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OEM Carrier Furnace Transformer 120V–24V 40VA — PG8MAA036045ADJA
Carrier

OEM Carrier Furnace Transformer 120V–24V 40VA — PG8MAA036045ADJA

SKU: CARRIE-PG8MAA036045ADJA-TRANSFORMER-HT01BC116 Brand: Carrier
✓ Guaranteed to fit PG8MAA036045ADJA — or your money back. Terms

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Texas CMBL #19328542014
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OEM Carrier Furnace Control Transformer 120V–24V 40VA for Model PG8MAA036045ADJA

This OEM control transformer (part number HT01BC116, updated to HT680054) is the factory-specified replacement for the Carrier PG8MAA036045ADJA gas furnace. The transformer steps down 120V line voltage to 24V AC, powering every low-voltage component in the system — thermostat, gas valve, inducer relay, and control board. When it fails, the furnace goes completely dark: no thermostat response, no ignition attempt, and no fan operation. A failed transformer is one of the most common causes of a completely unresponsive furnace.

  • Specs: Input 120V AC | Output 24V AC | 40VA rating | Foot-mount configuration | Wire lead connections | 60 Hz
  • OEM vs Generic: OEM transformers are wound to exact Carrier factory tolerances, ensuring stable 24V output under full load. Generic units often undervolt the control circuit, causing random lockouts, false pressure switch trips, and premature control board failure.
  • Install Difficulty: 2/5 — Shut off power at the breaker and confirm zero voltage before proceeding. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Label or photograph all wire connections before removing the old transformer. Verify 24V output at the R and C terminals after installation.
  • Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Fits Carrier model PG8MAA036045ADJA gas furnace. Note: OEM part number HT01BC116 has been superseded by HT680054 — both are the same 120V–24V 40VA transformer and are fully interchangeable. Always verify input voltage and VA rating on your unit's data plate before ordering. Our team is happy to confirm fitment 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 — PG8MAA036045ADJA?
Yes. This is the factory-specified OEM transformer for the Carrier OEM Carrier Furnace Transformer 120V–24V 40VA — PG8MAA036045ADJA. 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 — PG8MAA036045ADJA?
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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