HOW IT WORKS
Know Before You Go:
How Diagvance Works
A 5 step workflow turns the model, control board and fault code from a service call into a factory grounded brief, so the technician arrives knowing what to check and what to bring.
THE PROBLEM
HVAC Troubleshooting Still Runs on Guesswork
Fault codes say that something is wrong, not why. Here is where service teams lose the most time.
01
Codes without causes
One fault code can point to a failed sensor, a wiring issue, blocked airflow or a worn part. The technician still has to narrow it down on site.
02
Knowledge that stays in heads
Diagnostic experience lives with individual technicians and rarely becomes shared, searchable knowledge for the rest of the team.
03
Repeat visits
A wrong first guess means another trip, more downtime and higher cost for the customer and the contractor.
04
Wrong part on the truck
Without the model and fault code before dispatch, the technician often arrives without the part the job needs.
THE WORKFLOW
From Service Request to Technician Brief
Five steps: online intake, AI diagnosis from the factory database, dispatcher alert, technician brief before arrival, and a customer update.
INPUT
Online Intake
"No heat. Furnace starts, then shuts down after about 30 seconds."
The customer or the office records symptoms, equipment model and fault code before the visit.
→
PROCESS
AI Diagnostic Engine
Symptoms
Fault codes
Model and board
Matches model, control board, fault code and symptoms against the factory database and ranks the likely causes.
→
OUTPUT
Technician Brief
1. Likely causes, ranked
2. Next factory test
3. Parts to bring
A short brief the technician reads before arriving. The dispatcher gets an alert and the customer gets an update.
Illustrative example. The brief is pre arrival routing plus the next factory test. The final diagnosis always stays with the qualified technician.
WHAT THE RESEARCH SHOWS
Fault Detection Pays Back, According to Independent Data
Fault detection and diagnostics (FDD) software analyzes building system data to find HVAC faults. Large studies show what that is worth.
MEDIAN RESULTS AFTER TWO YEARS
9%
Median energy savings with FDD software
4%
Median energy savings with energy information systems
1 to 2 yr
Simple payback period reported
FDD software · 9%
Energy information systems · 4%
Source: Lawrence Berkeley National Laboratory study, reported by the U.S. Department of Energy. Full research on the LBNL publications page. These are third-party results for commercial buildings, not Diagvance results.
WHAT WE OFFER
What Is Ready and What Is Coming
Each part is labeled with where it stands today, so you know what works now and what is still coming.
WORKING SYSTEM
AI Diagnosis
Turns a service request into a technician brief with probable faults, reasoning and the next test to run.
WORKING SYSTEM
Service Request Triage
Scores incoming HVAC requests by urgency so critical calls are handled first.
IN DEVELOPMENT
Field Measurements
Technician meter readings, entered on the phone, to confirm the likely cause on site.
IN DEVELOPMENT
Factory Diagnostic Database
Fault codes, model families, control boards and test sequences from manufacturer documentation, growing with field experience.
WHO IT IS FOR
Made for HVAC Service Companies and Technicians
Technicians
The users. A clearer starting point on site, with the next factory test in hand.
Owners and service managers
The buyers. Fewer return visits, the right part on the truck and consistent diagnosis across the team.
Dispatchers
An alert with the likely cause, so the right technician and the right part go out the first time.
WHY TRUST DIAGVANCE
Built in the Open, Claimed Carefully
We label what works today, what is still in design and what is unverified. Our fault code database is private, but the approach is documented and the build is shared openly on GitHub and LinkedIn. Learn more about Diagvance.
5
Workflow steps, call to brief
3
Design partner pilots
Open
Progress shared publicly
VIDEO
See the Diagnostic Workflow in Action
A short walkthrough of how a service request becomes a technician brief.
▶
Video coming soon
FAQ
Common Questions
What is HVAC fault detection and diagnostics?
FDD software analyzes system data to find HVAC faults and help explain their causes, so repairs can start from a clearer picture.
Does Diagvance replace the technician?
No. Diagvance prepares a structured brief with probable faults, reasoning and next tests. The technician makes the final call on site.
Is Diagvance available today?
Diagvance is early stage. The diagnostic workflow runs today and is being tested in a free shadow mode pilot with 3 design partners. Contact us to apply or to see a demo.
HOW CAN WE HELP YOU?
Want to See Diagvance on Your Service Calls?
Tell us about your HVAC work and we will show you how the diagnostic workflow fits. Prefer to read first? Visit the Diagvance homepage.
Contact Diagvance →© 2026 Diagvance | Data Security | Pilot | Pricing | Contact