ICP Transformer for WAHA18054A1 — 208/230V to 24V 40VA | Ships Today

Overview

This is a genuine OEM control transformer (part number 1173844) for the ICP/Tempstar/Heil WAHA18054A1 system. The transformer steps down line voltage of 208/230 volts to the 24-volt control circuit voltage that powers your thermostat, contactor coils, relays, and control board. It is rated at 40VA, providing ample capacity for the low-voltage control loads in this air handler/heat pump platform. When a control transformer fails, the entire low-voltage circuit goes dead — the thermostat screen goes blank, the contactor will not pull in, and the system will not start a heating or cooling cycle even though high-voltage power is present.

Specifications

Compatibility

Engineered as the factory replacement for the ICP/Tempstar/Heil WAHA18054A1 and related Comfortmaker-family equipment that uses a 208/230V primary, 24V secondary, 40VA control transformer. Always confirm your existing transformer's primary and secondary voltage and VA rating against the specs above before installing.

Installation Guide

1. Safety First — Disconnect power at the breaker and disconnect switch, then verify zero voltage with a multimeter before touching any wiring.
2. Access — Remove the service panel to expose the control compartment.
3. Document — Photograph all primary and secondary wire connections before disconnecting anything.
4. Remove — Disconnect the primary (line) and secondary (24V) leads, then unbolt the failed transformer from its mounting bracket.
5. Install — Mount the new transformer, reconnecting the primary leads to line voltage and the secondary leads to the 24V control circuit per your photo.
6. Test — Restore power and verify 24V across the secondary terminals, then confirm the thermostat and contactor energize normally.

Signs You Need a Replacement

• Blank thermostat with no low-voltage power present
• Contactor or control board will not energize despite line power
• No 24V reading across the transformer secondary
• Burnt smell, blown internal fuse, or visibly scorched transformer housing

Shipping & Returns

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