ICP Transformer for WFMR070A024B1 — 40VA 120V to 24V | Ships Today

Overview

This OEM control transformer (part #1177217, TRANSFORMER 40VA 120-24V) supplies low-voltage power to the control circuit of the ICP WFMR070A024B1 furnace. It steps 120V line voltage down to the 24V used by the thermostat, gas valve, control board, and relays. Rated at 40VA, it provides ample capacity for the furnace's control load. When a transformer fails — usually from a short, surge, or overheating — the entire 24V control system goes dead: no thermostat response, no call for heat, and no board activity. Replacing the transformer restores control power and brings the furnace back online.

Specifications

Compatibility

Designed for the ICP/Tempstar/Heil WFMR070A024B1 furnace and other models specifying OEM transformer 1177217. Verify your primary input is 120V and that 40VA meets your control-circuit load before installing.

Installation Guide

1. Safety First — Disconnect power at the breaker and verify zero voltage with a multimeter.
2. Access — Remove the furnace control/blower compartment service panel.
3. Document — Photograph all primary and secondary wire connections before disconnecting.
4. Remove — Unfasten the transformer mounting bracket and disconnect the leads.
5. Install — Mount the new transformer, matching 120V leads to line and 24V leads to the control circuit per your photo.
6. Test — Restore power and confirm 24V across the secondary and a normal call for heat.

Signs You Need a Replacement

• No 24V power to the thermostat or control board
• Furnace completely unresponsive to a heat call
• Burning smell or visibly scorched transformer windings
• 0V measured across the secondary with 120V present on the primary

Shipping & Returns

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