, Honeywell provides a very simple fan limit switch checkout procedure to be used after the switch is installed: Step by Step Photo Guide to Testing the Warm Air Furnace Combination Control- Fan Limit Switch Fan Limit Swith Checkout Procedure We also provide an ARTICLE INDEX for this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need. The photo at the top of this page shows all of the controls and wiring terminals in a Honeywell combination fan and limit control type L4064B. We also discuss the diagnosis & repair of common furnace operating troubles such as a blower assembly fan that runs continuously - it may be a simple switch setting. As a working example we examine the Honeywell combination fan and limit control type L4064B. This article describes in detail the testing and diagnosis of problems with warm air heating furnace combination controls, also commonly called the "fan limit switch" on warm air heating systems. Guide to troubleshooting heating system furnace controls, limit controls, and fan controls. We have no relationship with advertisers, products, or services discussed at this website.įan limit switch troubleshooting diagnosis & repair:Ĭheck this fan limit switch control if your furnace fan won't start (won't turn on) or won't stop (runs continuously). InspectAPedia tolerates no conflicts of interest.