ICP 24V Control Transformer for WCH3484GKA2 — 40VA Class 2 | Ships Today

Overview

This OEM 24-volt control transformer powers the low-voltage control circuit on the ICP/Tempstar/Heil WCH3484GKA2 heat pump — feeding the thermostat, contactor coil, reversing valve solenoid, and board. It steps line voltage down to a steady 24V Class 2 output rated at 40VA. A failed transformer kills the entire low-voltage side: a blank thermostat, a contactor that won't pull in, and a system that ignores every call for heat or cool. Buzzing, overheating, or a tripped internal fuse link are classic symptoms that the transformer needs replacement.

Specifications

Compatibility

Direct-fit for the ICP WCH3484GKA2 heat pump and related WCH3484 series units sold under ICP, Tempstar, Heil, and Comfortmaker. Confirm primary line voltage and the 24V/40VA rating against the unit's wiring diagram before installing.

Installation Guide

1. Safety First — Disconnect power at the breaker and disconnect. Verify zero voltage at the primary leads with a multimeter.
2. Access — Remove the control panel cover to reach the transformer.
3. Document — Photograph the primary (line) and secondary (24V) connections before removing anything.
4. Remove — Disconnect the primary and secondary leads and unbolt the transformer.
5. Install — Mount the new transformer and reconnect primary and secondary wiring per your photo.
6. Test — Restore power, confirm 24V across the secondary, and verify the thermostat and contactor energize on a call.

Signs You Need a Replacement

• Dead thermostat / no low-voltage power at the board.
• Transformer buzzes, hums, or runs hot.
• System won't respond despite line power present.
• No 24V measured across the secondary with the unit powered.

Shipping & Returns

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