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OEM Carrier Control Transformer 40VA 208/240V-24V — PY3PNA048090AA
Carrier

OEM Carrier Control Transformer 40VA 208/240V-24V — PY3PNA048090AA

SKU: CARRIE-PY3PNA048090AA-TRANSFORMER-HT01BD209 Brand: Carrier
✓ Guaranteed to fit PY3PNA048090AA — or your money back. Terms

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Texas CMBL #19328542014
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OEM Carrier Control Transformer 40VA 208/240V to 24V for Model PY3PNA048090AA

This is the genuine OEM Carrier control transformer (part #HT01BD209) factory-specified for the Carrier PY3PNA048090AA packaged unit. The transformer steps line voltage (208/240V) down to the 24V DC control circuit that powers your thermostat, contactor coil, gas valve, and all low-voltage components. When this transformer fails, nothing in the system responds — the thermostat goes blank, the unit won't energize, and you may detect a burning smell or a blown 3A fuse on the control board. Replacing this transformer is one of the fastest paths back to a fully operational system.

  • Specs: 40VA capacity | 208/240V primary input | 24V secondary output | 50/60 Hz | Approx. 1.3 lbs | Direct OEM replacement
  • OEM vs Generic: OEM transformers are wound and potted to exact factory tolerances, ensuring a stable 24V output under full load. Generic substitutes can sag under load, causing intermittent lockouts and premature control board failure.
  • Install Difficulty: 2/5 — Shut off all power at the breaker and verify zero voltage before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire labels. Photograph all wiring connections before disconnecting. Typical job time: 20–30 minutes.
  • Warranty & Shipping: 1-year OEM factory warranty. In stock — ships same business day from our warehouse. Free standard shipping available.

Compatibility: Factory-matched for Carrier model PY3PNA048090AA. Also replaces OEM part numbers HT01BD207, HT01CN232, and 9076-00. Confirm your unit's data plate voltage matches 208/240V primary before ordering. Our fitment team is available to verify compatibility prior to purchase.

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 $99
  • 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 info@nationalhvacparts.com to initiate a return
  • Refunds processed within 5-7 business days

Frequently Asked Questions

Does this Transformer fit my Carrier OEM Carrier Control Transformer 40VA 208/240V-24V — PY3PNA048090AA?
Yes. This is the factory-specified OEM transformer for the Carrier OEM Carrier Control Transformer 40VA 208/240V-24V — PY3PNA048090AA. 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 Carrier OEM Carrier Control Transformer 40VA 208/240V-24V — PY3PNA048090AA?
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 Carrier 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 Carrier 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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Mike Rivera
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