What are the specs for this Transformer?

The correct replacement for Carrier model PY3GNA042090NA 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 PY3GNA042090NA.

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 PY3GNA042090NA

Name: OEM Carrier Transformer 40VA 208/240V–24V for PY3GNA042090NA
Brand: Carrier
SKU: CARRIE-PY3GNA042090NA-TRANSFORMER-HT01BD209
Price: 47.25 USD
Availability: InStock

SKU: CARRIE-PY3GNA042090NA-TRANSFORMER-HT01BD209 Brand: Carrier

✓ Guaranteed to fit PY3GNA042090NA — or your money back. Terms

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OEM Carrier Control Transformer 40VA 208/240V to 24V for Model PY3GNA042090NA

This OEM Carrier transformer (part #HT01BD209) is the factory-specified replacement for the Carrier PY3GNA042090NA packaged unit. The transformer steps down the high-voltage supply (208/240V) to the 24V signal voltage that powers every component in the control circuit — thermostat, contactor coil, gas valve, and control board. When it fails, the entire system goes silent: no call-for-heat, no call-for-cool, no fan response. Nothing works until the transformer is replaced.

Specs: 208/240V primary input | 24V secondary output | 40VA power rating | 50/60 Hz | OEM part #HT01BD209 | Factory-matched for PY3GNA042090NA
OEM vs Generic: This is the genuine Carrier OEM transformer, wound to exact VA and voltage tolerances. Generic aftermarket transformers often run outside ±5% tolerance, causing nuisance board faults, burnt coils, and premature component failure across the entire control circuit.
Install difficulty: 2/5 — Disconnect power at the disconnect box and confirm zero voltage with a multimeter before touching any wiring. Photograph or label all low-voltage wires before removal. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Typical replacement time: 20–30 minutes.
Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse.

Compatibility: Designed as a direct OEM drop-in for Carrier PY3GNA042090NA packaged units. Verify your unit's data plate shows a 208/240V primary and 24V secondary control circuit before ordering. Our parts specialists are available to confirm fitment — order with confidence and get your system back online 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 $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 40VA 208...

$47.25

Frequently Asked Questions

Does this Transformer fit my Carrier PY3GNA042090NA?

Yes. This is the factory-specified OEM transformer for the Carrier PY3GNA042090NA. 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 PY3GNA042090NA?

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 40VA 208/240V–24V for PY3GNA042090NA

OEM Carrier Control Transformer 40VA 208/240V to 24V for Model PY3GNA042090NA

Shipping Information

Return Policy

Frequently Asked Questions