Same-day shipping before 3PM CST · 35,000+ OEM Parts · Texas CMBL & SAM.gov Registered · Government POs Accepted

Menu

Home Shop All Account Cart
OEM Carrier Furnace Transformer 120V-24V 40VA — HT01BC116
Carrier

OEM Carrier Furnace Transformer 120V-24V 40VA — HT01BC116

SKU: CARRIE-PG9MAA036040AAKA-TRANSFORMER-HT01BC116 Brand: Carrier
✓ Guaranteed to fit HT01BC116 — or your money back. Terms

OEM Guaranteed

Same-Day Ship

30-Day Returns

Secure Checkout

Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

OEM Carrier Furnace Control Transformer 120V–24V 40VA for Model PG9MAA036040AAKA

This OEM step-down control transformer is the factory-specified replacement for the Carrier PG9MAA036040AAKA gas furnace, sold under OEM part number HT01BC116 (superseded by HT680054). The transformer converts 120V line power down to 24V AC to energize the low-voltage control circuit — powering the thermostat, gas valve, inducer relay, and IFC control board. When this transformer fails, the entire control circuit goes dead: the thermostat displays nothing, the furnace refuses to respond to a heat call, and no ignition sequence is ever initiated. It is one of the first components to check during a no-power diagnostic.

  • Specs: Primary Voltage: 120V AC | Secondary Voltage: 24V AC | VA Rating: 40VA | Frequency: 60 Hz | Phase: Single | Mounting: Foot mount | Connection: Wire leads with insulated female quick-connects
  • OEM vs Generic: This OEM unit is wound to exact Carrier factory tolerances, ensuring stable 24V output under full load. Generic transformers frequently undervolt the control circuit under load, causing nuisance lockouts, erratic board behavior, and premature component wear.
  • Install difficulty: 2/5 — Turn off power at the breaker and verify 0V before touching any wiring. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Photograph all wire connections before removal. Check the low-voltage circuit for short conditions before energizing the new transformer.
  • Warranty: 1-year OEM manufacturer warranty. Ships same business day from our warehouse when ordered by 3 PM local time.

Compatibility: Designed for the Carrier PG9MAA036040AAKA gas furnace. OEM part number HT01BC116 has been superseded by HT680054 — both are covered by this listing. Also replaces HT01BC115, HT01BB126, HT01CT120, HT01BC120, HT01AW115, and several additional cross-reference numbers. Always confirm your unit's data plate voltage before ordering. Need fitment verification? Our HVAC parts team confirms compatibility before you buy — order now and get it shipped today.

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 — HT01BC116?
Yes. This is the factory-specified OEM transformer for the Carrier OEM Carrier Furnace Transformer 120V-24V 40VA — HT01BC116. 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 — HT01BC116?
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.
Home Shop Search Account Cart
Fitment Guaranteed
MR
Mike Rivera
HVAC Parts Specialist — Online