Same-day shipping before 3PM CST · 35,000+ OEM Parts · Texas CMBL & SAM.gov Registered · Government POs Accepted

Menu

Home Shop All Account Cart
OEM Carrier DSI Control Board LH33WP003 for PY1RPA048074AAWA
OEM Carrier DSI Control Board LH33WP003 for PY1RPA048074AAWA
OEM Carrier DSI Control Board LH33WP003 for PY1RPA048074AAWA
OEM Carrier DSI Control Board LH33WP003 for PY1RPA048074AAWA
Carrier

OEM Carrier DSI Control Board LH33WP003 for PY1RPA048074AAWA

SKU: CARRIE-PY1RPA048074AAWA-CONTROL_BOARD-LH33WP003 Brand: Carrier
✓ Guaranteed to fit PY1RPA048074AAWA — or your money back. Terms

OEM Guaranteed

Same-Day Ship

30-Day Returns

Secure Checkout

Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

OEM Carrier Direct Spark Ignition (DSI) Control Board LH33WP003 for Model PY1RPA048074AAWA

This is the genuine OEM Carrier Direct Spark Ignition (DSI) control board, part number LH33WP003, factory-specified for the Carrier PY1RPA048074AAWA packaged rooftop unit. As the central intelligence of the heating system, this microprocessor-based board manages spark ignition sequencing, gas valve activation, combustion blower control, indoor fan motor operation, flame sensing, and safety lockout logic. When this board fails, typical symptoms include a complete no-heat condition, repeated ignition lockout faults, short-cycling, or the unit failing to advance past the trial-for-ignition stage. Fault codes displayed via onboard LED indicators will help pinpoint the failure during diagnosis.

  • Part Type: Direct Spark Ignition (DSI) Integrated Control Board | OEM Part # LH33WP003 | Also supersedes LH33WP003A
  • OEM vs Generic: This is the factory Carrier OEM board — engineered to exact timing, flame-sensing thresholds, and safety lockout specifications for the PY1RPA048074AAWA. Aftermarket substitutes may exhibit mis-timed ignition trials, nuisance lockouts, or incompatible blower delay profiles that shorten system life.
  • Install Difficulty: 3/5 — Requires disconnecting 120V line power and 24V control wiring. Tools needed: flat-head and Phillips screwdrivers, needle-nose pliers, multimeter. Photograph all harness connections before removal. Verify all safety interlocks are reconnected before restoring power. Recommended for qualified HVAC technicians.
  • Warranty: 1-year OEM factory warranty. In stock — ships same business day from our warehouse.

Compatibility: Designed for the Carrier PY1RPA048074AAWA packaged rooftop gas/electric unit. Verify your unit's data plate and existing board part number before ordering. Cross-references include LH33WP003A. Have a question about fitment? Our HVAC parts specialists confirm compatibility before you buy — contact us today and get your system back online fast.

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 PY1RPA048074AAWA?
Yes. This is the factory-specified OEM control board for the Carrier PY1RPA048074AAWA. 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 PY1RPA048074AAWA?
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.
Home Shop Search Account Cart
Fitment Guaranteed
MR
Mike Rivera
HVAC Parts Specialist — Online