What are the specs for this Control Board?

The correct replacement for ICP model RGS121HSCA0AAA — OEM Ignition Control | Ships Today is this exact part. It is the factory-specified replacement with exact OEM specifications. Using a part with different specifications can cause equipment damage or void your warranty. You can verify this by checking the data plate on your ICP equipment which lists the model number RGS121HSCA0AAA — OEM Ignition Control | Ships Today.

ICP

ICP Furnace Control Board Kit for RGS121HSCA0AAA — OEM Ignition Control | Ships Today

Name: ICP Furnace Control Board Kit for RGS121HSCA0AAA — OEM Ignition Control | Ships Today
Brand: ICP
SKU: 1183618
Price: 245.70 USD
Availability: InStock

SKU: 1183618 Brand: ICP

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Overview

This OEM furnace control board kit (part 1183618) is the brain of your ICP / Tempstar / Heil RGS121HSCA0AAA gas furnace. It manages the ignition sequence, sequences the inducer and blower motors, monitors safety inputs from the pressure switch and limit, and times the gas valve through every heat call. The kit includes the board and the hardware needed for a direct replacement. Control boards fail from power surges, cracked solder joints, blown relays, or scorched traces — symptoms range from no response at all to intermittent lockouts and short cycling.

Specifications

Spec	Value
Part Number	1183618
Type	Integrated Furnace Ignition Control Board Kit
Brand	ICP / Tempstar / Heil
Function	Ignition sequencing, blower/inducer timing, safety monitoring
Fits Model	RGS121HSCA0AAA

Compatibility

Engineered for the ICP-family RGS121HSCA0AAA and shared Tempstar, Heil, and Comfortmaker gas furnaces built on this control platform. Verify the original board part number on your existing board before ordering.

Installation Guide

Safety First — Disconnect power and verify zero voltage with a multimeter.
Access — Remove the furnace control/blower compartment panel.
Document — Photograph every harness plug and terminal on the old board before disconnecting.
Remove — Unplug the connectors, remove the mounting screws, and lift out the failed board.
Install — Mount the new board, transfer each connector to its matching position per your photo, and set any link/jumper settings the same as the original.
Test — Restore power and run a full heat cycle to confirm correct ignition, blower timing, and no fault codes.

Signs You Need a Replacement

Furnace completely unresponsive on a heat call
Intermittent lockouts or random short cycling
Blower or inducer fails to start or stop on schedule
Visible burn marks, cracked traces, or a burnt smell on the board

Shipping & Returns

Ships same day before 3 PM CST. 30-day returns. Backed by the National HVAC Parts fitment guarantee.

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 $75
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

ICP Furnace Control Board Kit fo...

$245.70

Frequently Asked Questions

Does this Control Board fit my ICP RGS121HSCA0AAA — OEM Ignition Control | Ships Today?

Yes. This is the factory-specified OEM control board for the ICP RGS121HSCA0AAA — OEM Ignition Control | Ships Today. 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 ICP RGS121HSCA0AAA — OEM Ignition Control | Ships Today?

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 ICP 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 ICP 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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