What are the specs for this Control Board?

The correct replacement for ICP model RGS121HDCB0AAA — OEM Replacement | 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 RGS121HDCB0AAA — OEM Replacement | Ships Today.

ICP

ICP Furnace Control Board Kit for RGS121HDCB0AAA — OEM Replacement | Ships Today

Name: ICP Furnace Control Board Kit for RGS121HDCB0AAA — OEM Replacement | Ships Today
Brand: ICP
SKU: 1183618
Price: 214.50 USD
Availability: InStock

SKU: 1183618 Brand: ICP

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Overview

This genuine OEM furnace control board kit (OEM 1183618) is the brain of the ICP / Heil / Tempstar RGS121HDCB0AAA gas furnace. The integrated furnace control sequences the entire heat cycle: it reads the thermostat call, runs the inducer and pressure-switch proving, energizes the hot surface igniter, opens the gas valve, monitors flame via the sensor, and times the blower on/off delays. It also manages safety lockouts and flashes diagnostic fault codes through its onboard LED. When the board fails — from voltage surges, heat stress, or failed relays — the furnace may short cycle, fail to ignite, run the blower constantly, or go completely dead. This board kit ships with the mounting hardware and connectors needed for a clean swap and restores correct, safe sequencing.

Specifications

Spec	Value
OEM Part Number	1183618
Type	Integrated Furnace Control Board Kit
Brand	ICP / Heil / Tempstar
Function	Ignition, Blower & Safety Control
Diagnostics	Onboard LED Fault Codes
Fitment	OEM Replacement Kit

Compatibility

Direct OEM replacement kit for the ICP / Heil / Tempstar RGS121HDCB0AAA gas furnace. The same control platform is shared across several ICP-family furnace models. Verify the board's connector layout and part number against your existing control before installing.

Installation Guide

Safety First — Shut off gas and disconnect power, then verify zero voltage with a multimeter.
Access — Remove the blower-compartment service panel to expose the control board.
Document — Photograph every harness plug and its position before unplugging anything.
Remove — Unplug each connector, remove the mounting screws/standoffs, and lift out the old board.
Install — Mount the new board, transfer any jumpers/links, and reconnect each harness to the matching plug per your photos.
Test — Restore gas and power, run a full heat cycle, and confirm a steady LED with correct ignition and blower timing.

Signs You Need a Replacement

No response on a heat call, or no LED at all on the board.
Short cycling, random lockouts, or repeating fault-code flashes.
Blower runs continuously or never starts.
Visible burnt traces, scorched relays, or a burnt smell on the board.

Shipping & Returns

Ships same day on orders placed 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...

$214.50

Frequently Asked Questions

Does this Control Board fit my ICP RGS121HDCB0AAA — OEM Replacement | Ships Today?

Yes. This is the factory-specified OEM control board for the ICP RGS121HDCB0AAA — OEM Replacement | 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 RGS121HDCB0AAA — OEM Replacement | 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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