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In heating and cooling equipment, a transformer steps line voltage down to 24 V. This lower voltage powers low-voltage controls like the thermostat, contactor coil, and control board.
Specifications
- Part number: 030824
- Brand: Norlake
- Part type: Transformer
- Height: 3.3 in / 8.38 cm
- Length: 5.05 in / 12.83 cm
- Voltage: 120VAC
- Width: 4.95 in / 12.57 cm
- 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 the Transformer Does
Most home thermostats, contactor coils, and control boards run on a 24 V control signal. The transformer supplies this power by taking high supply voltage and converting it down to low voltage.
Without a working transformer, your system controls cannot send or receive signals. The thermostat screen may go blank, and the system will not turn on.
Understanding the Specs for Part 030824
The 030824 transformer has specific physical dimensions and electrical ratings that must match your equipment space and wiring.
Make sure the replacement matches the physical space in your cabinet and the supply voltage from your line.
- Voltage: 120VAC
- Height: 3.3 in / 8.38 cm
- Length: 5.05 in / 12.83 cm
- Width: 4.95 in / 12.57 cm
How to Confirm a Replacement Matches
Matching a transformer requires checking both electrical ratings and physical size.
Always check the following ratings on your old part before choosing a replacement:
- 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
Why Transformers Fail and Safe Replacement Steps
A transformer rarely burns out on its own. A shorted thermostat wire or a bad part on the 24 V side can burn it out. You must find and fix the cause before you swap the part, or the new transformer will fail too.
If you are ready to replace the part safely, follow these straightforward steps:
- Turn off electrical power at the breaker panel and test for power to confirm the unit is dead.
- Take a photo of every wire before removing the old part so you have a clear reference.
- Loosen the mounting screws and remove the old transformer.
- Mount the new transformer in the same location.
- Move wires one at a time to the same spots on the new part.
- Restore electrical power at the breaker panel and verify operation.
Read your old part
- Turn off power to the unit and open the access panel to reach the old transformer.
- Locate the identification sticker or stamped label on the transformer body.
- Check that the part number on the label reads 030824.
- Confirm the input voltage matches 120VAC and the output is 24 V.
- Measure the old part to confirm it matches the length of 5.05 in / 12.83 cm, width of 4.95 in / 12.57 cm, and height of 3.3 in / 8.38 cm.
When to call a pro
The input side of a transformer carries line voltage. If you are not sure how to test wires safely or cannot find what shorted out the old unit, call a licensed HVAC technician to find the short and complete the repair.
Questions
What voltage does the 030824 transformer take?
The listed voltage rating for part number 030824 is 120VAC. The input voltage must match your equipment supply voltage.
Why did my old transformer fail?
A shorted thermostat wire or a bad component on the 24 V control side can draw too much current and burn out the transformer. It is important to find the short before putting in a replacement.
What should I do before disconnecting any wires?
Turn off power at the breaker and test for power to make sure it is safe. Then take a clear photo of every wire so you can move them one at a time to the matching spots on the replacement.
Related part numbers
- 072809Transformer Reference Guide, NorlakeSame brand and type
- 0130M00138STransformer Specs and Guide, GoodmanSame part type
- 25957Flame Sensor Reference, NiecoMore part numbers
- 300731Temperature Control Board, ClevelandMore part numbers
All part numbers · Part number replacements · Shop transformers · Repair guides
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.