HVACopediaThe field reference for HVAC technicians
Look up an error code, see what usually causes it and how to fix it, check the settings for the unit in front of you, and size the gas line, all from your phone on the job.
iPhone and Android apps are coming to the App Store and Google Play.
What's inside
We started HVACopedia for our own technicians, to stop digging through PDFs in a basement with one bar of signal. Here's what it does today.
Error codes and fix steps
Search by brand, model or code. Each code explains what it means, the usual causes and the steps to check, in plain language.
Settings and specs
DIP switches, jumpers and setup tables for common furnaces, boilers and tankless heaters, so you can set the board right the first time.
Technician tips and parts
Installer menu codes, button combinations, test modes and resets by brand, plus OEM part numbers by model, on this site and in the app.
Calculators and reference tables
Superheat, airflow, duct and wire size, combustion, psychrometrics, walk-in load, CSST gas sizing and meter clocking, plus pressure-temperature charts for 48 refrigerants. Free here, and offline in the app.
AI assistant
Ask a troubleshooting question in your own words and get a starting point. Always confirm with the manual before you act.
Works offline
Download the library to your phone and keep using it in crawl spaces, mechanical rooms and new builds with no signal.
Field reports
Found a code that isn't listed, or a fix that worked when the book didn't? Send it in with a photo and help the next tech.
Built by people who do the work
HVACopedia comes out of a working HVAC company in the Greater Toronto Area. The content is written by licensed technicians in our own words, checked against the manufacturer's documentation, and updated when the field tells us something is missing.
- Made for Canadian technicians and Canadian equipment
- Every code page links back to its source so you can check the original
- Free to browse; sign in to send reports and use the assistant
Suppliers and manufacturers
Want your products, parts and training in front of technicians at the moment they need them? We'd like to hear from you.
Partner with usFrequently asked questions
Quick answers about HVACopedia and the error code library.
What is HVACopedia?
HVACopedia is a field reference for HVAC and gas technicians. It lists error codes with likely causes and test steps, equipment settings, and calculators for gas pipe sizing and gas meter clocking, built for Canadian equipment.
Which brands and equipment does it cover?
The error code library covers 16 brands: AirQuest, Carrier, Daikin, FlowMax, Goodman, Heat & Glo, ICP, Lennox, Midea, Mitsubishi, Napoleon, Navien, Noritz, Rheem, Rinnai and Skytech, across furnaces, wall furnaces, air conditioners, air handlers, heat pumps, boilers, combi boilers, tankless water heaters and gas fireplaces.
Is HVACopedia free?
Yes. You can browse the error code library for free. You sign in to send field reports and to use the AI assistant.
Where do the error code explanations come from?
Licensed technicians write the content in their own words and check it against the manufacturer's documentation. Each code page names its source so you can check the original manual for your exact model.
Can I use it instead of the manufacturer's manual?
No. HVACopedia is a starting point. The manufacturer's manual for the exact model and local codes always take priority, and gas, electrical and refrigerant work must be done by a qualified, licensed person.
Does it work offline?
Yes. The app lets you download the library to your phone so you can keep using it in crawl spaces, mechanical rooms and new builds with no signal.
What if a code or fix is missing?
Send a field report from the app with a photo. Reports from technicians are how the library gets corrected and extended.
Who makes HVACopedia?
HVACopedia is made by Hvacopedia Tech Inc. in Vaughan, Ontario, and comes out of a working HVAC company in the Greater Toronto Area.