HVAC & Boilers.
Where do you want to go?
Everything for diagnosing a boiler, heat pump, air conditioner or water heater — fault codes, specialists and professional tools.
HVAC Fault Codes
Every fault code, by brand and model — meaning, cause, severity and the verified fix.
Explore codes →
Find a specialist
Verified boiler and HVAC engineers near you — real reviews, phone and WhatsApp.
Find an engineer →
TroubleAtlas Pro subscription
For heating & cooling professionals: local visibility, AI reception and shop-management tools.
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TroubleAtlas Certified
The independent seal for boilers and heat pumps that meet our reliability standard.
Discover Certified →
TA YouTube Channel
Step-by-step repair videos on our own channel — subscribe for the latest fixes.
Watch now →
Used Marketplace
Buy & sell used parts, tools and workshop equipment — one place.
Independent reliability
scores for every boiler.
Beyond fault codes and specialists, we rate the reliability of HVAC brands and models — a transparent score that owes nothing to the manufacturer. The reference to check before you buy, install or trust a heating or cooling system.