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 PY3PPA036090AA
Carrier

OEM Carrier Transformer 40VA 208/240V–24V for PY3PPA036090AA

SKU: CARRIE-PY3PPA036090AA-TRANSFORMER-HT01BD209 Brand: Carrier
✓ Guaranteed to fit PY3PPA036090AA — 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 — Model PY3PPA036090AA

This OEM Carrier transformer (part #HT01BD209) is the factory-specified control circuit transformer for the Carrier PY3PPA036090AA packaged unit. Its job is to step down line voltage — 208 or 240V — to the 24V signal voltage that powers your thermostat, control board, contactors, and every other low-voltage component in the system. When this transformer fails, the entire control circuit goes dead: your thermostat goes blank, the system won't respond to calls for heating or cooling, and no fault codes will appear because there's no power to generate them.

  • Specs: 208/240V primary input | 24V secondary output | 40VA power rating | 50/60 Hz | OEM part #HT01BD209 | Factory-matched electrical tolerances
  • OEM vs Generic: OEM transformers are wound to exact VA and voltage tolerances for your specific unit. Undersized or off-tolerance aftermarket units can sag under load, causing nuisance lockouts, erratic thermostat behavior, or premature contactor failure.
  • Install difficulty: 2/5 — Always shut off power at the disconnect and breaker before touching any wiring. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output after install). Photograph all wire connections before disconnecting the old transformer.
  • Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed as the direct OEM replacement for Carrier model PY3PPA036090AA. Always verify input voltage and VA rating on your unit's data plate before ordering. Our parts specialists are available to confirm fitment — order with confidence and get your system back online fast.

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 PY3PPA036090AA?
Yes. This is the factory-specified OEM transformer for the Carrier PY3PPA036090AA. 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 PY3PPA036090AA?
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