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OEM Carrier Transformer 40VA 208/240V–24V for PY3PNA042060NB
Carrier

OEM Carrier Transformer 40VA 208/240V–24V for PY3PNA042060NB

SKU: CARRIE-PY3PNA042060NB-TRANSFORMER-HT01BD209 Brand: Carrier
✓ Guaranteed to fit PY3PNA042060NB — or your money back. Terms

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Texas CMBL #19328542014
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OEM Carrier 40VA Control Transformer HT01BD209 for Model PY3PNA042060NB

This OEM Carrier control transformer (part #HT01BD209) is the factory-specified replacement for the Carrier PY3PNA042060NB packaged HVAC unit. The transformer steps down line voltage from 208/240V to 24V AC to power the entire low-voltage control circuit — including the thermostat, contactor coil, and control board. When the transformer fails, the system goes completely silent: the thermostat goes blank, no calls for heating or cooling are answered, and nothing responds. In many cases, a failed transformer is caused by a short or overload downstream in the 24V circuit, so always inspect the full control wiring before replacing.

  • Specs: Input voltage 208/240V | Output voltage 24V | Frequency 50/60Hz | Power rating 40VA | OEM part #HT01BD209
  • OEM vs Generic: This is a genuine Carrier OEM transformer built to exact factory VA and voltage tolerances. Generic transformers can run under-rated VA capacity, causing premature burnout and nuisance tripping of downstream fuses.
  • Install difficulty: 2/5 — Shut off power at the breaker and verify voltage is absent before touching wiring. Tools needed: flathead and Phillips screwdrivers, multimeter, wire stripper. Always label and photograph existing wire connections before disconnecting. Check for downstream 24V shorts before energizing.
  • Warranty: 1-year OEM factory warranty. In stock — ships same business day from our warehouse.

Compatibility: Designed as a direct OEM replacement for Carrier model PY3PNA042060NB packaged HVAC systems. Verify your unit's data plate shows a 208/240V primary and 24V secondary control circuit before ordering. Our fitment team is available to confirm compatibility before you buy — order with confidence and get back up and running 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 $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 PY3PNA042060NB?
Yes. This is the factory-specified OEM transformer for the Carrier PY3PNA042060NB. 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 PY3PNA042060NB?
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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