ICP 40VA Transformer for WPG4604130RKB1 — 208/230V to 24V | Ships Today

Overview

This OEM step-down control transformer (part 1173691) with its mounting barrier (part 1178431) is the factory replacement for the ICP / Tempstar / Heil WPG4604130RKB1 gas furnace. The transformer takes incoming 208/230V line voltage and steps it down to the 24V control circuit that powers the thermostat, control board, gas valve, and relays. Rated at 40VA, it supplies enough power for the full low-voltage control load. When a transformer fails — usually from a short in the control wiring, a stuck gas valve, or simple age — the furnace goes completely dead at the thermostat: no display, no call for heat, no blower. A blown transformer is frequently a symptom of a downstream short, so inspect the 24V circuit before powering up the replacement.

Specifications

Compatibility

Built as the correct replacement for the ICP WPG4604130RKB1 furnace. Because ICP manufactures equipment under the Tempstar, Heil, Comfortmaker, and Arcoaire names, this 40VA 208/230-to-24V transformer also fits equivalent furnaces across those lines that originally used parts 1173691 and 1178431. Verify your primary voltage tap and VA rating before installing.

Installation Guide

1. Safety First — Shut off power at the furnace switch and breaker, then verify zero voltage with a multimeter before working.
2. Access — Remove the furnace control/burner access panel.
3. Document — Photograph all primary and secondary wire connections and the barrier orientation.
4. Remove — Disconnect the leads, unscrew the transformer and barrier, and remove them.
5. Install — Mount the new transformer with its barrier, then reconnect the correct primary tap (208 or 230V) and the 24V secondary leads per your photo.
6. Test — Restore power and confirm 24V at the secondary and a normal thermostat call.

Signs You Need a Replacement

• Furnace is completely dead — no thermostat display and no response to a heat call.
• No 24V reading across the transformer secondary terminals.
• Burnt smell or visible scorching/melting on the transformer body.
• Repeated control-fuse blowing traced back to the transformer.

Shipping & Returns

Ships same day on orders placed before 3 PM CST. 30-day hassle-free returns. Backed by the National HVAC Parts fitment guarantee.