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 Transformer 40VA 24V for PH4GEXA48000AA — HT01BC701
Carrier

OEM Carrier Transformer 40VA 24V for PH4GEXA48000AA — HT01BC701

SKU: CARRIE-PH4GEXA48000AA-TRANSFORMER-HT01BC701 Brand: Carrier

OEM Guaranteed

Same-Day Ship

30-Day Returns

Secure Checkout

Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

OEM Carrier Control Transformer 40VA for Model PH4GEXA48000AA — Part # HT01BC701

This OEM Carrier control transformer (part number HT01BC701) is the factory-specified replacement for the Carrier PH4GEXA48000AA packaged heat pump unit. The transformer steps down line voltage (120V) to the 24V signal used by your thermostat, control board, contactor coil, and all low-voltage safety circuits. When it fails, absolutely nothing in the system responds — no fan, no compressor, no thermostat communication — making it one of the first components to check in a complete system no-response call.

  • Specs: 40VA rating | Primary: 120V | Secondary: 24V | Single-phase | Designed to OEM factory tolerances for the PH4GEXA48000AA
  • OEM vs Generic: OEM transformers like this HT01BC701 are wound to exact VA and voltage specifications. Undersized or off-tolerance generic units can overheat, trip internal fuses, and damage connected control boards — a costly secondary failure.
  • Install Difficulty: 2/5 — Shut off all power at the disconnect and breaker before servicing. Tools needed: flathead and Phillips screwdrivers, multimeter, wire nuts or spade connectors. Always verify 24V output with a meter before powering the full system.
  • Warranty: 1-year OEM factory warranty. Orders placed before cutoff ship the same business day from our stocked warehouse.

Compatibility: Verified fit for Carrier model PH4GEXA48000AA packaged heat pump units. Cross-reference your unit's data plate and existing transformer VA/voltage ratings before ordering. Our fitment team is available to confirm compatibility before you buy — ships fast so your system is back online 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 $75
  • 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 PH4GEXA48000AA — HT01BC701?
Yes. This is the factory-specified OEM transformer for the Carrier PH4GEXA48000AA — HT01BC701. 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 PH4GEXA48000AA — HT01BC701?
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