The AI troubleshooting partner built for HVAC techs.
Stop guessing at the condenser. Pick the equipment, describe the symptoms, and TechDiagnose walks you through a ranked, step-by-step diagnosis with the exact tests to run and the safety warnings that matter.
What TechDiagnose does
Everything you need to narrow a callback fast.
From the first symptom to the final cause, the app guides you like a senior tech standing next to you — asking one useful question at a time, showing you what to check, and keeping every step on record.
Start diagnosing with HVAC tech-tested AI
Built on real field fault trees. The AI asks the same questions a senior tech would ask — one targeted step at a time.
Ranked causes and exact tests
Get the most likely failures in order, each with the specific measurements, pressures, voltages, and resistance values to confirm them.
Safety warnings up front
Refrigerant, electrical, combustion, and oil-burner hazards are flagged before you touch the unit, not buried in the notes.
Show the AI what you're seeing
Snap photos of error codes, control boards, wiring, or oil burner cad cells. Multimodal AI reads the image and folds it into the diagnosis.
Complete diagnostic history
Every question, answer, photo, and final cause is saved in a step-by-step timeline. Perfect for callbacks, warranty claims, and training.
Works offline, syncs later
No signal in the attic or basement? No problem. Start the diagnosis, cache the history, and sync when you're back on the network.
Equipment supported
Residential and light commercial systems, including oil-fired equipment.
Brand-specific intelligence
Select the manufacturer and model to get fault-code meanings, common failure patterns, and proprietary control behavior.
How it works
Four steps from symptom to solution.
Choose the unit
Pick equipment type, brand, and model so the AI knows the control logic it's working with.
Describe symptoms
Enter what you see and hear — or snap a photo of the board, nameplate, or error code.
Answer guided questions
The AI narrows the fault tree one binary question at a time, like a senior tech on the phone.
Get ranked causes
Receive likely failures, the tests to confirm them, and the safety warnings that apply.
Pricing
Start free, then $12.99 a month.
7-day free trial, no credit card required. Team plans are priced per technician with shared company history.
Team — Monthly
$10.99per tech/mo
Per technician, billed monthly. One account for the whole shop.
Start free trialTeam — Yearly
$109per tech/yr
Per technician, billed yearly. Best value for established shops.
Start free trialReady to stop troubleshooting blind?
Join HVAC technicians who use TechDiagnose to get to the right call faster, prove the repair, and keep a record of every callback.
Start diagnosing free