What are the specs for this Transformer?

The correct replacement for Carrier model PH3GNA048000AA 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 PH3GNA048000AA.

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 PH3GNA048000AA

Name: OEM Carrier Transformer 75VA 208/240/480V–24V for PH3GNA048000AA
Brand: Carrier
SKU: CARRIE-PH3GNA048000AA-TRANSFORMER-HT01BD242
Price: 70.20 USD
Availability: InStock

SKU: CARRIE-PH3GNA048000AA-TRANSFORMER-HT01BD242 Brand: Carrier

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OEM Carrier Control Transformer 75VA 208/240/480V to 24V — HT01BD242 for Model PH3GNA048000AA

This is the factory OEM replacement transformer (part# HT01BD242) for the Carrier PH3GNA048000AA packaged unit. The transformer steps down high-voltage primary power — 208V, 240V, or 480V — to the 24V AC signal that powers your entire control circuit: thermostat, contactor coil, gas valve, and safety switches. When this transformer fails, the system goes completely unresponsive — no thermostat communication, no staging, nothing. It is one of the first components to check when a unit shows zero control activity despite line voltage being present at the unit.

Specs: 75VA rating | Primary: 208/240/480V | Secondary: 24VAC | 50/60 Hz | 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. Undersized or off-tolerance generic transformers can sag under load, causing intermittent lockouts and premature contactor coil failure.
Install difficulty: 3/5 — Requires de-energizing the unit at the disconnect and verifying zero voltage with a multimeter before touching any wiring. Tools needed: multimeter, flathead and Phillips screwdrivers, needle-nose pliers, wire nuts or spade terminals. Label all wires before removal. Verify primary voltage tap matches your supply voltage before energizing.
Warranty: 1-year OEM factory warranty. In-stock orders ship same business day from our warehouse.

Compatibility: Engineered as the direct OEM replacement for the Carrier PH3GNA048000AA packaged unit. Also cross-references across Carrier, Bryant, Payne, Tempstar, and Heil systems using the HT01BD242 specification. Always confirm primary voltage (208V, 240V, or 480V) on your unit's data plate before ordering. Our fitment team is available to verify compatibility before you buy — just reach out.

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 PH3GNA048000AA?

Yes. This is the factory-specified OEM transformer for the Carrier PH3GNA048000AA. 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 PH3GNA048000AA?

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 PH3GNA048000AA

OEM Carrier Control Transformer 75VA 208/240/480V to 24V — HT01BD242 for Model PH3GNA048000AA

Shipping Information

Return Policy

Frequently Asked Questions