Dive into the logic of an HVAC Service Tech to diagnose dozens of common furnace problems.

00:00 Introduction
00:16 Confirm Power, Fuel, Call for heat
00:28 Checking Thermostat
00:49 Confirming Power
02:03 Testing Door Switch
02:23 Confirming Fuel
02:51 Sequence
03:03 Checking 3 or 5 amp fuse
03:35 Securing Door Switch
03:46 Repowering Furnace / Time Delays
04:31 Inducer Motor / Limit Switch Problems
06:24 Inducer Motor / Thermostat Problems
07:17 Inducer Motor / Control Board Problems
07:36 Inducer Motor / Bad Motor / Jammed Cage
08:19 Pressure Switch Problems / Testing
09:31 Pressure Switch / Flue Pipe Problems
09:59 Pressure Switch / Blocked Tubing
10:27 Hot Surface Ignitor / Testing
11:40 Gas Valve / Testing / Burner Issues
12:48 Flame Sensor Problems
13:57 Blower Motor