What data does the Trane diagnostic system report?

On communicating Trane systems (Trane Link or ComfortLink II), the diagnostic data includes fault and alert codes with severity classification, indoor temperature and humidity trends, system runtime history, compressor operating speed (variable speed units), blower airflow verification, coil temperatures, electronic expansion valve position, and refrigerant pressure status. On non-communicating systems paired with an XL824 thermostat, the system still reports temperature data, maintenance reminders, and malfunction alerts.

Do I have to pay for Trane diagnostics monitoring?

No. Trane Diagnostics remote monitoring is free for homeowners. Homeowners enroll once through the Trane Home app by granting their dealer monitoring access. There is no monthly fee for the diagnostic monitoring feature.

Which Trane thermostats support connected diagnostics?

Trane's connected diagnostics are supported on the Trane UX360 (current generation with Trane Link), ComfortLink II XL1050, ComfortLink II XL850, and XL824 smart thermostats. For the deepest equipment-level diagnostics, a fully communicating Trane system (outdoor unit, air handler or furnace, and thermostat all using Trane Link or ComfortLink II protocol) is required. The XL824 provides connectivity and basic monitoring with any standard HVAC system.

Controllers of Your Comfort — Trane Connected Diagnostics

Name: Hartzell’s Heat & Air
Address: 602 S Main St, Kingfisher, Oklahoma, 73750, US
Telephone: 405-375-4822

Most HVAC systems fail silently. Your equipment starts struggling weeks before you feel it — efficiency drops, fault codes accumulate, a component heads toward failure. By the time you notice the house isn’t comfortable, the problem has been building for a while. Trane’s connected diagnostic system changes that. Hartzell’s Heat & Air monitors your system in real time. In most cases, we know you have a problem before you do.

From preventative maintenance to predictive diagnostics.

Your Trane system reports its own health. We watch it. You just stay comfortable.

How It Works

Think of it like a security company monitoring your home — except instead of watching for intruders, we’re watching your HVAC system. Here’s what happens when you enroll:

Your Trane thermostat connects to the Trane Home platform — The thermostat sends continuous system data: temperatures, runtime, fault codes, equipment performance, and more.
You enroll in Trane Diagnostics once — A one-time opt-in through the free Trane Home app grants Hartzell’s access to your system’s data. You stay in control — you can see everything we see, and you approve any remote access request before we make changes.
We monitor from our dealer portal — Hartzell’s sees real-time data for all enrolled systems. When the system flags an issue, we get an automatic alert.
We reach out before you call — We contact you, explain what the data shows, and in most cases arrive with the right diagnosis and the right parts — because we already know what’s wrong.

What the System Reports

On a fully communicating Trane system (Trane Link or ComfortLink II), the data goes deep:

Fault & Alert Data

Fault codes with severity classification (Critical / Major / Normal)
Alert history with timestamps and runtime at time of fault
Lockout events and reset history
Low-pressure switch trips (refrigerant / airflow indicators)
Ignition and flame sensor faults (furnaces)

Equipment Performance

Compressor operating speed (variable speed units)
Blower CFM — verified airflow delivery
Coil temperature data
Electronic expansion valve position
Refrigerant pressure and charge status

System & Comfort Data

Indoor temperature and humidity trends
Runtime history and cycle frequency
Filter change reminders
Scheduled maintenance alerts
Remote thermostat settings history

The Trane Home App — Your Side of the Picture

While Hartzell’s monitors from the dealer portal, you have the same view from the free Trane Home app (iOS and Android). The app lets you:

Control and schedule your thermostat from anywhere
Monitor indoor temperature and humidity in real time
Receive your own alerts for filter changes and maintenance
Approve or deny any Dealer Remote Access request — you stay in control
Set geofencing to auto-adjust temperature when you leave and return
Integrate with Amazon Alexa and Google Home voice control

Trane Diagnostics remote monitoring is free. There is no monthly fee for the diagnostic monitoring feature.

Compatible Trane Thermostats

Trane UX360 + SC360

Current generation. Trane Link communicating protocol. Deepest diagnostic integration. Sensor-verified installs. BLE on-site diagnostics via Technician App.

ComfortLink II XL1050 / XL850

Previous generation ComfortLink II communicating platform. Full remote diagnostics. Built-in Z-Wave hub for smart home integration.

XL824 Smart Thermostat

Works with any standard HVAC system. Provides Trane Diagnostics connectivity, temperature/humidity monitoring, maintenance alerts, and malfunction notification via Wi-Fi.

Full equipment-level diagnostics (compressor speed, airflow, refrigerant data) require a fully communicating system: Trane Link or ComfortLink II outdoor unit, air handler or furnace, and compatible thermostat.

Why This Matters With Dave’s 360° Plan

Connected diagnostics and Dave’s 360° Plan are designed to work together. The plan covers your two seasonal checkups, priority scheduling, and repair discounts. The Trane Home system watches everything in between — 24 hours a day, 365 days a year. Together, you get a maintenance relationship that’s genuinely proactive, not just reactive.

Learn about Dave’s 360° Plan ›

Frequently Asked Questions

How does Hartzell’s know about my HVAC problem before I do?
When you enroll in Trane Diagnostics, your thermostat continuously transmits system data to a dealer monitoring portal. When the system detects a fault, Hartzell’s receives an automatic alert — often before you notice any change in comfort. We can diagnose remotely, then arrive already knowing what’s wrong and what parts to bring.

What is the Trane Home app?
The Trane Home app (formerly Nexia) is Trane’s free connected thermostat platform for homeowners. It lets you control your thermostat remotely, monitor conditions, receive alerts, and enroll in Trane Diagnostics dealer monitoring. Available free on iOS and Android.

What data does the system report?
On communicating Trane systems: fault codes with severity classification, compressor speed, blower airflow, coil temperatures, refrigerant pressure, runtime history, and maintenance reminders. On standard systems with an XL824: temperature data, malfunction alerts, and maintenance reminders.

Is there a cost for monitoring?
No. Trane Diagnostics remote monitoring is free for homeowners. One-time enrollment through the Trane Home app. No monthly fee for the diagnostic feature.

Which Trane thermostats support this?
The Trane UX360 (current Trane Link generation), ComfortLink II XL1050, ComfortLink II XL850, and XL824. For the deepest diagnostics, a fully communicating system is required. The XL824 provides connectivity and monitoring with any standard HVAC equipment.