What are the specs for this Transformer?

The correct replacement for Carrier model PH4GPAA30000AA is this exact part. It is the factory-specified replacement with exact OEM specifications. Using a part with different specifications can cause equipment damage or void your warranty. You can verify this by checking the data plate on your Carrier equipment which lists the model number PH4GPAA30000AA.

Is this transformer compatible with Bryant or Payne systems too?

Many Carrier parts are cross-compatible with Bryant and Payne systems since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across multiple brand labels with different model numbers. To verify cross-compatibility, check your Bryant or Payne equipment service manual for cross-compatible part numbers, or contact info@nationalhvacparts.com with your model number for confirmation.

Carrier

OEM Carrier Transformer 75VA 208/240/480V–24V for PH4GPAA30000AA

Name: OEM Carrier Transformer 75VA 208/240/480V–24V for PH4GPAA30000AA
Brand: Carrier
SKU: CARRIE-PH4GPAA30000AA-TRANSFORMER-HT01BD242
Price: 70.20 USD
Availability: InStock

SKU: CARRIE-PH4GPAA30000AA-TRANSFORMER-HT01BD242 Brand: Carrier

✓ Guaranteed to fit PH4GPAA30000AA — or your money back. Terms

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OEM Carrier Control Transformer 75VA 208/240/480V to 24V for Model PH4GPAA30000AA

This is the factory OEM replacement transformer for the Carrier PH4GPAA30000AA packaged heat pump unit. The transformer steps down high-voltage line power (208/240/480V primary) to the 24V AC signal that powers your entire control circuit — thermostat, contactor coils, safety switches, and control board. When this transformer fails, the result is a completely unresponsive system: no thermostat communication, no staging, no heat or cool — as if the unit has no power at all. A failed transformer is often mistaken for a bad control board, making correct diagnosis critical before replacing more expensive components.

Specs: 75VA rating | Primary: 208/240/480V, 50/60Hz | Secondary: 24VAC | Foot-mount configuration | OEM part number HT01BD242
OEM vs Generic: This is a genuine Carrier OEM transformer wound to exact factory VA and voltage tolerances. Generic transformers often run under-rated VA, causing thermal overload and repeat failures under full control-circuit load.
Install Difficulty: 3/5 — Requires disconnecting 120/240V line-voltage wiring. Always shut off the disconnect and verify with a non-contact voltage tester before touching any wiring. Tools needed: multimeter, flathead and Phillips screwdrivers, needle-nose pliers. Photograph all wiring connections before removal.
Warranty: 1-year OEM factory warranty. In-stock orders ship same business day from our warehouse.

Compatibility: Designed for the Carrier PH4GPAA30000AA packaged heat pump unit. Also cross-references to Carrier, Bryant, Tempstar, and ICP family HVAC systems using OEM part number HT01BD242. Verify primary voltage (208/240/480V) matches your unit's data plate before ordering. Have questions about fitment? Our HVAC parts specialists verify compatibility before you buy.

Shipping Information

Orders placed before 3PM CST ship same business day
Standard delivery: 2-5 business days
Express shipping available at checkout
Free shipping on orders over $99
Tracking number emailed upon shipment

Return Policy

30-day returns on unused parts in original packaging
Electrical parts (capacitors, contactors, control boards) are final sale once installed
Email info@nationalhvacparts.com to initiate a return
Refunds processed within 5-7 business days

OEM Carrier Transformer 75VA 208...

$70.20

Frequently Asked Questions

Does this Transformer fit my Carrier PH4GPAA30000AA?

Yes. This is the factory-specified OEM transformer for the Carrier PH4GPAA30000AA. It is a direct drop-in replacement that fits without modification. Always verify the model number on your equipment nameplate before ordering.

How do I replace the transformer on my Carrier PH4GPAA30000AA?

Difficulty: Medium (30–45 min)
Step 1: Turn off breaker. Step 2: Photo wiring connections. Step 3: Disconnect wires from old transformer. Step 4: Remove mounting hardware. Step 5: Install new transformer, reconnect wires matching voltage ratings. Step 6: Verify 24V output with multimeter.

My thermostat has no power. What failed?

Thermostat with no display = failed 24V transformer (or blown control board fuse). Check the 3A/5A fuse on the control board first ($1–$5 fix). If fuse is good but no 24V output from transformer, replace transformer.

Is this transformer compatible with Bryant or Payne too?

Many Carrier parts are cross-compatible with Bryant and Payne since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across brand labels with different model numbers. To verify: check your Bryant or Payne equipment service manual for cross-compatible part numbers, or email info@nationalhvacparts.com with your model number.

Should I use OEM or aftermarket for my Carrier transformer?

OEM recommended for reliability and warranty compatibility. OEM parts match exact factory specifications for proper fit, performance, and safety. While aftermarket alternatives cost less upfront, the risk of improper fit and reduced lifespan usually makes OEM the better value long-term.

How fast does National HVAC Parts ship?

Orders placed before 3:00 PM CST ship the same business day. Standard delivery is 2–5 business days anywhere in the continental United States. Express shipping available at checkout. We ship from Houston, TX to all 50 states. 30-day return policy on all parts.

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OEM Carrier Transformer 75VA 208/240/480V–24V for PH4GPAA30000AA

OEM Carrier Control Transformer 75VA 208/240/480V to 24V for Model PH4GPAA30000AA

Shipping Information

Return Policy

Frequently Asked Questions