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OEM Carrier 40VA Transformer HT01BC116 for PG8UAA042091AAJA
Carrier

OEM Carrier 40VA Transformer HT01BC116 for PG8UAA042091AAJA

SKU: CARRIE-PG8UAA042091AAJA-TRANSFORMER-HT01BC116 Brand: Carrier
✓ Guaranteed to fit PG8UAA042091AAJA — or your money back. Terms

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Texas CMBL #19328542014
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Govt POs Accepted

OEM Carrier 40VA Control Transformer HT01BC116 for Model PG8UAA042091AAJA

This OEM replacement control transformer (part# HT01BC116) is the factory-specified unit for the Carrier PG8UAA042091AAJA gas furnace. The transformer steps down 120V line voltage to the 24V AC signal that powers your thermostat circuit, control board, gas valve, and all low-voltage safety controls. When it fails, the entire control circuit goes dark — nothing responds, no heat is called, and the system appears completely dead. A blown fuse on the transformer secondary side is often the first symptom before full failure.

  • Specs: 40VA rating | 120V primary / 24V secondary | OEM factory-matched output tolerance | Replaces OEM part number HT01BC116
  • OEM vs Generic: OEM transformers are wound and potted to Carrier's exact VA and impedance spec. Under-rated generic units overheat under full 24V load (gas valve + board + thermostat simultaneously), leading to premature failure or nuisance fuse trips.
  • Install difficulty: 2/5 — Shut off power at the disconnect before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter to confirm 24V output after install. Label all wiring before disconnecting. Always replace the control board fuse if it was blown prior to transformer failure.
  • Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Engineered specifically for the Carrier PG8UAA042091AAJA packaged gas furnace. Always verify your existing transformer's VA rating and primary/secondary voltages against your unit's data plate before ordering. Need help confirming fitment? Our HVAC parts team is ready to verify compatibility before you 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 PG8UAA042091AAJA?
Yes. This is the factory-specified OEM transformer for the Carrier PG8UAA042091AAJA. 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 PG8UAA042091AAJA?
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