ICP 40VA Transformer for WFAR040A030A1 — 120/24V | Ships Today

Overview

The genuine OEM 40VA control transformer (part number 1177217) for the ICP/Heil/Tempstar WFAR040A030A1 air handler. It steps the 120V line voltage down to the 24V control voltage that powers the thermostat, relays, and low-voltage circuits. Rated at 40VA, it supplies enough capacity for the unit's control loads. A failed transformer is one of the most common causes of a completely dead system: no thermostat display, no call for heat or cool, and no relay action. Transformers typically fail from a low-voltage short, a shorted contactor coil, or age-related winding breakdown.

Specifications

Compatibility

Direct factory replacement for the ICP WFAR040A030A1 air handler, also sold under Heil, Tempstar, and Comfortmaker labels. Confirm your primary supply is 120V and that loads match the 40VA capacity before installing.

Installation Guide

1. Safety First — Disconnect power and verify zero voltage with a multimeter on both primary and secondary leads.
2. Access — Remove the service panel to reach the control area.
3. Document — Photograph every primary and secondary wire before disconnecting.
4. Remove — Unbolt the old transformer from its mounting and release the leads.
5. Install — Mount the new transformer and reconnect the 120V primary and 24V secondary per your photo.
6. Test — Restore power and verify 24V across the secondary and a live thermostat.

Signs You Need a Replacement

• Blank thermostat with no 24V present
• System completely unresponsive to any call
• Repeated blown low-voltage fuse
• Burnt smell or visibly scorched transformer windings

Shipping & Returns

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