What are the specs for this Transformer?

The correct replacement for Carrier model PY1PNB036090AAAA 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 PY1PNB036090AAAA.

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 PY1PNB036090AAAA

Name: OEM Carrier Transformer 40VA 208/240V–24V for PY1PNB036090AAAA
Brand: Carrier
SKU: CARRIE-PY1PNB036090AAAA-TRANSFORMER-HT01BD209
Price: 47.25 USD
Availability: InStock

SKU: CARRIE-PY1PNB036090AAAA-TRANSFORMER-HT01BD209 Brand: Carrier

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OEM Carrier Control Transformer 40VA 208/240V to 24V — Model PY1PNB036090AAAA

This OEM Carrier transformer (part HT01BD209) is the factory-specified control transformer for the Carrier PY1PNB036090AAAA packaged unit. Its job is to step down the high-voltage line power (208/240V) to the 24V low-voltage signal used by your thermostat, control board, and every relay and valve in the system. When this transformer fails, the entire control circuit goes dark — the thermostat goes blank, the system refuses to respond to any call for heating or cooling, and contactors will not energize. A blown transformer is also often a symptom of a downstream short, so always check for wiring faults before installing a replacement.

Specs: Input 208/240V AC | Output 24V AC | 40VA power rating | 50/60 Hz | Direct OEM factory replacement for part number HT01BD209
OEM vs Generic: OEM transformers are wound and potted to Carrier's exact VA tolerance. Undersized or off-tolerance aftermarket units can overheat quickly when driving multiple 24V loads simultaneously, leading to repeat failures.
Install difficulty: 2/5 — Shut off all power at the disconnect and breaker before proceeding. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Always confirm input voltage matches your unit's data plate. Check for shorts on the 24V secondary before energizing.
Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Fits Carrier model PY1PNB036090AAAA packaged unit. Verify your data plate lists a 208/240V primary input and 24V secondary before ordering. Cross-reference OEM part number HT01BD209. Our team is available to confirm fitment — reach out before you order if you have any questions.

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 PY1PNB036090AAAA?

Yes. This is the factory-specified OEM transformer for the Carrier PY1PNB036090AAAA. 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 PY1PNB036090AAAA?

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 PY1PNB036090AAAA

OEM Carrier Control Transformer 40VA 208/240V to 24V — Model PY1PNB036090AAAA

Shipping Information

Return Policy

Frequently Asked Questions