ICP 40VA Transformer for WFML110C048B1 — 120V to 24V | Ships Today

Overview

This genuine OEM 40VA control transformer (part number 1177217) steps 120-volt line power down to the 24-volt low-voltage control circuit on the ICP / Heil / Tempstar WFML110C048B1 furnace. It powers the control board, thermostat, gas valve, and igniter circuit. A failed transformer leaves the entire 24V control system dead — no thermostat response, no ignition sequence, and no call for heat. This 40VA unit delivers the exact rating the furnace was engineered for, so the control circuit has the current headroom it needs without nuisance dropouts.

Specifications

Compatibility

Direct OEM replacement for ICP-family model WFML110C048B1 and equivalent Heil, Tempstar, and Comfortmaker furnaces using the same 120/24V control platform. Verify the primary/secondary voltages and VA rating against your original transformer before installing.

Installation Guide

1. Safety First — Disconnect power at the switch and breaker, then verify zero voltage with a multimeter.
2. Access — Remove the furnace control / electrical panel.
3. Document — Photograph the primary and secondary wire connections before disconnecting.
4. Remove — Unbolt the transformer from its bracket and disconnect the line and low-voltage leads.
5. Install — Mount the new 40VA transformer, reconnect the 120V primary and 24V secondary leads per your photo.
6. Test — Restore power, confirm 24V at the secondary with a meter, and verify the thermostat triggers a normal heat call.

Signs You Need a Replacement

• No 24V at the control board or thermostat
• Furnace completely unresponsive to thermostat
• Blown low-voltage fuse on the control board
• Burnt smell or scorching at the transformer housing

Shipping & Returns

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