ICP 24V Control Transformer for RHS048S0BB0AAAA — 40VA Class II | Ships Today

Overview

This OEM 24V control transformer assembly powers the low-voltage control circuit on the ICP Tempstar Heil RHS048S0BB0AAAA heat pump. Rated at 40VA with a 24V Class II secondary, it steps line voltage down to the 24V needed to energize the reversing valve coil (P/N 1172619), the DPST control relay (P/N 1178205, T92P7A22-24), and the reversing valve with coil (P/N 1175367). When the transformer weakens or fails, the entire 24V control circuit goes dead — no thermostat response, no relay pull-in, and no reversing-valve operation, so the system will not switch between heating and cooling.

Specifications

Compatibility

Engineered for the ICP / Tempstar / Heil RHS048S0BB0AAAA heat pump and other RHS048-series units sharing the same low-voltage control package. Always confirm your model and part number before ordering.

Installation Guide

1. Safety First — Disconnect power at the breaker and verify zero voltage with a multimeter.
2. Access — Remove the control-panel service cover.
3. Document — Photograph all wiring before disconnecting.
4. Remove — Label and disconnect the primary and 24V secondary leads, then unbolt the failed transformer/relay.
5. Install — Mount the new component and reconnect each lead per your photo.
6. Test — Restore power and confirm 24V at the secondary and proper reversing-valve operation.

Signs You Need a Replacement

• No 24V at the control terminals (dead thermostat)
• Relay will not pull in or chatters
• Reversing valve fails to shift between heat and cool
• Visible scorching or a blown low-voltage fuse

Shipping & Returns

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