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OEM Carrier Control Transformer 120V–24V 40VA for PH13NR042000AEAA
Carrier

OEM Carrier Control Transformer 120V–24V 40VA for PH13NR042000AEAA

SKU: CARRIE-PH13NR042000AEAA-TRANSFORMER-HT01AW229 Brand: Carrier
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OEM Carrier Control Transformer 120V–24V 40VA for Model PH13NR042000AEAA

This OEM control transformer (part number HT01AW229) is the factory-specified replacement for the Carrier PH13NR042000AEAA heat pump system. Its job is simple but mission-critical: step down 120V line voltage to the 24V AC signal that powers your thermostat, control board, and all low-voltage control circuits. When this transformer fails, the entire control system goes dark — the thermostat goes blank, the unit will not respond to calls for heating or cooling, and no contactors or relays will energize. If you're reading 0V at the R and C terminals on your thermostat, a failed transformer is one of the first components to suspect.

  • Specs: Primary voltage: 120V AC | Secondary voltage: 24V AC | VA rating: 40VA | Factory-matched windings and mounting footprint for direct drop-in replacement
  • OEM vs Generic: This OEM unit is wound to Carrier's exact VA tolerance, ensuring the control board and thermostat receive a stable, clean 24V signal. Undersized or off-spec generic transformers can cause nuisance lockouts, erratic thermostat behavior, and premature contactor coil burnout.
  • Install difficulty: 2/5 — Shut off power at the disconnect and breaker before starting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter. Verify 0V at primary terminals before touching wiring. Photograph all connections before removal.
  • Warranty: 1-year OEM factory warranty against defects. In stock and ships same business day from our warehouse.

Compatibility: Engineered as a direct OEM replacement for the Carrier PH13NR042000AEAA heat pump. Always confirm primary/secondary voltage and VA rating on your unit's data plate before ordering. Our HVAC parts specialists are available to verify fitment — order with confidence.

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 PH13NR042000AEAA?
Yes. This is the factory-specified OEM transformer for the Carrier PH13NR042000AEAA. 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 PH13NR042000AEAA?
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
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