ICP Transformer for WFMR110C048B1 — 40VA 120/24V | Ships Today

Overview

This OEM transformer (part number 1177217) supplies the low-voltage power your ICP WFMR110C048B1 system needs to run its controls. Rated at 40VA with a 120V primary and 24V secondary, it steps line voltage down to the 24V control circuit that powers the thermostat, gas valve, relays, and control board. A failed transformer is one of the most common causes of a completely dead system — no thermostat display, no blower, no ignition. When a transformer shorts or burns open, the entire 24V control circuit loses power even though line voltage is still present at the unit.

Specifications

Compatibility

Engineered as a direct-fit OEM replacement for the ICP WFMR110C048B1 and shared across many ICP-family furnaces and air handlers sold under the Heil, Tempstar, and Comfortmaker brands. Always confirm your existing transformer is a 120V-to-24V, 40VA unit before installing.

Installation Guide

1. Safety First — Disconnect power at the breaker and verify zero voltage with a multimeter.
2. Access — Remove the unit's service / control panel.
3. Document — Photograph all primary and secondary wire connections before disconnecting.
4. Remove — Disconnect the line-voltage primary and 24V secondary leads, then unbolt the transformer from its mounting bracket.
5. Install — Mount the new transformer, reconnect the primary and secondary leads exactly per your photo.
6. Test — Restore power and confirm 24V across the secondary terminals and normal system startup.

Signs You Need a Replacement

• System is completely dead — no thermostat display or call response
• No 24V reading across the secondary leads
• Burnt smell or visibly scorched transformer windings
• Repeated blown low-voltage fuses or tripping after a short

Shipping & Returns

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