ICP Furnace Control Board for RGS121SECA0AAA — OEM Integrated Ignition Control | Ships Today
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Overview
This OEM integrated furnace control board (kit part number 1183618) is the brain of the ICP/Heil/Tempstar RGS121SECA0AAA gas furnace. It manages the complete heating sequence — igniter warm-up, gas valve timing, inducer and blower operation, and all 24V safety circuits including limit and pressure switches. When this board fails, the furnace typically will not start, locks out after a few ignition attempts, or runs the blower continuously. The board includes onboard diagnostic LED flash codes that help technicians pinpoint faults quickly.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1183618 (KIT CONTROL BOARD) |
| Type | Integrated Furnace Ignition Control |
| Brand | ICP / Heil / Tempstar / Comfortmaker |
| Control Voltage | 24V |
| Fits Model | RGS121SECA0AAA |
| Diagnostics | Onboard LED flash codes |
Compatibility
Designed as the OEM replacement for the ICP/Heil/Tempstar RGS121SECA0AAA gas furnace and the broader RGS121 family that share this control assembly. Always confirm your existing board part number and connector layout against 1183618 before installing.
Installation Guide
- Safety First — Disconnect power at the furnace switch and breaker, then verify zero voltage at the board with a multimeter. Shut off the gas supply.
- Access — Remove the furnace blower-compartment service panel.
- Document — Photograph every wire harness and connector position before disconnecting anything.
- Remove — Unplug all connectors, remove the board mounting screws/standoffs, and lift out the failed control board.
- Install — Mount the new 1183618 board, reconnect every harness exactly per your photos, and set any DIP/jumper settings to match the original.
- Test — Restore gas and power, call for heat, and confirm a full ignition cycle with proper blower operation and no fault codes.
Signs You Need a Replacement
- Furnace fails to ignite or repeatedly locks out after ignition attempts
- Blower runs constantly or never engages
- Visible burn marks, corrosion, or cracked traces on the board
- Erratic operation or diagnostic LED showing a control/internal fault
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