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OEM Payne Transformer 40VA 120V/24V for PA3ZNB036000AB
Payne

OEM Payne Transformer 40VA 120V/24V for PA3ZNB036000AB

SKU: PAYNE-PA3ZNB036000AB-TRANSFORMER-HT01BD209 Brand: Payne

Order before 3PM CST — ships same day.
Standard delivery 2-5 business days. Express options at checkout.

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OEM Payne Control Transformer 40VA for Model PA3ZNB036000AB

This OEM replacement transformer (part number HT01BD209) is the factory-specified unit for the Payne PA3ZNB036000AB split-system air conditioner. The transformer steps down 120V line voltage to the 24V AC signal that powers your thermostat, contactor coil, and all low-voltage control wiring. When it fails, the entire control circuit goes dead — the thermostat goes blank, the system won't respond to any call for cooling or heating, and no components will energize. A failed transformer is often misdiagnosed as a bad thermostat or control board, so always verify 24V output at the secondary terminals before replacing costlier components.

  • Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01BD209 | Factory-matched for Payne PA3ZNB036000AB control circuit requirements
  • OEM vs Generic: This OEM transformer is wound to exact VA and voltage tolerances required by the Payne factory control board. Generic transformers with undersized VA ratings can overheat under full control circuit load, tripping internal thermal protection and causing intermittent lockouts.
  • Install difficulty: 2/5 — Disconnect power at the breaker and verify zero voltage before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Label all low-voltage wires before disconnecting. Confirm 24V output at secondary terminals after installation before restoring full system power.
  • 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 Payne PA3ZNB036000AB (3-ton) split-system condenser. Verify your unit's data plate shows 120V primary control power and 24V secondary before ordering. Cross-reference OEM part number HT01BD209 for confirmed fitment. Need help verifying compatibility? Our HVAC parts specialists confirm fitment before you order — contact us before purchasing.

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 $75
  • 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 support@nationalhvacparts.com to initiate a return
  • Refunds processed within 5-7 business days

Frequently Asked Questions

Does this Transformer fit my Payne PA3ZNB036000AB?
Yes. This is the factory-specified OEM transformer for the Payne PA3ZNB036000AB. 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 Payne PA3ZNB036000AB?
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 Payne 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 Payne 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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