HVAC Cheat Sheethvaccheatsheet.com/diagrams/furnace-safeties
Where a gas furnace's safety switches and ignition parts are
Simplified upflow furnace showing burners, igniter, flame sensor, rollout switch, inducer with pressure switch, high limit, control board fuse and blower.
Guides that use this diagram
- Furnace Flame Sensor: Microamp Readings, Cleaning and When to Replace
- Furnace Control Board Fuse Blown (3A): Finding the 24V Short
- Furnace High Limit Switch Tripping: Causes and How to Fix It
- Furnace Ignition Lockout: Failed Ignition Troubleshooting Step by Step
- Furnace Pressure Switch Troubleshooting: Open, Stuck Closed and Dropping Out
- Furnace Flame Rollout Switch Tripped: What It Means and What to Check
More gas furnaces diagrams
HVAC Cheat Sheet · Free PT charts, code lookups and calculators for techs at hvaccheatsheet.com