Description
The Supco ECMPRO Universal ECM Motor Tester is a pocket-size tool that lets you see (within seconds) whether an electronically commutated motor (ECM) is good or bad.
The ECMPRO is a universal tester because it works with the three low-voltage harness options that cover nearly all residential blower motors built since the late 1990s.
Clip the two test leads onto the system’s 24-volt terminals, plug the four-pin connector into the motor, and flip the switch. If the motor spins, it’s good. If it doesn’t, replace the motor. No batteries, menus, or guesswork required.
The ECMPRO is a truly functional test, not an analytics tool. It simply proves the motor can run. It doesn’t read RPM, CFM, or fault codes but it’s still useful when a control board shows mystery errors.
Key Features & Benefits
Works on every ECM
Adapters work with the ECM 2.3 (16-pin), ECM 3.0 (4-pin), and constant-torque/X13 or Evergreen® motors. Works for Broad-Ocean models that share the same pinout as well.
Pass/Fail (Good/Bad) result
Gives an instant pass/fail result ideal for quick troubleshooting on service calls. It has two LEDs status lights: 24 VAC present and Start. If Start lights up but the blower never ramps, swap the motor.
Powered by the system’s 24 VAC
No batteries to buy or forget. An LED confirms you have 24 V at the tester. You must leave the motor’s 120/240 VAC harness connected. ECMPRO only wakes the control module.
24-inch leads & magnetic case
Long, flexible leads reach awkward control boxes, while the magnet lets you park the tester on any metal surface and free both hands.
Short-circuit protection
Internal circuitry guards against accidental lead shorts, protecting both the tester and the HVAC control board.
Lightweight and durable
Weighs only about 5.5 oz and fits easily into a tool pouch.
TradeFox™ technician-invented
Part of SUPCO’s TradeFox line—tools designed by working techs to solve everyday field problems.
What’s in the Box
- ECMPRO Universal ECM Tester
- 24-inch test leads with alligator clips
- Built-in 4-pin ECM motor connector
- Integrated magnetic back and rubberized housing
Typical Uses
- Diagnose constant-torque and variable-speed ECM blower motors in furnaces and air handlers
- Verify X13, Evergreen®, Broad-Ocean, and other replacement motors before installation
- Rule out motor failure when troubleshooting “no-airflow”
FAQs
Does the Supco ECMPRO work on X13 motors?
Yes. The ECMPRO is wired specifically for constant-torque X13 ECM blower motors, Evergreen® replacements, Broad-Ocean, and most OEM four-pin ECM designs. Clip the 24-V test leads to R and C, plug the four-pin harness into the motor, and flip the switch—if the shaft spins, the X13 is good.
Does lead polarity matter with the ECMPRO ECM motor tester?
No. The tester runs on 24 VAC, so lead polarity is irrelevant. Simply connect one alligator clip to the 24-V “R” terminal and the other to the “C” common. An LED confirms you have the correct control voltage before the motor test begins.
How does the ECMPRO protect against short circuits?
The ECMPRO has built-in electronic short-circuit protection on its 24-V power path. If the test leads accidentally touch each other (or a grounded cabinet) the internal circuit limits current and shields both the ECM tester and the furnace control board from damage.
Why won’t the motor spin even though both LEDs are on?
Make sure the motor’s high-voltage plug is still connected. ECMPRO only sends the 24 V start command.
Will it run a three-wire constant-torque (X13) blower?
Yes. Clip the built-in four pins to the motor terminals and attach the red “rotation” lead as shown in the guide.
Can it vary speed or airflow?
No. The tool delivers a fixed start signal—it’s a good/bad motor check, not a programmer.
Does it diagnose the module separately from the stat?
It helps isolate a bad motor/module from a bad furnace board. If ECMPRO starts the motor, the control board or wiring is suspect.
Any common pitfalls?
• Forgetting to reconnect the 5-pin high-voltage plug after testing.
• Trying it on proprietary communicating motors (it won’t talk to Trane Hyperion ETC).
What if I see no 24 VAC LED?
The furnace’s R and C aren’t reaching the tester—blown low-voltage fuse or open float switch are usual suspects.
