What are the specs for this Control Board?

The correct replacement for ICP model RGS121LDCB0AAA — OEM Integrated Ignition Module | 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 RGS121LDCB0AAA — OEM Integrated Ignition Module | Ships Today.

ICP

ICP Furnace Control Board Kit for RGS121LDCB0AAA — OEM Integrated Ignition Module | Ships Today

Name: ICP Furnace Control Board Kit for RGS121LDCB0AAA — OEM Integrated Ignition Module | Ships Today
Brand: ICP
SKU: 1183618
Price: 245.70 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) brain of the ICP / Heil / Tempstar RGS121LDCB0AAA gas furnace. It sequences the entire heating cycle — inducer start, pressure-switch proving, igniter warm-up, gas valve timing, blower on/off delays, and safety lockouts — and monitors flame sense and limit switches. Supplied as a complete kit for a clean swap. Control boards fail from heat stress, voltage surges, corrosion, or cracked solder joints, often after a near-miss lightning strike or chronic overheating. Typical symptoms are a furnace that's completely dead, an inducer that won't start, no ignition sequence at all, or an LED diagnostic code flashing a board or component fault.

Specifications

Spec	Value
Part Number	1183618
Type	Integrated Furnace Control Board Kit
Brand	ICP / Heil / Tempstar
Function	Ignition, blower & safety sequencing
Diagnostics	Onboard LED fault codes
Fitment	OEM Direct Replacement Kit

Compatibility

Built for the ICP/Heil/Tempstar RGS121LDCB0AAA furnace and related RGS-series Comfortmaker/Heil units using the same control platform. Match the OEM number and connector layout to your existing board before installing.

Installation Guide

Safety First — Disconnect power at the switch and breaker; verify zero voltage with a multimeter.
Access — Remove the furnace control/blower compartment panel.
Document — Photograph every wire and connector position on the old board before removing anything.
Remove — Unplug all harnesses, release the board standoffs/screws, and lift the old board out.
Install — Mount the new board, then reconnect each harness exactly per your photo.
Test — Restore power and run a full heat cycle; confirm a normal LED status code and proper blower timing.

Signs You Need a Replacement

Furnace is completely unresponsive to a heat call
No inducer start or no ignition sequence
LED flashing a hardware/board fault code
Visible burn marks, corrosion, or relay chatter 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 RGS121LDCB0AAA — OEM Integrated Ignition Module | Ships Today?

Yes. This is the factory-specified OEM control board for the ICP RGS121LDCB0AAA — OEM Integrated Ignition Module | 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 RGS121LDCB0AAA — OEM Integrated Ignition Module | 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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