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OEM Carrier Control Transformer 40VA 208/230V for PY3PNA036090NB
Carrier

OEM Carrier Control Transformer 40VA 208/230V for PY3PNA036090NB

SKU: CARRIE-PY3PNA036090NB-TRANSFORMER-HT01BD209 Brand: Carrier
✓ Guaranteed to fit PY3PNA036090NB — or your money back. Terms

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Texas CMBL #19328542014
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OEM Carrier Control Transformer 40VA 208/230V to 24V — HT01BD209 for Model PY3PNA036090NB

The Carrier HT01BD209 is the factory-specified OEM control transformer for the PY3PNA036090NB packaged unit. This transformer steps down 208/230V line voltage to the 24V signal voltage that powers your thermostat, control board, and all low-voltage safety circuits. When it fails, the result is immediate and total: the thermostat goes dark, no call for heat or cooling is processed, and the system is completely unresponsive — often misdiagnosed as a control board failure.

  • Specs: 208/230V primary | 24V secondary | 40VA rating | 50/60 Hz | Class 2 control transformer | OEM part number HT01BD209 (replaces HT01BD207, HT01CN232, 9076-00)
  • OEM vs Generic: The OEM Carrier transformer is wound to exact VA and voltage tolerances required by the PY3PNA036090NB control circuit. Undersized or off-tolerance generic transformers can cause nuisance lockouts, brownout trips on the secondary side, and premature control board failure.
  • Install difficulty: 2/5 — Always disconnect power and verify zero voltage at the unit before beginning. Tools needed: multimeter, flathead and Phillips screwdrivers, wire nuts or spade terminals. Label all low-voltage wires before disconnecting. Confirm 24V output with a multimeter after installation before restoring full power.
  • Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier PY3PNA036090NB packaged unit. Also cross-references to Bryant and Payne models using the same control transformer specification. Verify your existing transformer's VA rating and primary voltage on the unit data plate before ordering. Need help confirming fitment? Our HVAC parts specialists verify compatibility before you buy — no guesswork.

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 PY3PNA036090NB?
Yes. This is the factory-specified OEM transformer for the Carrier PY3PNA036090NB. 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 PY3PNA036090NB?
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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