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OEM Payne Transformer 40VA 120V-24V for PA3ZNB048000AC
Payne

OEM Payne Transformer 40VA 120V-24V for PA3ZNB048000AC

SKU: PAYNE-PA3ZNB048000AC-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 Transformer 40VA 120V/24V for Model PA3ZNB048000AC

This is the factory OEM replacement transformer (part# HT01BD209) for the Payne PA3ZNB048000AC packaged air conditioning unit. The control transformer steps down line voltage from 120V to 24V to power the low-voltage control circuit — including the thermostat, contactor coil, and control board. When the transformer fails, the entire control circuit goes dead: the thermostat goes blank, the system won't respond to any calls for cooling or heating, and nothing operates. A failed transformer is often caused by a shorted control wire, a failed component drawing excess current, or simply age and heat fatigue.

  • Specs: Input 120V | Output 24V | 40VA rating | OEM part number HT01BD209 | Direct factory-matched replacement for Payne PA3ZNB048000AC
  • OEM vs Generic: This OEM transformer is wound to exact factory VA and voltage specifications. Generic units may run under-rated VA loads, causing premature burnout — especially in multi-stage or communicating systems that draw higher control-circuit current.
  • Install Difficulty: 2/5 — Shut off all power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label or photograph all low-voltage wiring connections before disconnecting. Verify incoming line voltage before energizing.
  • Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed specifically for the Payne PA3ZNB048000AC 4-ton packaged unit. Always verify transformer VA rating and primary/secondary voltages on your unit's wiring diagram before ordering. Our parts specialists are available to confirm fitment — order with confidence today.

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 PA3ZNB048000AC?
Yes. This is the factory-specified OEM transformer for the Payne PA3ZNB048000AC. 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 PA3ZNB048000AC?
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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