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OEM Carrier DSI Control Board LH33WP003 — PY2PNB024040AA
OEM Carrier DSI Control Board LH33WP003 — PY2PNB024040AA
OEM Carrier DSI Control Board LH33WP003 — PY2PNB024040AA
OEM Carrier DSI Control Board LH33WP003 — PY2PNB024040AA
Carrier

OEM Carrier DSI Control Board LH33WP003 — PY2PNB024040AA

SKU: CARRIE-PY2PNB024040AA-CONTROL_BOARD-LH33WP003 Brand: Carrier
✓ Guaranteed to fit PY2PNB024040AA — 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 PY2PNB024040AA

This is the genuine OEM Carrier Direct Spark Ignition (DSI) control board, part number LH33WP003, factory-specified for the Carrier PY2PNB024040AA packaged rooftop unit. As the central brain of your heating system, this microprocessor-based board manages the entire ignition sequence — from spark ignition and gas valve activation to blower motor control, inducer fan sequencing, and flame sensing. When it fails, symptoms typically include a no-heat lockout condition, repeated ignition attempts with no flame establishment, or the system failing to advance past pre-purge — leaving your building without heat.

  • Specs: Direct Spark Ignition (DSI) microprocessor control | Manages spark igniter, gas valve, combustion blower, and indoor fan motor | Integrated LED fault-code diagnostics | Monitors limit switches, flame sensing, and safety lockout | Compatible with 24V control circuit
  • OEM vs Generic: This is the genuine Carrier factory part — not an aftermarket substitute. OEM boards are programmed to exact timing sequences (pre-purge, trial for ignition, retry, lockout) that aftermarket boards may approximate but not perfectly replicate, risking nuisance lockouts or warranty voids.
  • Install difficulty: 3/5 — Requires disconnecting 24V control wiring harness and line-voltage connections. Always shut off power at the disconnect and gas supply before servicing. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter, phone camera to photograph all wiring before removal. Recommend licensed HVAC technician for rooftop unit service.
  • Warranty: 1-year OEM manufacturer warranty. Ships same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Designed for the Carrier PY2PNB024040AA packaged rooftop unit. Verify your existing board's part number against LH33WP003 or cross-reference LH33WP003A before ordering. Not sure? Our HVAC parts specialists verify fitment at no charge — contact us before you buy.

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 OEM Carrier DSI Control Board LH33WP003 — PY2PNB024040AA?
Yes. This is the factory-specified OEM control board for the Carrier OEM Carrier DSI Control Board LH33WP003 — PY2PNB024040AA. 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 OEM Carrier DSI Control Board LH33WP003 — PY2PNB024040AA?
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
HVAC Parts Specialist — Online