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OEM Payne Transformer 40VA 120V-24V for PA3GNA048000AA
Payne

OEM Payne Transformer 40VA 120V-24V for PA3GNA048000AA

SKU: PAYNE-PA3GNA048000AA-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 PA3GNA048000AA

This is the OEM factory-specified control transformer (part number HT01BD209) for the Payne PA3GNA048000AA packaged gas/electric unit. The transformer steps down 120V line voltage to the 24V signal used by your thermostat, contactor coil, gas valve, and control board. When it fails, the entire control circuit goes dead — the thermostat appears blank or unresponsive, and the system will not respond to any heating or cooling calls. It is one of the first components to check when absolutely nothing in the system responds.

  • Specs: 40VA rating | Primary: 120V | Secondary: 24V | OEM part number HT01BD209 | Factory-matched impedance and thermal protection
  • OEM vs Generic: OEM transformers include the correct VA rating and internal thermal fuse protection designed for this unit. Undersized or generic transformers can trip repeatedly under normal load, causing intermittent no-heat or no-cool conditions and potentially damaging downstream components.
  • Install Difficulty: 2/5 — Shut off all power to the unit before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label or photograph all wire connections before disconnecting. Verify 24V output at secondary terminals after installation before restoring full system power.
  • Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed as a direct OEM replacement for the Payne PA3GNA048000AA 4-ton packaged unit. Confirm your existing transformer's VA rating and primary/secondary voltages on the unit data plate or wiring diagram before ordering. Our fitment team is available to verify compatibility prior to purchase — same-day shipping available on all in-stock orders.

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 PA3GNA048000AA?
Yes. This is the factory-specified OEM transformer for the Payne PA3GNA048000AA. 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 PA3GNA048000AA?
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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