ICP 40VA Transformer for WFEL070B036A1 — 120/24V OEM Furnace Transformer | Ships Today

Overview

This OEM 40VA control transformer (part 1177217) steps 120V line power down to the 24V control voltage that powers the ICP Tempstar/Heil WFEL070B036A1 furnace's thermostat, gas valve, relays, and control board logic. Rated at 40VA with a 120V primary and 24V secondary, it is the foundation of the low-voltage control circuit. When the transformer fails — usually from a shorted secondary, an overloaded accessory, or simple age — the entire 24V system goes dead: no thermostat call, no ignition, no cooling. A blown transformer is a frequent root cause behind a furnace that appears completely unresponsive.

Specifications

Compatibility

Built for the ICP Tempstar/Heil WFEL070B036A1 furnace and shared ICP-family controls using the 40VA 120/24V transformer. Confirm primary voltage and VA rating against your existing unit before ordering.

Installation Guide

1. Safety First — Disconnect power at the switch and breaker; verify zero voltage with a multimeter.
2. Access — Remove the control-compartment service panel.
3. Document — Photograph the primary (line) and secondary (24V) lead connections before disconnecting.
4. Remove — Disconnect the leads, remove the transformer mounting screw or bracket, and lift out the failed unit.
5. Install — Mount the new 1177217 transformer, reconnect the 120V primary and 24V secondary leads exactly per your photos, and secure all connections.
6. Test — Restore power and confirm ~24V at the secondary and a normal thermostat call/ignition sequence.

Signs You Need a Replacement

• Furnace completely unresponsive — no 24V control power.
• No voltage at the thermostat or gas valve terminals.
• Transformer is hot, buzzing, or smells burnt.
• Repeatedly blown low-voltage fuse on the control board.

Shipping & Returns

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