ICP Furnace Control Board Kit for RGS121LSCB0AAA — Integrated Ignition | Ships Today
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Overview
This OEM furnace control board kit (#1183618) is the brain of your ICP RGS121LSCB0AAA gas furnace. The integrated ignition control sequences the entire heat cycle — it powers the inducer, proves the pressure switch, energizes the hot surface igniter, opens the gas valve, monitors flame via the sensor, and times the blower on and off. It also runs onboard diagnostics, flashing fault codes through an LED to speed up troubleshooting. Control boards typically fail from heat stress, power surges, cracked solder joints, or burned relays. When the board fails you may get no response at all, an intermittent no-heat, a blower that won't shut off, or a stuck fault code. Because the board governs gas ignition, it is a safety-critical component and should be replaced with the exact OEM kit rather than a generic substitute.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1183618 |
| Type | Integrated Furnace Ignition Control Board Kit |
| Brand | ICP (Tempstar / Heil / Comfortmaker) |
| Input Voltage | 120 VAC |
| Control Voltage | 24 VAC |
| Fit | OEM Direct Replacement |
Compatibility
Supplied as the factory control board kit for the ICP RGS121LSCB0AAA furnace and shared across compatible ICP-family Tempstar, Heil, and Comfortmaker units. Match your existing board's part number and connector layout before installing.
Installation Guide
- Safety First — Disconnect power and shut off gas, verify zero voltage with a multimeter.
- Access — Remove the furnace control/blower compartment panel.
- Document — Photograph every connector and wire on the existing board before unplugging.
- Remove — Unplug all harnesses and remove the board from its standoffs.
- Install — Mount the new board and reconnect each harness exactly per your photo and the kit instructions.
- Test — Restore power and gas, run a full heat cycle, and confirm no fault codes are flashing.
Signs You Need a Replacement
- Furnace completely unresponsive to a heat call
- Intermittent no-heat or random shutdowns
- Blower runs constantly or won't start
- Diagnostic LED flashing a hard fault or no light at all
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