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OEM Payne Transformer 40VA 120V/24V for PA3ZNA030000AA
Payne

OEM Payne Transformer 40VA 120V/24V for PA3ZNA030000AA

SKU: PAYNE-PA3ZNA030000AA-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 40VA Control Transformer for Model PA3ZNA030000AA

This OEM control transformer (part number HT01BD209) is the factory-specified replacement for the Payne PA3ZNA030000AA system. The transformer steps down 120V line voltage to the 24V signal required by your thermostat, control board, contactor coil, and all other low-voltage components. When it fails, nothing in the control circuit responds — the thermostat goes blank, the system won't call for heating or cooling, and you may find a blown 3A fuse on the board as a telltale sign of a shorted secondary winding.

  • Specs: 40VA rating | 120V primary / 24V secondary | Class 2 transformer | OEM part number HT01BD209 | Factory-matched for Payne PA3ZNA030000AA
  • OEM vs Generic: This is the exact factory unit — same VA rating, same terminal configuration, and same insulation class as the original. Generic transformers often run under-rated VA, causing premature thermal cutout trips and repeat failures under full control-circuit load.
  • Install difficulty: 2/5 — Disconnect power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Label all wires before disconnecting. The transformer mounts to the cabinet with one or two screws and uses push-on or screw terminals.
  • Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed and tested for the Payne PA3ZNA030000AA. Always verify your existing transformer's VA rating and primary/secondary voltage on the data plate or original unit label before ordering to confirm fitment. Our HVAC parts specialists are available to verify compatibility before you buy — no guesswork, no return hassle.

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 PA3ZNA030000AA?
Yes. This is the factory-specified OEM transformer for the Payne PA3ZNA030000AA. 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 PA3ZNA030000AA?
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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