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OEM Carrier Transformer 120V–24V 40VA for PY3GEAA36090AA
Carrier

OEM Carrier Transformer 120V–24V 40VA for PY3GEAA36090AA

SKU: CARRIE-PY3GEAA36090AA-TRANSFORMER-HT01BC701 Brand: Carrier
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Texas CMBL #19328542014
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OEM Carrier Transformer 120V–24V 40VA for Model PY3GEAA36090AA

This OEM replacement transformer (part number HT01BC701) is the factory-specified control circuit transformer for the Carrier PY3GEAA36090AA packaged unit. The transformer steps down 120V line voltage to the 24V signal voltage that powers your thermostat, control board, and all low-voltage switching components. When the transformer fails, the entire control circuit goes dark — your thermostat becomes unresponsive, contactors won't energize, and the system produces no heating or cooling whatsoever. It is one of the most overlooked yet most critical components in the unit.

  • Specs: Primary voltage: 120V AC | Secondary voltage: 24V AC | VA rating: 40VA | Factory-matched OEM tolerances | Includes integral secondary circuit protection
  • OEM vs Generic: This OEM Carrier part (HT01BC701) is wound to exact factory VA and voltage tolerances. Generic transformers may run under-rated VA, causing overheating, nuisance tripping, or premature failure of downstream control boards.
  • Install difficulty: 2/5 — Disconnect all power at the disconnect box and verify zero voltage with a multimeter before handling. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter, wire nuts or fork terminals. Always label low-voltage wiring (R, C, G, W, Y) before disconnecting the old unit.
  • Warranty: 1-year OEM factory warranty against defects in materials and workmanship. Orders placed before 3 PM local time ship same business day from our warehouse.

Compatibility: Engineered as a direct OEM replacement for the Carrier PY3GEAA36090AA packaged unit. Confirm your unit's data plate shows a 120V primary / 24V secondary control transformer before ordering. Not sure if this fits? Our HVAC parts specialists verify fitment before you buy — contact us anytime.

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 PY3GEAA36090AA?
Yes. This is the factory-specified OEM transformer for the Carrier PY3GEAA36090AA. 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 PY3GEAA36090AA?
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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