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OEM Payne Transformer 40VA 120V/24V for PA4ZNA036000AA
Payne

OEM Payne Transformer 40VA 120V/24V for PA4ZNA036000AA

SKU: PAYNE-PA4ZNA036000AA-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 PA4ZNA036000AA

This OEM replacement transformer (part# HT01BD209) is the factory-specified control transformer for the Payne PA4ZNA036000AA split-system air conditioner. The transformer steps down 120V line voltage to 24V AC to power the control board, thermostat, contactor coil, and all low-voltage safety circuits. When this part fails, the entire control circuit goes dead — the thermostat goes blank, the system won't respond to calls for cooling or heating, and no safety outputs are triggered. It is often the first component to inspect when nothing in the system responds at all.

  • Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01BD209 | Direct drop-in fitment for PA4ZNA036000AA
  • OEM vs Generic: This factory OEM transformer is wound and insulated to Payne's exact VA and voltage specifications. Generic transformers may be under-rated in VA output, causing overheating, nuisance tripping, or premature failure — especially when multiple 24V accessories are connected.
  • Install difficulty: 2/5 — Shut off all power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Label and photograph all low-voltage wiring connections before removal. Verify 24V output with a multimeter after installation before restoring full 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 specifically for the Payne PA4ZNA036000AA (3-ton) split-system condenser. Always verify your existing transformer's VA rating and primary/secondary voltage from your unit's data plate or wiring diagram before ordering to ensure a proper match. Our parts specialists are available to confirm fitment before you buy — no guesswork required.

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 PA4ZNA036000AA?
Yes. This is the factory-specified OEM transformer for the Payne PA4ZNA036000AA. 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 PA4ZNA036000AA?
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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