What are the specs for this Control Board?

The correct replacement for ICP model RGS121HECA0AAA — OEM Kit 1183618 | 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 RGS121HECA0AAA — OEM Kit 1183618 | Ships Today.

ICP

ICP Integrated Furnace Control Board for RGS121HECA0AAA — OEM Kit 1183618 | Ships Today

Name: ICP Integrated Furnace Control Board for RGS121HECA0AAA — OEM Kit 1183618 | Ships Today
Brand: ICP
SKU: 1183618
Price: 223.60 USD
Availability: InStock

SKU: 1183618 Brand: ICP

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Overview

This is a genuine OEM integrated furnace control board kit (part number 1183618, KIT CONTROL BOARD) for the ICP / Tempstar / Heil RGS121HECA0AAA gas furnace. The control board is the brain of the furnace: it sequences the inducer, hot surface igniter, gas valve, and blower, monitors the pressure switch and limit safeties, and flashes diagnostic fault codes through its onboard LED. Supplied as a complete kit with the mounting hardware and instructions needed for a clean swap. When a furnace behaves erratically — no response to a heat call, blower running constantly, or repeated lockouts with no obvious mechanical cause — a failed control board is a frequent culprit.

Specifications

Spec	Value
OEM Part Number	1183618 (Kit, Control Board)
Type	Integrated Furnace Control Board
Brand	ICP / Tempstar / Heil / Comfortmaker
Fits Model	RGS121HECA0AAA
Functions	Ignition sequencing, blower timing, safety monitoring, diagnostics
Fitment	Direct OEM replacement kit

Compatibility

Direct-fit replacement for the ICP RGS121HECA0AAA gas furnace and related Tempstar, Heil, and Comfortmaker models specifying kit 1183618. Verify the part number printed on your existing board before ordering, as control boards are model-specific.

Installation Guide

Safety First — Disconnect power at the furnace switch and breaker. Verify zero voltage with a multimeter.
Access — Remove the control-compartment service panel.
Document — Photograph every wire and terminal on the old board before disconnecting anything.
Remove — Label and unplug each harness, remove the mounting screws, and lift out the old board.
Install — Mount the new board on the supplied standoffs and reconnect every harness exactly per your photo.
Test — Restore power, call for heat, and confirm a full clean cycle. Read the diagnostic LED to verify no fault codes remain.

Signs You Need a Replacement

No response to a thermostat heat call despite power present.
Blower runs continuously or fails to start.
Repeated, unexplained ignition lockouts.
Burned, scorched, or corroded traces, relays, or connectors 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 Integrated Furnace Control B...

$223.60

Frequently Asked Questions

Does this Control Board fit my ICP RGS121HECA0AAA — OEM Kit 1183618 | Ships Today?

Yes. This is the factory-specified OEM control board for the ICP RGS121HECA0AAA — OEM Kit 1183618 | 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 RGS121HECA0AAA — OEM Kit 1183618 | 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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