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 40VA Transformer HT01BC116 for PG8JAA042090AAJA
Carrier

OEM Carrier 40VA Transformer HT01BC116 for PG8JAA042090AAJA

SKU: CARRIE-PG8JAA042090AAJA-TRANSFORMER-HT01BC116 Brand: Carrier
✓ Guaranteed to fit PG8JAA042090AAJA — 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 40VA Control Transformer HT01BC116 for Model PG8JAA042090AAJA

This OEM step-down control transformer is the factory-specified replacement for the Carrier PG8JAA042090AAJA packaged gas furnace. The transformer steps line voltage down from 120V to 24V AC to power the low-voltage control circuit — including the thermostat, contactor coil, gas valve, and control board. When this component fails, the entire control circuit loses power: the thermostat goes blank, the unit will not respond to any call for heat or cool, and no other components will energize. A failed transformer often presents as a completely unresponsive system with no error codes, making it one of the most commonly overlooked diagnostics.

  • Specs: 40VA rating | 120V primary / 24V secondary | Class 2 control transformer | Factory-matched to Carrier PG8JAA042090AAJA wiring harness
  • OEM vs Generic: OEM transformers are wound to exact factory VA and voltage tolerances, protecting sensitive control boards from voltage fluctuations. Generic units often run outside rated VA, causing nuisance trips, board damage, or premature failure.
  • Install Difficulty: 2/5 — Shut off all power to the unit before beginning. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or quick-connect terminals. Verify 24V output before re-energizing the control board. Always photograph or label existing wiring before disconnecting.
  • Warranty: 1-year OEM factory warranty. In-stock and ships same business day from our warehouse.

Compatibility: Engineered for the Carrier PG8JAA042090AAJA packaged gas furnace. Confirm your unit's control circuit voltage and VA requirement on the data plate or wiring diagram before ordering. Have questions about fitment? Our HVAC parts specialists verify compatibility before you buy — reach out before placing your order.

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 PG8JAA042090AAJA?
Yes. This is the factory-specified OEM transformer for the Carrier PG8JAA042090AAJA. 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 PG8JAA042090AAJA?
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