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OEM Carrier Transformer 40VA 120V-24V for PG8UAA042091ACJA
Carrier

OEM Carrier Transformer 40VA 120V-24V for PG8UAA042091ACJA

SKU: CARRIE-PG8UAA042091ACJA-TRANSFORMER-HT01BC116 Brand: Carrier
✓ Guaranteed to fit PG8UAA042091ACJA — or your money back. Terms

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Texas CMBL #19328542014
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OEM Carrier 40VA 120V–24V Step-Down Transformer HT01BC116 for Model PG8UAA042091ACJA

This is the factory OEM step-down transformer for the Carrier PG8UAA042091ACJA gas furnace, sold under OEM part number HT01BC116 (superseded by HT680054). The transformer converts 120V line voltage to 24V AC to power all low-voltage control circuit components — including the thermostat, gas valve, inducer relay, and control board. When this transformer fails, the furnace loses all 24V control signal: the thermostat goes blank, the system won't call for heat, and no safety functions respond. It's one of the first components to check when you have a completely unresponsive furnace.

  • Specs: 40VA rating | 120V primary | 24V secondary | 60 Hz single-phase | Foot-mount style | Wire lead connections with insulated female quick-connects
  • OEM vs Generic: This OEM-spec unit is factory-matched to the control board's load requirements. Generic transformers frequently run undersized VA tolerance or use inferior core materials, leading to overheating, voltage sag, and premature failure — particularly when the furnace is paired with a central AC system sharing the same 24V circuit.
  • Install difficulty: 2/5 — Disconnect power at the breaker and verify 0V before touching any wiring. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter (to verify 24V output post-install). Photograph all wire connections before disconnecting. Check between the C and R terminals on the control board after installation to confirm 24V output.
  • Warranty: 1-year OEM manufacturer warranty. In-stock units ship same business day from our warehouse.

Compatibility: Designed as the direct OEM replacement for Carrier model PG8UAA042091ACJA gas furnaces. Note: OEM part number HT01BC116 has been factory-superseded by HT680054 — both are genuine Carrier authorized parts and direct drop-in replacements. Also replaces HT01BC115, HT01BB126, HT01CT120, HT01BC120, and related cross-reference numbers. Confirm your unit's control voltage requirement on the data plate before ordering. Our team is happy to verify fitment — 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 PG8UAA042091ACJA?
Yes. This is the factory-specified OEM transformer for the Carrier PG8UAA042091ACJA. 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 PG8UAA042091ACJA?
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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