ICP 40VA Transformer for WFMR070A036B1 — 120V to 24V | Ships Today

Overview

This OEM control transformer (part number 1177217, TRANSFORMER 40VA 120-24V) is the factory step-down transformer for the ICP/Heil/Tempstar WFMR070A036B1 gas furnace. It converts incoming 120-volt line power down to the 24-volt control voltage that powers the thermostat, control board, gas valve, and relays. Rated at 40VA, it supplies enough current to drive the full low-voltage control circuit. When a transformer fails — often from a shorted thermostat wire or an overloaded control circuit — the furnace goes completely dead at the thermostat: no display, no call for heat, and no response from the control board. A failed transformer is a common and easy-to-replace cause of a no-heat call.

Specifications

Compatibility

Fits the ICP/Heil/Tempstar/Comfortmaker WFMR070A036B1 furnace and many related WFMR-series furnaces and air handlers using a 40VA 120-to-24V control transformer. Verify your primary and secondary voltages before ordering.

Installation Guide

1. Safety First — Disconnect power at the breaker and 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 and unbolt the old transformer from its bracket.
5. Install — Mount the new transformer and reconnect 120V primary and 24V secondary leads exactly per your photo.
6. Test — Restore power and confirm 24V across the secondary and a normal thermostat call for heat.

Signs You Need a Replacement

• Thermostat is blank or dead with no 24V control power.
• Furnace does not respond to a call for heat.
• Burnt smell or visibly scorched transformer windings.
• Repeated 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.