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OEM Carrier DSI Control Board LH33WP003 for PY3PNA024040NB
OEM Carrier DSI Control Board LH33WP003 for PY3PNA024040NB
OEM Carrier DSI Control Board LH33WP003 for PY3PNA024040NB
OEM Carrier DSI Control Board LH33WP003 for PY3PNA024040NB
Carrier

OEM Carrier DSI Control Board LH33WP003 for PY3PNA024040NB

SKU: CARRIE-PY3PNA024040NB-CONTROL_BOARD-LH33WP003 Brand: Carrier
✓ Guaranteed to fit PY3PNA024040NB — or your money back. Terms

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Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY3PNA024040NB

This is the genuine OEM Carrier Direct Spark Ignition (DSI) control board, part number LH33WP003, factory-specified for the Carrier PY3PNA024040NB packaged rooftop unit. The DSI control board is the brain of your heating system — it orchestrates the entire ignition sequence from inducer pre-purge through spark ignition, flame sensing, gas valve activation, and blower motor staging. When this board fails, you'll typically experience a complete no-heat condition, repeated ignition lockouts, or a unit that attempts ignition and then faults out after one to three trials. Intermittent heating, failure to prove flame, or a board with no LED activity are all telltale signs this component needs replacement.

  • Part Function: Microprocessor-based DSI control — manages spark igniter, gas valve, inducer motor, blower fan motor, and all limit/safety switch monitoring in sequence
  • OEM vs Generic: This is the genuine Carrier factory board, engineered to exact specifications for the PY3PNA024040NB. Aftermarket substitutes may approximate function but often lack precise timing tolerances and full safety interlock compatibility, which can affect reliability and longevity.
  • Install Difficulty: 4/5 — Requires disconnecting 24V control wiring harnesses, high-voltage blower leads, and flame-sense connections. Photograph all wiring before removal. Tools needed: #2 Phillips screwdriver, 1/4" nut driver, multimeter, insulated gloves. Always shut off gas supply and disconnect power at the disconnect box before beginning.
  • Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Designed for the Carrier PY3PNA024040NB packaged rooftop unit. Verify your OEM part number on the existing board or the unit data plate before ordering. Compatible board dimensions are 5 × 7 × 1.875 inches. Not sure it fits? Our HVAC parts specialists verify fitment before you buy — contact us today. Orders placed before 3 PM ship the same business day.

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 Control Board fit my Carrier PY3PNA024040NB?
Yes. This is the factory-specified OEM control board for the Carrier PY3PNA024040NB. 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 control board on my Carrier PY3PNA024040NB?
Difficulty: Advanced (1–2 hrs)
Step 1: Turn off breaker. Step 2: PHOTOGRAPH all wire connections before touching anything. Step 3: Label each wire with tape. Step 4: Disconnect all wires, remove old board. Step 5: Mount new board, reconnect all wires matching your photo exactly. Step 6: Restore power and test all modes. Exact part number match is critical.
My HVAC system is completely dead. What could be wrong?
Completely dead HVAC (no LED on board) = failed control board or blown fuse. Check board fuse first (3A or 5A, costs $1–$5). If fuse is good and board has power but no LED, board is dead. Always photograph wiring before replacing.
Is this control board 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 control board?
OEM essential. Control boards are model-specific with precise firmware and connector layouts. Aftermarket boards rarely match all functions and can cause intermittent failures or safety issues. Always match the exact OEM part number.
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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