ICP 24V Transformer for RHS243S0EA0AAAA — 40VA Class 2 Control Power | Ships Today

Overview

This OEM 24V control transformer supplies the low-voltage power that runs the contactors, relays, and reversing-valve coil inside your ICP RHS243S0EA0AAAA heat pump. It steps line voltage down to a stable 24 volts of Class 2 control power rated at 40VA. Related OEM components for this circuit include the 24V reversing-valve coil (part 1172619) and the 24V DPST relay (part 1178205, T92P7A22-24). When a control transformer fails, the unit goes completely dead at the thermostat — no fan, no compressor, no call response — even though high-voltage power is present at the disconnect. A buzzing transformer, a blown low-voltage fuse, or scorched secondary leads are the classic warning signs.

Specifications

Compatibility

Designed as a direct fit for the ICP RHS243S0EA0AAAA heat pump and other ICP-built systems using the same 24V control circuit. ICP manufactures equipment sold under the Tempstar, Heil, Comfortmaker, Arcoaire, and KeepRite labels, so this transformer also services equivalent models across those brands. Always confirm the VA rating and voltage on your existing transformer before installing.

Installation Guide

1. Safety First — Disconnect power at the unit and the breaker, then verify zero voltage with a multimeter before touching any wiring.
2. Access — Remove the service panel to expose the control box.
3. Document — Photograph every primary and secondary lead before disconnecting.
4. Remove — Unfasten the failed transformer from its mounting bracket and disconnect the primary (line) and secondary (24V) leads.
5. Install — Mount the new transformer, match the primary taps to your supply voltage, and reconnect the secondary leads exactly as photographed.
6. Test — Restore power and confirm 24V across the secondary terminals and a normal thermostat call.

Signs You Need a Replacement

• System is completely unresponsive at the thermostat despite line power being present
• Repeatedly blown low-voltage control fuse
• Audible buzzing or humming from the control box
• No measurable 24V on the secondary side under load

Shipping & Returns

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