ICP Transformer for WAHA30054A1 — 40VA 208/230V to 24V | Ships Today

Overview

This is a genuine OEM 40VA control transformer (OEM part #1173844) for the ICP / Tempstar / Heil model WAHA30054A1 air handler. The transformer steps down line voltage of 208/230V on the primary side to 24V on the secondary side, supplying the low-voltage control circuit that powers the thermostat, relays, contactor coil, and control board. Without a healthy transformer, the entire 24V control system goes dead. Common failure symptoms include a completely unresponsive thermostat, no call for heating or cooling reaching the equipment, a tripped or blown low-voltage fuse, or a buzzing/overheating transformer body. A shorted control wire or a failed component downstream will often take the transformer with it, so inspect the rest of the 24V circuit when replacing.

Specifications

Compatibility

Engineered as a direct-fit replacement for ICP model WAHA30054A1 and shared across many ICP-family air handlers and furnaces sold under the Tempstar, Heil, Comfortmaker, and Arcoaire brands that use a 208/230V to 24V 40VA control transformer. Always confirm the primary/secondary voltage and VA rating against the unit being serviced.

Installation Guide

1. Safety First — Disconnect power at the breaker and verify zero voltage with a multimeter before touching any wiring.
2. Access — Remove the service/control panel to expose the transformer.
3. Document — Photograph all primary and secondary wire connections before disconnecting.
4. Remove — Note the primary tap used (208 vs 230), disconnect the leads, and unbolt the old transformer from the mounting bracket.
5. Install — Mount the new transformer, land the primary leads on the matching voltage tap, and reconnect the 24V secondary per your photo.
6. Test — Restore power and confirm 24V (±10%) at the secondary and normal thermostat operation.

Signs You Need a Replacement

• Thermostat screen is blank and the system is completely unresponsive.
• No 24V reading at the transformer secondary terminals.
• Repeatedly blown low-voltage fuse or breaker on the control circuit.
• Transformer is hot to the touch, buzzing, or has a burnt smell.

Shipping & Returns

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