r/HomeFixers crowdsources a guide to diagnosing a dead furnace before calling a pro
The flowchart in the top comment has saved people hundreds of dollars.
A 2,300-comment thread turned into a community-edited troubleshooting flowchart. Several HVAC technicians contributed and flagged which steps are unsafe for DIY.
Product SparkGuided repair with a "stop here" line
What product does this inspire or accelerate?
The flowchart's best feature is where it tells you to stop and call someone. Apps rarely do that.
Wade InCheck your furnace filter this weekend
How can you try this yourself this weekend?
Step one of the flowchart, and the most common fix.
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How a modern furnace starts upEach step, and what can fail. · The Understory · Swim · 30 min7