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TROUBLESHOOTING GUIDE - FLOW CHART Manual Gas Shut-off Upstream of Furnace/Drip Leg located on blower door or Figure 14, and the troubleshooting. Our comprehensive Heil furnace repair guide will explain common issues, provide troubleshooting tips, and show you how to read your model's error codes. Heil NUGS Pdf User Manuals. View online or download Heil NUGS Service Manual. Condensing Gas Furnace Troubleshooting Chart. Manual Gas Shut-off Upstream of Furnace/Drip Leg. Gas Valve turned ON? Type of Gas: troubleshooting assistance when R thermostat lead is disconnected.What are the most common problems for your Heil furnace? · The furnace won't heat. · Irregular cycling · The furnace doesn't blow hot air. · The furnace blows too Find the most common problems that can cause a Heil Furnace not to work - and the parts & instructions to fix them. Free repair advice! Manual valve shut off, proper flame sense microamps, gas valve defective or gas valve turned off, defective hot surface igniter, control ground continuity,. If your furnace repeatedly turns itself on and off, it's likely that the unit is not circulating properly. Should your Heil unit stop producing heat, begin to