ICP 24V Transformer for WATC30004A1 — 40VA Class 2 Control | Ships Today

Overview

This OEM 24V control transformer (part #202300900212) provides low-voltage control power for the ICP/Heil/Tempstar WATC30004A1. It steps line voltage down to a 24V secondary, energizing the contactor coil, relays, and thermostat circuit so the condensing unit can start and run. Rated at 40VA, it supplies stable control current to all low-voltage components. A failed transformer kills the entire control circuit — the contactor won't pull in and the unit stays dead despite line power. Buzzing, a repeatedly blown low-voltage fuse, or no reading across the secondary all point to a failed transformer.

Specifications

Compatibility

Direct OEM fit for the ICP/Heil/Tempstar WATC30004A1 condensing unit, and a common 24V control transformer across the ICP family of equipment sharing this low-voltage design. Verify your existing transformer's voltage and VA rating before installing.

Installation Guide

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

Signs You Need a Replacement

• No 24V at the contactor coil or thermostat despite line power
• Repeatedly blown low-voltage fuse
• Audible buzzing or humming from the transformer
• Unit will not start although high-voltage power is present

Shipping & Returns

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