ICP 40VA Transformer for RHS048S0CA0AAA — 208/230V to 24V | Ships Today

Overview

This OEM control transformer powers the 24V low-voltage circuit on your ICP RHS048S0CA0AAA heat pump, feeding the contactor coil, reversing valve coil, defrost control, and thermostat. It steps 208/230V line voltage down to a stable 24V secondary at 40VA. A failed transformer shuts down the entire control circuit — the unit ignores the thermostat, the contactor won't energize, and the compressor and fan stay off despite line power being present. Telltale signs include zero volts at the secondary, a low-voltage fuse that keeps blowing, or audible buzzing from the transformer.

Specifications

Compatibility

Direct OEM replacement for the ICP / Tempstar / Heil RHS048S0CA0AAA 4-ton heat pump and other RHS-series condensing units that run a 40VA 24V control circuit. Confirm primary and secondary voltage against your existing transformer before installing.

Installation Guide

1. Safety First — Disconnect power at the breaker and disconnect, then verify zero voltage with a multimeter.
2. Access — Remove the condenser service panel to reach the control compartment.
3. Document — Photograph all primary and secondary wire connections before disconnecting.
4. Remove — Label and disconnect the leads, then unbolt the old transformer from its bracket.
5. Install — Mount the new transformer and wire the 208/230V primary and 24V secondary exactly per your photo.
6. Test — Restore power and confirm 24V across the secondary and proper system operation.

Signs You Need a Replacement

• No 24V at the secondary terminals with line voltage present
• Repeatedly blown low-voltage or board fuse
• Buzzing or burning smell from the transformer
• Contactor and reversing valve coil won't energize on a cooling call

Shipping & Returns

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