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OEM Payne Transformer 40VA 120V/24V for PA1SPA120000AAAA
Payne

OEM Payne Transformer 40VA 120V/24V for PA1SPA120000AAAA

SKU: PAYNE-PA1SPA120000AAAA-TRANSFORMER-HT01BD236 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 Control Transformer 40VA for Model PA1SPA120000AAAA

This OEM replacement transformer (part number HT01BD236) is the factory-specified step-down transformer for the Payne PA1SPA120000AAAA air handler or packaged unit. Its sole but critical job is to convert 120V line voltage down to 24V AC, powering the entire low-voltage control circuit — thermostat, control board, contactor coil, and zone valves. When this transformer fails, nothing works: the thermostat goes blank, the system won't respond to any call for heating or cooling, and you may detect a burning smell near the air handler cabinet.

  • Specs: 40VA rating | 120V primary / 24V secondary | Class 2 transformer | Direct OEM replacement for part number HT01BD236
  • OEM vs Generic: OEM transformers are wound and insulated to Payne's exact VA and thermal specifications. Undersized or off-brand units can overheat under control circuit load, causing repeated failures and potential board damage.
  • Install difficulty: 2/5 — Always disconnect power at the breaker before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to confirm 24V output after install). Note wire colors and terminal labels before removing the old transformer.
  • Warranty: 1-year OEM factory warranty. In-stock units ship the same business day from our climate-controlled warehouse.

Compatibility: Designed specifically for the Payne PA1SPA120000AAAA. Verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate or wiring diagram before ordering. If your control circuit is blowing the transformer fuse repeatedly, inspect for a shorted wire or failed board before replacing. Our fitment team is available to confirm compatibility before you order — same-day shipping available on all in-stock parts.

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 PA1SPA120000AAAA?
Yes. This is the factory-specified OEM transformer for the Payne PA1SPA120000AAAA. 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 PA1SPA120000AAAA?
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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