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OEM Carrier Transformer 40VA 208/240V–24V for PY2PPB042090NB
Carrier

OEM Carrier Transformer 40VA 208/240V–24V for PY2PPB042090NB

SKU: CARRIE-PY2PPB042090NB-TRANSFORMER-HT01BD209 Brand: Carrier
✓ Guaranteed to fit PY2PPB042090NB — or your money back. Terms

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Texas CMBL #19328542014
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Govt POs Accepted

OEM Carrier 40VA Control Transformer 208/240V to 24V for Model PY2PPB042090NB

This OEM control transformer is the factory-specified replacement for the Carrier PY2PPB042090NB packaged unit. The transformer steps down 208/240V line voltage to the 24V AC required by your thermostat, control board, contactor coil, and all low-voltage safety circuits. When this part fails, the entire control circuit goes dark — symptoms include a blank thermostat display, a system that won't respond to any call for heating or cooling, or tripped low-voltage fuses caused by an overloaded or shorted transformer winding.

  • Specs: 40VA capacity | 208/240V primary | 24V secondary | 50/60Hz | OEM part number HT01BD209 | Also replaces HT01BD207, HT01CN232, and 9076-00
  • OEM vs Generic: OEM transformers are wound to exact VA and impedance specs, protecting downstream boards and contactors from voltage sag under load. Generic units frequently run under-rated VA, causing nuisance trips and premature board failure.
  • Install difficulty: 2/5 — Shut off all power at the disconnect and breaker before beginning. Tools needed: flathead and Phillips screwdrivers, wire stripper, multimeter. Label all low-voltage wiring before disconnecting. Confirm 24V output with a meter before restoring thermostat connections.
  • Warranty: 1-year OEM manufacturer warranty. In stock and ships same business day from our warehouse.

Compatibility: Direct OEM replacement for Carrier model PY2PPB042090NB packaged heating and cooling units. Verify primary voltage (208V or 240V) on your unit's data plate before ordering. Not sure if this is your part? Our HVAC parts specialists verify fitment 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 PY2PPB042090NB?
Yes. This is the factory-specified OEM transformer for the Carrier PY2PPB042090NB. 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 PY2PPB042090NB?
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
HVAC Parts Specialist — Online