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 PY3GNAA60090NA
Carrier

OEM Carrier Transformer 40VA 208/240V–24V for PY3GNAA60090NA

SKU: CARRIE-PY3GNAA60090NA-TRANSFORMER-HT01BD209 Brand: Carrier
✓ Guaranteed to fit PY3GNAA60090NA — 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 Control Transformer 40VA 208/240V–24V for Model PY3GNAA60090NA

This OEM Carrier control transformer (part #HT01BD209) is the factory-specified replacement for the Carrier PY3GNAA60090NA. The transformer steps down 208/240V line voltage to the 24V signal used by your thermostat, control board, contactor coil, and every other low-voltage component in the system. When this part fails, the entire control circuit goes dark — nothing responds, including the thermostat, and the system will not run at all. If you have 240V at the disconnect but zero voltage at the 24V secondary terminals, this transformer is the most likely culprit.

  • Specs: 40VA capacity | 208/240V primary input | 24V secondary output | 50/60 Hz | Replaces HT01BD207, HT01CN232, and 9076-00
  • OEM vs Generic: OEM transformers are wound and rated to exact factory tolerances, protecting sensitive control boards from voltage spikes or brownouts. Generic units may under-deliver VA capacity under load, causing intermittent lockouts and premature board failure.
  • Install difficulty: 2/5 — Shut off power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or terminal connectors. Always verify 0V at primary terminals before touching wiring. Label all low-voltage wires before disconnecting.
  • Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse when ordered before cutoff.

Compatibility: Direct factory replacement for Carrier model PY3GNAA60090NA. Verify your existing transformer's primary voltage (208/240V) and VA rating (40VA) against your unit's data plate before ordering. Cross-references: HT01BD207, HT01CN232, 9076-00. Questions about fitment? Our HVAC parts specialists verify compatibility before every order — call or chat now.

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 PY3GNAA60090NA?
Yes. This is the factory-specified OEM transformer for the Carrier PY3GNAA60090NA. 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 PY3GNAA60090NA?
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