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OEM Carrier Furnace Transformer 120V–24V 40VA for PG8MAA066110AAJA
Carrier

OEM Carrier Furnace Transformer 120V–24V 40VA for PG8MAA066110AAJA

SKU: CARRIE-PG8MAA066110AAJA-TRANSFORMER-HT01BC116 Brand: Carrier
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OEM Carrier Furnace Transformer 120V–24V 40VA for Model PG8MAA066110AAJA

This OEM step-down transformer is the factory-specified replacement for the Carrier PG8MAA066110AAJA gas furnace. The transformer converts 120V line voltage down to 24V AC to power the low-voltage control circuit — including the thermostat, control board, gas valve, and all 24V safety switches. When this transformer fails, the entire control circuit goes dead: the thermostat goes blank, the furnace won't respond to calls for heat, and the control board shows no activity. It is one of the first components to check when a furnace is completely unresponsive.

  • Specs: 120V primary | 24V secondary | 40VA rating | 60Hz single-phase | Foot-mount configuration | Wire lead connections with insulated female quick-connects
  • OEM Part Numbers: Replaces HT01BC116 (original) and current OEM successor HT680054. Cross-references: HT01BC115, HT01BB126, HT01CT120, HT01BC120, HT01AW115, B1810113, 322666-701
  • OEM vs Generic: This OEM unit is factory-matched to Carrier's exact VA rating and mounting footprint. Generic transformers are often undersized in VA capacity or mount incorrectly, risking overload, nuisance tripping of the furnace's internal fuse, or shortened service life.
  • Install difficulty: 2/5 — Shut off power to the furnace at the disconnect switch before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Photograph all low-voltage wiring before disconnecting. Check and replace the low-voltage fuse on the control board at the same time — a shorted thermostat wire is the most common cause of transformer failure.
  • Warranty: 1-year OEM manufacturer's warranty. In stock — ships same business day from our warehouse.

Compatibility: Engineered for the Carrier PG8MAA066110AAJA gas furnace. Also compatible with a wide range of Carrier, Bryant, and Payne furnaces requiring a 120V–24V 40VA foot-mount transformer. Verify your unit's control voltage and VA requirements on the data label inside the furnace cabinet before ordering. Have questions? 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 PG8MAA066110AAJA?
Yes. This is the factory-specified OEM transformer for the Carrier PG8MAA066110AAJA. 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 PG8MAA066110AAJA?
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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