What are the specs for this Control Board?

The correct replacement for ICP model RGS121HDCA0AAA — OEM Kit | 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 RGS121HDCA0AAA — OEM Kit | Ships Today.

ICP

ICP Integrated Furnace Control Board for RGS121HDCA0AAA — OEM Kit | Ships Today

Name: ICP Integrated Furnace Control Board for RGS121HDCA0AAA — OEM Kit | Ships Today
Brand: ICP
SKU: 1183618
Price: 246.94 USD
Availability: InStock

SKU: 1183618 Brand: ICP

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Overview

This OEM control board kit (part #1183618) is the integrated furnace control (IFC) that manages every operating sequence in your ICP RGS121HDCA0AAA gas furnace. It governs ignition timing, the inducer and blower motors, gas valve sequencing, and all safety lockouts, while reading flame sense and pressure switch feedback. When the board fails, the furnace may not respond to thermostat calls, blowers may run continuously or not at all, or the unit may flash a hard-lockout diagnostic code. Heat damage, surface corrosion, and tripped onboard relays are common failure modes.

Specifications

Spec	Value
Part Number	1183618
Type	Integrated Furnace Control Board Kit
Brand	ICP (Heil / Tempstar)
Control Voltage	24V
Application	Gas Furnace Ignition & Blower Control

Compatibility

Designed for the ICP / Heil / Tempstar RGS121HDCA0AAA gas furnace. The kit ships with mounting hardware and instructions to match the original board's plug layout.

Installation Guide

Safety First — Disconnect power and gas, verify zero voltage with a multimeter.
Access — Remove the furnace control compartment panel.
Document — Photograph every harness connector and DIP switch position.
Remove — Unplug all connectors, remove mounting screws, and lift out the old board.
Install — Mount the new board, match DIP switch settings, and reconnect each harness per your photo.
Test — Restore power and gas, then verify a complete heat cycle and clear diagnostic codes.

Signs You Need a Replacement

Furnace unresponsive to thermostat calls
Blower runs constantly or never engages
Repeated hard lockouts with diagnostic flash codes
Visible scorching or corrosion on the board

Shipping & Returns

Ships same day before 3 PM CST. 30-day returns. 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 Integrated Furnace Control B...

$246.94

Frequently Asked Questions

Does this Control Board fit my ICP RGS121HDCA0AAA — OEM Kit | Ships Today?

Yes. This is the factory-specified OEM control board for the ICP RGS121HDCA0AAA — OEM Kit | 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 RGS121HDCA0AAA — OEM Kit | 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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