ICP 40VA Transformer for WAHA30114A1 — 208/230V to 24V | Ships Today

Overview

This genuine OEM control transformer (part number 1173844) steps 208/230V line voltage down to the 24V control voltage that powers your thermostat, relays, and contactor coil. Rated at 40VA, it supplies the low-voltage control circuit on ICP, Tempstar, and Heil air handlers. A failed transformer is one of the most common causes of a completely dead control system — no thermostat display, no fan, no call response. Replacing it with the correct 40VA, 208/230-to-24V OEM transformer restores 24VAC to the board and brings the equipment back online.

Specifications

Compatibility

OEM control transformer for the ICP / Tempstar / Heil WAHA30114A1 air handler and other WAHA-series units that originally used the 1173844 40VA transformer. Verify your primary voltage (208/230V) and VA rating before ordering.

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 control/electrical compartment service panel.
3. Document — Photograph the primary and secondary wire connections before disconnecting.
4. Remove — Disconnect the line-voltage primary leads and the 24V secondary leads, then unbolt the old transformer from its bracket.
5. Install — Mount the new transformer, reconnect primary to 208/230V and secondary to the 24V control terminals exactly per your photos.
6. Test — Restore power and confirm 24VAC across the secondary terminals and normal thermostat/control operation.

Signs You Need a Replacement

• Blank thermostat and completely dead control circuit
• No 24VAC reading across the secondary terminals
• Repeatedly blown low-voltage fuse or buzzing transformer
• Burnt smell or discoloration at the transformer body

Shipping & Returns

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