Multi-voltage step-down transformer, 120/208/240/480V to 24V, 100VA with built-in circuit breaker. Heavy-duty for systems that need more than 40VA. Foot mount.
Goodman 0130M00140S transformer, 120V to 24V, 40VA. Steps down line voltage to 24V for the thermostat and control circuit. Direct OEM replacement for Goodman/Amana.
Multi-tap transformer, 120/208/240V to 24V, 40VA. Universal foot-mount design fits most residential and light commercial HVAC systems. Replaces Jard 4031OEM and Mars 44517.
Goodman 0130M00138S transformer, 208/240V to 24V, 40VA. Steps down line voltage for the control circuit. Direct OEM replacement for Goodman/Amana air handlers and furnaces.
Signs You May Need a New Transformer
The transformer steps down your home's 120V or 240V power to the 24V that operates the thermostat, control board, and gas valve. When it fails, the low-voltage control circuit goes dead.
⛔Thermostat Screen Is Blank▼
The thermostat has no display and doesn't respond to any buttons.
For hardwired thermostats, this often indicates no 24V power from the transformer.
Battery-powered thermostats may still show a display even if the transformer is dead.
⚡Furnace or AC Completely Unresponsive▼
No lights on the control board, no error codes, no blower — nothing.
The system appears to have no power even though the breaker is on.
Check for a blown fuse on the control board first — a shorted thermostat wire is a common cause.
If the fuse keeps blowing after replacement, there's likely a short in the thermostat wiring. Don't just keep replacing fuses — find the short.
🔊Buzzing or Humming from the Transformer▼
An audible buzz or hum coming from inside the furnace cabinet.
Some hum is normal, but a loud buzz can indicate the transformer is failing.
A transformer that's hot to the touch is being overloaded.
Not sure which part you need? Bring your old part to our Dallas store — our team will test it for free and help you find the right replacement. 📞 (214) 340-9421Mon–Fri 10 am – 7 pm | Sat 10 am – 3 pm
