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Most home thermostats, contactor coils, and control boards use a 24 V control signal from a transformer. Without this low-voltage power, your system cannot respond to calls for heating or cooling.
Specifications
- Part number: 0130M00138S
- Brand: Goodman
- Part type: Transformer
- Dimensions: 3.8 × 3 × 2.1 in
- Input voltage: 208 - 240 V
- Output voltage: 24 VAC
- 0130M00138
- B1141643
- L38-264
- L38264
- Input volts: must match your supply, like 120 or 208/240
- Output: 24 V for most home systems
- VA: same or higher than your old one
From the maker's and parts sellers' listings for this number. Compare them with the label on your old part.
What this transformer does
Your HVAC system receives high voltage from your home electrical panel. The Goodman 0130M00138S transformer takes that incoming power and steps line voltage down to 24 V.
That lower voltage supplies the power needed for your thermostat, contactor coil, and control board. It allows these parts to communicate and start cycles safely without sending full line voltage through low-voltage control lines.
Understanding the part specs
Reading the numbers on the side of your transformer helps ensure you have the right match. The specs for the Goodman 0130M00138S are:
Input voltage must match your equipment power supply. Output voltage must meet the needs of your control board and thermostat to keep the system running properly.
- input voltage: 208 - 240 V
- output voltage: 24 VAC
- dimensions: 3.8 × 3 × 2.1 in
Confirming a replacement match
When matching a transformer, input volts must match your supply, like 120 or 208/240. The output should be 24 V for most home systems, and the VA rating should be the same or higher than your old one.
The 0130M00138S is listed as replacing several older numbers. If your old part shows any of the following numbers, this unit matches:
- 0130M00138
- B1141643
- L38-264
- L38264
Why transformers fail and how to replace them
A shorted thermostat wire or a bad part on the 24 V side can burn out a transformer. If a transformer fails, you must find and fix the cause before you swap it. Installing a new part into an active short can burn out the new part right away.
Follow safe work habits whenever handling electrical components:
- Shut off power at the main breaker and test for power to confirm the equipment is cold.
- Take a photo of every wire before removing the old part so you have a clear map.
- Move wires one at a time to the same spots on the new part.
- Restore power only after all connections are secure and covers are back in place.
Read your old part
- Turn off power to the unit and open the access panel.
- Locate the metal casing or label on your existing transformer.
- Check the label for part number 0130M00138S.
- If that number is not there, check for 0130M00138, B1141643, L38-264, or L38264.
- Confirm the input voltage on the label reads 208 - 240 V and the output reads 24 VAC.
When to call a pro
The input side carries line voltage. If you are not sure how to locate a short, test for voltage, or wire the new part, a licensed tech can find the short and replace it safely. Hire a licensed HVAC technician for any step you are not sure you can do safely.
Questions
What parts does the 0130M00138S transformer power?
It steps line voltage down to 24 V. This powers the thermostat, contactor coil, and control board in your HVAC system.
What can cause this transformer to burn out?
A shorted thermostat wire or a bad part on the 24 V side can burn it out. You should always find the cause of the problem before you swap in a new one.
What part numbers does the 0130M00138S replace?
It is listed as replacing part numbers 0130M00138, B1141643, L38-264, and L38264. Check your old label to see if any of these numbers match.
What should I do before disconnecting any transformer wires?
Turn off power at the breaker and test for power before touching anything. Take a photo of every wire so you can move them one at a time to the matching terminals.
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Brand names and part numbers identify the part and show fit. HVAC Fitter is not affiliated with, authorized by, or endorsed by any equipment maker. If you are not sure a repair is safe for you, call a licensed HVAC technician.