ICP Control Transformer for RGS240HSFA0AAAA — 40VA 24V Class 2 | Ships Today

Overview

This OEM 24-volt control transformer and relay assembly powers the low-voltage control circuit on the ICP / Tempstar / Heil RGS240HSFA0AAAA furnace. It steps line voltage down to a stable 24V Class 2 secondary that energizes the contactor, gas valve, control board, and the 24V DPDT (1183814) and DPST (1178205) relays that switch the unit's components. When the transformer or its relays fail, the entire control circuit goes dead — no call for heat or cool is honored even though line power is present. Rated at 40VA, this component supplies sufficient current for all simultaneous 24V loads on the system.

Specifications

Compatibility

Engineered as a direct-fit replacement for the ICP/Tempstar/Heil model RGS240HSFA0AAAA and shared-platform RGS-series gas furnaces using the same 24V control architecture. Always confirm your existing transformer's VA rating and voltage before installing.

Installation Guide

1. Safety First — Disconnect power at the breaker and verify zero voltage at the unit with a multimeter.
2. Access — Remove the furnace service panel to expose the control compartment.
3. Document — Photograph all primary and secondary wire terminations before disconnecting.
4. Remove — Unscrew the mounting bracket, label and disconnect the line-voltage primary and 24V secondary leads, and lift out the old transformer/relay.
5. Install — Mount the new component, reconnect each wire exactly per your photo, and secure the bracket.
6. Test — Restore power and verify a steady 24V reading across the secondary terminals under a call for heat.

Signs You Need a Replacement

• No 24V output measured at the secondary terminals
• System completely unresponsive to thermostat calls despite line power
• Burnt smell or visibly charred transformer windings
• Relays chattering, sticking, or failing to switch loads

Shipping & Returns

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