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OEM Carrier 75VA Transformer 200/230/460V–24V for PH1SEA090000AAAA
Carrier

OEM Carrier 75VA Transformer 200/230/460V–24V for PH1SEA090000AAAA

SKU: CARRIE-PH1SEA090000AAAA-TRANSFORMER-HT01BD236 Brand: Carrier
✓ Guaranteed to fit PH1SEA090000AAAA — or your money back. Terms

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Texas CMBL #19328542014
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OEM Carrier 75VA Control Transformer HT01BD236 for Model PH1SEA090000AAAA

This OEM Carrier control transformer (part #HT01BD236) is the factory-specified replacement for the Carrier PH1SEA090000AAAA packaged heat pump unit. The transformer steps high-voltage primary power — 200/230/460V — down to a safe 24V AC secondary output that energizes the entire low-voltage control circuit: thermostat, contactor coil, reversing valve, and safety controls. When the transformer fails, the result is typically a completely unresponsive system — the thermostat goes dark, nothing calls for heating or cooling, and the unit sits completely dead. A blown transformer is often caused by a shorted wire, a stuck contactor coil, or a control board fault — always diagnose the root cause before replacing.

  • Specs: 75VA rating | Primary: 200/230/460V multi-tap | Secondary: 24V AC | Class 2 | 50/60 Hz | Factory OEM part #HT01BD236
  • OEM vs Generic: This is the genuine Carrier OEM transformer, manufactured to exact factory VA rating and impedance tolerances. Generic alternatives risk nuisance tripping, under-voltage to controls, or premature failure due to looser VA and thermal ratings.
  • Install difficulty: 3/5 — Always shut off power at the disconnect and breaker before servicing. Tools needed: multimeter, flat-head and Phillips screwdrivers, wire stripper, needle-nose pliers. Label all 24V wiring before disconnecting. Verify primary tap matches your supply voltage. Check for downstream shorts before energizing.
  • Warranty: 1-year OEM factory warranty. Ships same business day from our warehouse — order by 3PM local time for same-day dispatch.

Compatibility: Designed for Carrier model PH1SEA090000AAAA packaged heat pump units. Also replaces legacy part numbers HT01BD235, HT01AX050, HT01BZ236, P541-7702, P541-7703, 305398-701, 15B0002N02, and 15B0002N05. Confirm your unit's supply voltage and verify the correct primary tap before installation. Not sure this is your part? Our HVAC parts specialists verify fitment before you order — call or chat 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 PH1SEA090000AAAA?
Yes. This is the factory-specified OEM transformer for the Carrier PH1SEA090000AAAA. 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 PH1SEA090000AAAA?
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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