0130M00138S – TRANSFORMER (240V, 40VA, PF40224)
$35.86Goodman 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.
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0130M00140S – TRANSFORMER (120V, 40VA, PF40115)
$42.92Goodman 0130M00140S transformer, 120V to 24V, 40VA. Steps down line voltage to 24V for the thermostat and control circuit. Direct OEM replacement for Goodman/Amana.
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46-TLT40 – TRANSFORMER (120/208/240 to 24V, 40VA)
$31.99Multi-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.
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SXT100R – STEP-DOWN TRANSFORMER (120V, 208, 230V, 480V to 24V, 96VA)
$51.90Multi-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.
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
📞 (214) 340-9421Mon–Fri 10 am – 7 pm | Sat 10 am – 3 pm