ICP Furnace Control Board Kit for RHS243S0BA0AAAA — OEM 1183618 | Ships Today

Overview

This OEM control board kit (part number 1183618) is the brain of your ICP / Tempstar / Heil RHS243S0BA0AAAA heat pump system. The board manages call-for-cool and call-for-heat sequencing, defrost timing, fan staging, and safety lockouts. When a control board fails you will typically see a unit that won't start, intermittent operation, blower that runs constantly, no defrost in heat-pump mode, or fault/error LED codes flashing on the board itself. This is a complete kit replacement — supplied with the correct board for this model so you avoid the guesswork of cross-referencing legacy revisions.

Specifications

Compatibility

Engineered as a direct-fit replacement for the ICP / Tempstar / Heil RHS243S0BA0AAAA heat pump. Verify your existing board's part number against 1183618 before ordering. Backed by the National HVAC Parts fitment guarantee.

Installation Guide

1. Safety First — Disconnect power at the disconnect and breaker, then verify zero voltage with a multimeter before touching any wiring.
2. Access — Remove the control/access panel to expose the board.
3. Document — Photograph every wire and connector position before disconnecting anything.
4. Remove — Label and unplug each harness, release the board standoffs/screws, and lift out the failed board.
5. Install — Mount the new 1183618 board on the standoffs and reconnect every harness exactly per your photos.
6. Test — Restore power and verify a normal cool, heat, and defrost cycle with no fault codes.

Signs You Need a Replacement

• Unit will not start on a valid call for heat or cool
• Blower runs continuously or fails to energize
• No defrost cycle in heat-pump mode (icing on the outdoor coil)
• Fault/error LED codes or visible burn marks/relays on the board

Shipping & Returns

Ships same day before 3 PM CST. 30-day returns. Backed by the National HVAC Parts fitment guarantee.