HVAC Fault Detection & Diagnostics

Find the HVAC faults your BAS alarms don't explain— ranked by dollars.

LeanFM analyzes the trend data your building already produces to identify hidden control, schedule, sensor, and equipment faults; show the evidence and root cause; and verify what the fixes return. No new sensors. No control writes.

$105,000/yr identified · 220,000 sq ft school

01 — Why not just your BAS?

Your BAS may report everything's normal. The data proves otherwise.

Your building automation system alarms when something breaks. It can't tell you when something's quietly wasting money — a stuck economizer or simultaneous heating and cooling looks perfectly normal to the BAS. The same points, read two ways:

BAS alarm summary● Normal
RTU-2 · heating / coolingOK
AHU-1 · economizerOK
VAV-2-08 · scheduleOK
AHU-3 · supply fanOK
CHW plant · pumpsOK

0 active alarms

Same points · LeanFM analysis6 findings

Waste accruing daily

02 — How it works

From BAS trend data to verified HVAC priorities.

LeanFM supplies the diagnosis and the evidence. Your controls or service team remains in charge of the BAS and makes the changes.

01 · EXPORT

Use the data you have

Start with a BAS trend export or an approved read-only connection. No new sensors.

02 · DIAGNOSE

Find hidden HVAC faults

Detect control, schedule, sensor, and equipment patterns that threshold alarms miss.

03 · QUANTIFY

Rank by dollar impact

See the evidence, likely root cause, confidence, and estimated annual cost.

04 · FIX

Your team makes the change

Your BAS, controls, or service provider remains responsible for remediation.

05 · VERIFY

Confirm what returned

Re-read the trend data and report identified and captured savings separately.

03 — The output

A fault your BAS calls normal. A decision your team can defend.

Illustrative finding · RTU-2$18,400/yr

Diagnosis: simultaneous heating and cooling during occupied hours. Evidence and likely root cause are attached to the finding.

Verification after your team's fix● Verified
Sequence change completedTEAM
Heating/cooling overlapCLEARED
Post-fix trend periodREVIEWED

LeanFM verifies the result in the trend data and keeps estimated opportunity separate from captured savings.

View a representative sample report

04 — Choose your path

One HVAC FDD specialty. Two ways to put it to work.

05 — Documented results

Found money, on the record.

K-12 · 220,000 sq ft $105,000/yr

In annual savings opportunities identified in one school — led by simultaneous heating and cooling, plus schedule faults that never tripped an alarm.

See the K-12 result
The Andy Warhol Museum $56,386

Reported first-year savings — growing to $101,383 in year two — in one of the most demanding climate environments there is: art conservation.

See the documented result
How results are reported Identified ≠ captured

LeanFM keeps estimated opportunities separate from savings verified after corrective action.

See the reporting format
Start with one building

See what your BAS trend data can explain.

Send one building's existing trend export. We'll confirm the data fit and return a free sample analysis with evidence-backed findings ranked by dollar impact.