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OEM Carrier Control Transformer 120V-24V 40VA — PG9MAB048100AASA
Carrier

OEM Carrier Control Transformer 120V-24V 40VA — PG9MAB048100AASA

SKU: CARRIE-PG9MAB048100AASA-TRANSFORMER-HT01BC116 Brand: Carrier
✓ Guaranteed to fit PG9MAB048100AASA — or your money back. Terms

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OEM Carrier Control Transformer 120V–24V 40VA for Model PG9MAB048100AASA (HT01BC116 / HT680054)

This OEM step-down control transformer is the factory-specified replacement for the Carrier PG9MAB048100AASA gas furnace. The transformer converts 120V line voltage down to 24V AC to power all low-voltage control circuit components — including the thermostat, gas valve, inducer relay, and IFC control board. When this transformer fails, the entire control circuit goes dead: the thermostat shows no response, the furnace will not initiate a heating cycle, and nothing happens when the system calls for heat. Note: OEM part number HT01BC116 has been superseded by HT680054, the current factory-authorized direct replacement.

  • Specs: Primary Voltage: 120V AC | Secondary Voltage: 24V AC | VA Rating: 40VA | Frequency: 60 Hz | Single Phase | Foot-mount configuration with wire lead connections
  • OEM vs Generic: This OEM transformer is wound to exact factory VA tolerances. Undersized or off-tolerance generic transformers overheat under full low-voltage load, tripping thermal cutoffs and causing intermittent lockouts — a common callback nightmare for technicians.
  • Install Difficulty: 2/5 — Shut off power at the breaker and disconnect the furnace before touching any wiring. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (verify 0V before handling). Photograph all wire connections before removal. Match wire leads carefully: primary (120V) and secondary (24V) sides are both present.
  • Warranty: 1-year OEM manufacturer warranty. Ships same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Direct OEM replacement for Carrier model PG9MAB048100AASA gas furnaces. Supersedes legacy part number HT01BC116; current shipping part is HT680054. Also replaces HT01BC115, HT01BB126, HT01CT120, HT01BC120, and several other Carrier/Bryant/Payne cross-references. Verify your unit's data plate voltage requirements before ordering. Our fitment team is available to confirm compatibility — just reach out before you buy.

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 Control Transformer 120V-24V 40VA — PG9MAB048100AASA?
Yes. This is the factory-specified OEM transformer for the Carrier OEM Carrier Control Transformer 120V-24V 40VA — PG9MAB048100AASA. 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 Control Transformer 120V-24V 40VA — PG9MAB048100AASA?
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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