What are the specs for this Control Board?

The correct replacement for ICP model RGS121HTCA0AAA — OEM Integrated 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 RGS121HTCA0AAA — OEM Integrated Control | Ships Today.

ICP

ICP Furnace Control Board Kit for RGS121HTCA0AAA — OEM Integrated Control | Ships Today

Name: ICP Furnace Control Board Kit for RGS121HTCA0AAA — OEM Integrated Control | Ships Today
Brand: ICP
SKU: 1183618
Price: 246.94 USD
Availability: InStock

SKU: 1183618 Brand: ICP

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Overview

This genuine OEM control board kit (part 1183618) is the integrated furnace control for the ICP / Tempstar / Heil RGS121HTCA0AAA gas furnace. The board is the brain of the furnace: it manages the ignition sequence, sequences the inducer and blower motors, monitors the pressure switch and limit safeties, and times the hot surface igniter and gas valve. When the control board fails the furnace may stop responding to thermostat calls, run the blower continuously, lock out on a false safety fault, or fail to ignite even though the igniter and gas valve are good. The kit ships with the board and the hardware needed for a direct replacement.

Specifications

Spec	Value
Part Number	1183618
Type	Integrated Furnace Control Board Kit
Brand	ICP / Tempstar / Heil
Line Voltage	120 VAC
Control Voltage	24 VAC
Fitment	OEM Direct Replacement Kit

Compatibility

Direct-fit replacement for the ICP / Tempstar / Heil RGS121HTCA0AAA furnace and shared-platform Comfortmaker, Arcoaire, Carrier and Bryant furnaces that use this integrated control. Always match the part number printed on your existing board, as control boards are firmware- and connector-specific.

Installation Guide

Safety First — Disconnect furnace power at the breaker and verify zero voltage at the board with a multimeter.
Access — Remove the furnace control-compartment panel.
Document — Photograph every wire harness and terminal on the old board before unplugging anything.
Remove — Unplug each harness, release the board's mounting standoffs or screws, and remove the old control.
Install — Mount the new board, transfer each harness to the identical terminal per your photo, and confirm jumper/dip settings match.
Test — Restore power, call for heat, and watch a full ignition cycle plus the diagnostic LED to confirm normal operation.

Signs You Need a Replacement

Furnace does not respond to thermostat calls for heat.
Diagnostic LED flashes a hard-fault or control-failure code.
Blower runs continuously or cycles erratically.
No ignition sequence even though igniter and gas valve test good.

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...

$246.94

Frequently Asked Questions

Does this Control Board fit my ICP RGS121HTCA0AAA — OEM Integrated Control | Ships Today?

Yes. This is the factory-specified OEM control board for the ICP RGS121HTCA0AAA — OEM Integrated 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 RGS121HTCA0AAA — OEM Integrated 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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