ICP 40VA Transformer for WFHR080B036A1 — 120V to 24V | Ships Today

Overview

This is the OEM 40VA control transformer (part number 1177217) for the ICP / Heil / Tempstar WFHR080B036A1 gas furnace. It steps the 120V line voltage down to the 24V control voltage that powers the thermostat, control board, gas valve, and relays. A failed transformer is one of the most common causes of a completely dead 24V control circuit: no thermostat display, no response to a heat call, and no clicking from the control board. Failures are usually caused by a shorted low-voltage wire, a seized component drawing excess current, or simple age and heat fatigue.

Specifications

Compatibility

Direct OEM replacement for the WFHR080B036A1 furnace and other ICP-family Heil, Tempstar, and Comfortmaker units using a 40VA 120-to-24V control transformer. Verify your existing transformer is rated 40VA with a 120V primary and 24V secondary before ordering.

Installation Guide

1. Safety First — Disconnect power at the furnace switch and breaker, then verify zero voltage with a multimeter.
2. Access — Remove the furnace control-compartment service panel.
3. Document — Photograph the primary and secondary wire connections before disconnecting.
4. Remove — Disconnect the leads, remove the mounting screws, and take out the old transformer.
5. Install — Mount the new transformer and reconnect the primary (line) and secondary (24V) leads per your photos.
6. Test — Restore power and confirm 24V across the secondary terminals and normal control operation.

Signs You Need a Replacement

• Dead thermostat or no 24V control power.
• Furnace completely unresponsive to a call for heat.
• No measurable voltage across the secondary terminals.
• Burnt smell, discoloration, or buzzing from the transformer.

Shipping & Returns

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