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OEM Payne Transformer 40VA 120V-24V for PA3ZNB048000AB
Payne

OEM Payne Transformer 40VA 120V-24V for PA3ZNB048000AB

SKU: PAYNE-PA3ZNB048000AB-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 to 24V Control Circuit for PA3ZNB048000AB

This is the factory OEM replacement transformer (part number HT01BD209) for the Payne PA3ZNB048000AB packaged air conditioning unit. The transformer steps down 120V line voltage to the 24V AC signal that powers your thermostat, control board, contactor coil, and all low-voltage control wiring. When the transformer fails — due to a wiring short, voltage spike, or simply age — nothing in the system responds: the thermostat goes blank, the unit won't start, and no fault codes are generated because the control board itself has lost power.

  • Specs: 40VA rated | 120V primary / 24V secondary | Compatible with standard 24V control circuits | Factory-matched to Payne PA3ZNB048000AB specifications | OEM part number HT01BD209
  • OEM vs Generic: This OEM unit is wound to exact VA and voltage tolerances for the PA3ZNB048000AB. Undersized or off-tolerance generic transformers risk nuisance tripping, control board brownouts, and premature failure — especially if your system runs multiple 24V accessories like humidistats or zone boards.
  • Install difficulty: 2/5 — Disconnect power at the disconnect box and verify zero voltage before beginning. Tools needed: flathead and Phillips screwdrivers, wire nuts or terminal connectors, multimeter. Label all low-voltage wires before removing the old transformer. Confirm primary and secondary lead polarity before energizing.
  • Warranty: 1-year OEM factory warranty. Orders placed before cutoff ship same business day from our stocked warehouse.

Compatibility: Designed specifically for the Payne PA3ZNB048000AB packaged unit. Verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate or wiring diagram before ordering. If you're unsure of fitment, our HVAC parts specialists will confirm compatibility before your order ships — 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 PA3ZNB048000AB?
Yes. This is the factory-specified OEM transformer for the Payne PA3ZNB048000AB. 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 PA3ZNB048000AB?
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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