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OEM Carrier Control Transformer 40VA 208/240V for PY3PNA036090NA
Carrier

OEM Carrier Control Transformer 40VA 208/240V for PY3PNA036090NA

SKU: CARRIE-PY3PNA036090NA-TRANSFORMER-HT01BD209 Brand: Carrier
✓ Guaranteed to fit PY3PNA036090NA — or your money back. Terms

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Texas CMBL #19328542014
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OEM Carrier Control Transformer 40VA 208/240V to 24V for Model PY3PNA036090NA

This OEM control transformer (part #HT01BD209) is the factory-specified replacement for the Carrier PY3PNA036090NA packaged unit. The transformer steps down the 208/240V line voltage to the 24V signal used by your thermostat, contactor coil, and control board. When this part fails, the entire low-voltage control circuit goes dark — the system will not respond to thermostat calls for heat or cool, and no error codes may even appear since the board itself loses power.

  • Specs: Input 208/240V | Output 24V | 40VA power rating | 50/60Hz | Factory OEM part number HT01BD209 | Carrier-matched construction and insulation class
  • OEM vs Generic: OEM transformers are wound and insulated to exact Carrier factory tolerances, ensuring stable 24V output under full-load conditions. Generic units may produce voltage sag under load, causing erratic contactor chatter, nuisance lockouts, or premature control board failure.
  • Install difficulty: 2/5 — Always disconnect power at the disconnect box before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter (to verify 24V output post-install), wire nuts or spade connectors. Photograph or label all low-voltage wiring before disconnecting the old transformer.
  • Warranty: 1-year OEM factory warranty against defects in materials and workmanship. In-stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier PY3PNA036090NA packaged unit. Verify input voltage on your unit's data plate (208V or 240V) before ordering. Not sure it fits? Our HVAC parts specialists confirm fitment before you buy — order with confidence and get back to comfort fast.

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

Frequently Asked Questions

Does this Transformer fit my Carrier PY3PNA036090NA?
Yes. This is the factory-specified OEM transformer for the Carrier PY3PNA036090NA. 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 PY3PNA036090NA?
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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Mike Rivera
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