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OEM Carrier Furnace Transformer 40VA 120V-24V — PG8JAA048135AAJA
Carrier

OEM Carrier Furnace Transformer 40VA 120V-24V — PG8JAA048135AAJA

SKU: CARRIE-PG8JAA048135AAJA-TRANSFORMER-HT01BC116 Brand: Carrier
✓ Guaranteed to fit PG8JAA048135AAJA — or your money back. Terms

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Texas CMBL #19328542014
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OEM Carrier Furnace Control Transformer 40VA 120V-24V for Model PG8JAA048135AAJA

This OEM step-down transformer is the factory-specified replacement for the Carrier PG8JAA048135AAJA gas furnace. It converts 120V line voltage down to 24V AC to power the low-voltage control circuit — including the thermostat, control board, gas valve, and inducer relay. When this transformer fails, absolutely nothing in the furnace will respond: no ignition attempt, no error codes, no thermostat communication. It is one of the first components to test whenever a furnace appears completely dead.

  • Specs: 40VA rating | 120V primary | 24V secondary | 60 Hz single-phase | Foot-mount configuration | Wire lead connection type with insulated female quick-connect terminals
  • OEM vs Generic: This is a genuine OEM Carrier transformer (superseded part HT680054, direct replacement for HT01BC116) shipped in factory-authorized packaging. OEM units are wound to exact VA and voltage tolerances. Generic transformers often run hot under load and can damage sensitive control boards over time.
  • Install difficulty: 2/5 — Shut off power at the breaker and verify zero voltage before touching any wiring. Tools needed: flathead and Phillips screwdrivers, multimeter, needle-nose pliers. Photograph all wire connections before disconnecting the old unit. Verify 24V output at the R and C terminals on the control board after installation.
  • Warranty: 1-year OEM manufacturer warranty. In-stock units ship same business day from our warehouse when ordered by 5 PM local time.

Compatibility: Engineered as a direct OEM replacement for Carrier model PG8JAA048135AAJA. This transformer also supersedes legacy part numbers HT01BC116, HT01BC115, HT01BB126, HT01CT120, HT01BC120, HT01AW115, and several others — making it a broad-coverage OEM solution for Carrier, Bryant, and Payne furnaces sharing this control circuit specification. Confirm your unit's data plate shows a 120V primary / 24V secondary transformer requirement before ordering. Not sure? Our team verifies fitment before you buy — reach out before placing your order.

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 40VA 120V-24V — PG8JAA048135AAJA?
Yes. This is the factory-specified OEM transformer for the Carrier OEM Carrier Furnace Transformer 40VA 120V-24V — PG8JAA048135AAJA. 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 40VA 120V-24V — PG8JAA048135AAJA?
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
HVAC Parts Specialist — Online