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OEM Carrier Furnace Transformer 120V-24V 40VA — PG9MAB048080AASA
Carrier

OEM Carrier Furnace Transformer 120V-24V 40VA — PG9MAB048080AASA

SKU: CARRIE-PG9MAB048080AASA-TRANSFORMER-HT01BC116 Brand: Carrier
✓ Guaranteed to fit PG9MAB048080AASA — or your money back. Terms

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OEM Carrier Furnace Transformer 120V–24V 40VA for Model PG9MAB048080AASA (HT01BC116 / HT680054)

This OEM step-down transformer is the factory-specified replacement for the Carrier PG9MAB048080AASA gas furnace. It converts 120V AC line voltage down to 24V AC to power the furnace's entire low-voltage control circuit — including the thermostat, control board, gas valve, and ignition system. When the transformer fails, the furnace goes completely silent: no inducer, no spark, no heat. If you're reading 0V between the R and C terminals on your control board, a failed transformer is the first thing to rule out.

  • Specs: Input Voltage: 120V AC | Output Voltage: 24V AC | VA Rating: 40VA | Frequency: 60Hz | Connection: Wire leads with foot mount | Includes integrated 3A fuse protection
  • OEM vs Generic: This OEM unit is wound to exact factory VA and voltage tolerances. Generic transformers frequently run off-spec voltage output, causing nuisance lockouts, erratic thermostat behavior, and premature control board failure — a far more expensive repair.
  • Install Difficulty: 2/5 — Shut off power at the breaker before starting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Label or photograph all wire connections before disconnecting the old unit. Verify 24V output at R–C terminals after installation to confirm correct operation.
  • Warranty: 1-year OEM manufacturer warranty. Ships same business day from our stocked warehouse.

Compatibility Note: Designed for Carrier model PG9MAB048080AASA gas furnaces. OEM part number HT01BC116 has been superseded by HT680054 — both are the same factory-spec 120V–24V 40VA unit. Also cross-references: HT01BC115, HT01BB126, HT01BC120, HT01AW115, and 322666-701. Confirm your unit's control voltage on the data plate before ordering. Our fitment team is available to verify compatibility prior to purchase.

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 OEM Carrier Furnace Transformer 120V-24V 40VA — PG9MAB048080AASA?
Yes. This is the factory-specified OEM transformer for the Carrier OEM Carrier Furnace Transformer 120V-24V 40VA — PG9MAB048080AASA. 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 OEM Carrier Furnace Transformer 120V-24V 40VA — PG9MAB048080AASA?
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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