ICP 40VA Transformer for WAHL184B2 — 208/230V to 24V OEM 1172028 | Ships Today

Overview

This genuine ICP control transformer (OEM part 1172028) steps the 208/230V line voltage down to the 24V control voltage that powers the thermostat, relays, and low-voltage circuits in the WAHL184B2. Rated at 40VA, it supplies the control current the system needs to call for heat and cooling. A failed transformer leaves the system completely dead at the thermostat — no display, no relay clicks, and no response to a call. Open windings or a shorted secondary are common failure modes, often triggered by a low-voltage short downstream.

Specifications

Compatibility

The factory-correct 40VA control transformer for the ICP WAHL184B2 and matching Tempstar, Heil, and Comfortmaker chassis. Verify the primary tap and VA rating against your existing transformer before installing.

Installation Guide

1. Safety First — Disconnect power at the breaker and verify zero voltage with a multimeter.
2. Access — Remove the control compartment service panel.
3. Document — Photograph all primary and secondary wire connections before disconnecting.
4. Remove — Unhook the wiring and unbolt the old transformer from the mounting bracket.
5. Install — Mount the new transformer, land the primary on the correct 208 or 230V tap, and reconnect the 24V secondary per your photo.
6. Test — Restore power, confirm 24V at the secondary, and verify the thermostat powers up.

Signs You Need a Replacement

• Thermostat is blank and the system is fully unresponsive
• No 24V reading across the secondary terminals
• Repeated blown control fuse
• Burnt smell or visibly scorched transformer body

Shipping & Returns

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