What are the specs for this Transformer?

The correct replacement for Carrier model PY3PNA030040NB 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 PY3PNA030040NB.

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 Control Transformer 40VA 208/240V for PY3PNA030040NB

Name: OEM Carrier Control Transformer 40VA 208/240V for PY3PNA030040NB
Brand: Carrier
SKU: CARRIE-PY3PNA030040NB-TRANSFORMER-HT01BD209
Price: 47.25 USD
Availability: InStock

SKU: CARRIE-PY3PNA030040NB-TRANSFORMER-HT01BD209 Brand: Carrier

✓ Guaranteed to fit PY3PNA030040NB — or your money back. Terms

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OEM Carrier 40VA Control Transformer HT01BD209 for Model PY3PNA030040NB

This OEM Carrier control transformer (part #HT01BD209) is the factory-specified replacement for the Carrier PY3PNA030040NB packaged unit. The transformer steps down the 208/240V line voltage to the 24V signal required to power the entire low-voltage control circuit — including the thermostat, contactor coil, gas valve, and control board. When this part fails, the system goes completely unresponsive: no thermostat communication, no staging, no heat or cool. A failed transformer is one of the most common causes of a fully dead HVAC system.

Specs: 208/240V primary input | 24V secondary output | 40VA power rating | 50/60 Hz | Factory-matched OEM tolerances for the PY3PNA030040NB control circuit
OEM vs Generic: The OEM HT01BD209 is wound to Carrier's exact VA rating and insulation class. Generic transformers frequently run under-rated VA, leading to overheating and premature failure under full control-load conditions.
Install difficulty: 2/5 — De-energize and lock out power before starting. Tools needed: multimeter, flathead/Phillips screwdrivers, wire stripper, needle-nose pliers. Photograph or label all 24V wiring before disconnecting terminals. Verify primary voltage tap matches your supply voltage before powering up.
Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse.

Compatibility: Designed for the Carrier PY3PNA030040NB packaged unit. Verify your unit's supply voltage (208V or 240V) against the transformer's primary tap before installation. Cross-references include HT01CN232 and HT01CN233. Questions about fitment? Our HVAC parts specialists confirm compatibility before you order — ships same day.

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 Control Transformer ...

$47.25

Frequently Asked Questions

Does this Transformer fit my Carrier PY3PNA030040NB?

Yes. This is the factory-specified OEM transformer for the Carrier PY3PNA030040NB. 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 PY3PNA030040NB?

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 Control Transformer 40VA 208/240V for PY3PNA030040NB

OEM Carrier 40VA Control Transformer HT01BD209 for Model PY3PNA030040NB

Shipping Information

Return Policy

Frequently Asked Questions