Same-day shipping before 3PM CST · 35,000+ OEM Parts · Texas CMBL & SAM.gov Registered · Government POs Accepted

Menu

Home Shop All Account Cart
OEM Carrier Transformer 40VA 208/240V–24V for PY3GNA036090NA
Carrier

OEM Carrier Transformer 40VA 208/240V–24V for PY3GNA036090NA

SKU: CARRIE-PY3GNA036090NA-TRANSFORMER-HT01BD209 Brand: Carrier
✓ Guaranteed to fit PY3GNA036090NA — or your money back. Terms

OEM Guaranteed

Same-Day Ship

30-Day Returns

Secure Checkout

Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

OEM Carrier 40VA Control Transformer 208/240V to 24V for Model PY3GNA036090NA

This OEM Carrier transformer (part #HT01BD209) is the factory-specified replacement for the Carrier PY3GNA036090NA packaged unit. The control transformer steps down 208/240V line voltage to the 24V signal required to power your thermostat, control board, relays, and all low-voltage safety circuits. When this transformer fails, the entire control circuit goes dark — no thermostat response, no ignition sequence, no fan operation. It is often the first component to suspect when a unit appears completely unresponsive despite confirmed line voltage at the unit.

  • Specs: 40VA power rating | 208/240V primary input | 24V secondary output | 50/60Hz rated | Direct OEM factory replacement for part #HT01BD209
  • OEM vs Generic: OEM Carrier transformers are wound to exact VA and voltage tolerance specifications. Undersized or off-spec aftermarket units can starve the control board or fail prematurely under full circuit load, causing intermittent lockouts and difficult-to-diagnose callbacks.
  • Install difficulty: 2/5 — Shut off all power to the unit before beginning. Tools needed: multimeter (verify 0V before touching leads), flathead and Phillips screwdrivers, wire nuts or terminals. Label all 24V secondary wires before disconnecting. Confirm output voltage after installation before restoring full system power.
  • Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Factory-matched for Carrier model PY3GNA036090NA packaged unit. Verify your unit's data plate shows 208/240V line voltage before ordering — units wired for 120V primary require a different transformer. Need help confirming fitment? Our HVAC parts specialists verify compatibility before you order. Order today for same-day shipping.

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 PY3GNA036090NA?
Yes. This is the factory-specified OEM transformer for the Carrier PY3GNA036090NA. 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 PY3GNA036090NA?
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.
Home Shop Search Account Cart
Fitment Guaranteed
MR
Mike Rivera
HVAC Parts Specialist — Online