ICP 40VA Transformer for RHS090H0BB0AAAA — 24V Control Circuit | Ships Today

Overview

This OEM 24V control transformer powers the low-voltage circuit on the ICP/Tempstar/Heil RHS090H0BB0AAAA heat pump. It converts 208/240V line voltage into a steady 24V supply for the contactor coil, reversing valve solenoid, defrost board, and thermostat. Rated at 40VA, it carries the combined accessory load without sagging. When the transformer fails, the control side dies — the contactor will not pull in, the compressor and outdoor fan stay off, and the thermostat may lose power entirely. Failures usually trace to a shorted secondary, an overloaded reversing valve solenoid, or coil burnout after years of heat cycling.

Specifications

Compatibility

Direct-fit replacement for the ICP/Tempstar/Heil RHS090H0BB0AAAA heat pump and related RHS090 units sharing the same 24V control circuit. Confirm the secondary voltage and VA rating against your existing transformer before installing.

Installation Guide

1. Safety First — Disconnect power at the breaker and unit disconnect, then verify zero voltage with a multimeter.
2. Access — Remove the control-panel service cover to expose the transformer.
3. Document — Photograph all primary and secondary connections before disconnecting.
4. Remove — Label and disconnect the leads, then unbolt the failed transformer from its bracket.
5. Install — Mount the new transformer and reconnect the leads exactly per your photo.
6. Test — Restore power, confirm 24V across the secondary, and verify the contactor energizes on a cooling call.

Signs You Need a Replacement

• No 24V reading across the secondary terminals
• Contactor will not energize and the system stays dead on a thermostat call
• Blank or unresponsive thermostat with line power present
• Burnt smell, scorching, or a blown low-voltage fuse at the board

Shipping & Returns

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