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OEM Carrier Furnace Transformer 120V-24V 40VA — PG8JAA042090ADJA
Carrier

OEM Carrier Furnace Transformer 120V-24V 40VA — PG8JAA042090ADJA

SKU: CARRIE-PG8JAA042090ADJA-TRANSFORMER-HT01BC116 Brand: Carrier
✓ Guaranteed to fit PG8JAA042090ADJA — or your money back. Terms

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OEM Carrier Furnace Control Transformer 120V–24V 40VA for Model PG8JAA042090ADJA

This is the OEM factory-specified control transformer for the Carrier PG8JAA042090ADJA gas furnace, referenced under part number HT01BC116. The transformer is the backbone of your furnace's low-voltage control circuit — it steps down 120V line voltage to the 24V signal that powers your thermostat, gas valve, inducer relay, and control board. When this transformer fails, the entire control circuit goes dark: you'll see a completely unresponsive furnace with no thermostat display, no inducer startup, and no fault codes. A failed transformer is often confirmed with a multimeter — zero volts on the secondary side (24V terminals) with power present on the primary side (120V) means replacement is needed immediately.

  • Specs: Primary Voltage: 120V | Secondary Voltage: 24V | VA Rating: 40VA | Class 2 step-down transformer | Wire lead connections | Factory-matched to Carrier PG8JAA042090ADJA
  • OEM vs Generic: OEM transformers are wound and tested to exact Carrier specifications. Generic units often use thinner gauge windings that overheat under sustained load, causing premature failure and potentially damaging downstream components like the control board or gas valve.
  • Install Difficulty: 2/5 — Shut off power at the breaker before beginning. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Photograph all wire connections before removing old transformer. Confirm 24V output after installation before closing the furnace cabinet.
  • Warranty: 1-year OEM manufacturer warranty. In-stock and ships same business day from our warehouse.

Compatibility: Designed as the direct OEM replacement for Carrier model PG8JAA042090ADJA gas furnaces. Note: HT01BC116 has been superseded — our listing supplies the current authorized OEM replacement (HT680054) which is a direct drop-in at the same 120V/24V/40VA spec. Verify your existing transformer's primary voltage and VA rating on its label before ordering. Questions about fitment? Our HVAC parts specialists confirm compatibility 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 Furnace Transformer 120V-24V 40VA — PG8JAA042090ADJA?
Yes. This is the factory-specified OEM transformer for the Carrier OEM Carrier Furnace Transformer 120V-24V 40VA — PG8JAA042090ADJA. 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 — PG8JAA042090ADJA?
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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