What are the specs for this Transformer?

The correct replacement for Carrier model PY3GPAA48115AA 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 PY3GPAA48115AA.

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 40VA 208/240V–24V for PY3GPAA48115AA

Name: OEM Carrier Transformer 40VA 208/240V–24V for PY3GPAA48115AA
Brand: Carrier
SKU: CARRIE-PY3GPAA48115AA-TRANSFORMER-HT01BD209
Price: 47.25 USD
Availability: InStock

SKU: CARRIE-PY3GPAA48115AA-TRANSFORMER-HT01BD209 Brand: Carrier

OEM Guaranteed

Same-Day Ship

30-Day Returns

Secure Checkout

Texas CMBL #19328542014

SAM.gov Registered

Govt POs Accepted

OEM Carrier Control Transformer 40VA 208/240V to 24V for Model PY3GPAA48115AA

This genuine OEM Carrier control transformer (part #HT01BD209) is the factory-specified replacement for the Carrier PY3GPAA48115AA packaged unit. The transformer steps down line-voltage power (208/240V primary) to the 24V low-voltage signal required by your thermostat, control board, contactor coil, and all other safety controls. When this transformer fails, the entire control circuit loses power — your thermostat goes blank, the unit becomes completely unresponsive, and no heating or cooling cycle can begin. It is one of the most common and most overlooked causes of a total system lockout.

Specs: 40VA capacity | 208/240V primary input | 24V secondary output | 50/60 Hz | Class 2 control transformer | Replaces HT01BD207, HT01CN232, 9076-00
OEM vs Generic: This is a genuine Carrier OEM transformer, wound to exact factory VA and voltage tolerances. Undersized or off-spec generic transformers can overheat, trip the built-in thermal fuse, and cause repeat failures that damage downstream control boards.
Install difficulty: 2/5 — Disconnect power at the breaker and verify zero voltage with a multimeter before touching any wiring. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or terminal connectors. Label all wires before removal. Typical job time: 20–30 minutes.
Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse — order by 3PM local time for same-day dispatch.

Compatibility: Direct OEM fit for Carrier model PY3GPAA48115AA. Always verify input voltage (208V or 240V) against your unit's data plate before ordering. This transformer is also compatible with select Bryant and Payne units sharing the same control circuit architecture. Not sure it's the right part? Our HVAC parts specialists verify fitment before you order — contact us today.

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 $75
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 40VA 208...

$47.25

Frequently Asked Questions

Does this Transformer fit my Carrier PY3GPAA48115AA?

Yes. This is the factory-specified OEM transformer for the Carrier PY3GPAA48115AA. 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 PY3GPAA48115AA?

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.

Menu

OEM Carrier Transformer 40VA 208/240V–24V for PY3GPAA48115AA

OEM Carrier Control Transformer 40VA 208/240V to 24V for Model PY3GPAA48115AA

Shipping Information

Return Policy

Frequently Asked Questions