ICP 40VA Transformer for WJH424000KTP0A1 — 208/230V to 24V | Ships Today

Overview

This OEM 40VA control transformer (PN 1173691) steps the 208/230-volt line power down to the 24-volt control voltage that runs the thermostat, contactor coil, reversing-valve coil and control board in the ICP/Heil/Tempstar WJH424000KTP0A1 heat pump. Every low-voltage component in the system depends on this transformer for clean, regulated 24V power. When a transformer fails — usually from an overload, a shorted thermostat wire, or simple age — the entire control circuit goes dead: no thermostat display, no contactor pull-in, and no system operation. Replacing the transformer with the correct 40VA, 208/230-to-24V unit restores control power and protects downstream components. This part lives in the same control assembly as the reversing-valve coil and barrier hardware.

Specifications

Compatibility

Direct OEM fit for the ICP/Heil/Tempstar WJH424000KTP0A1 heat pump. As a standard 40VA 208/230-to-24V control transformer it also services comparable Heil, Tempstar, Comfortmaker and Carrier/Bryant units with the same control voltage. Confirm VA rating and primary/secondary voltages match your existing transformer before installing.

Installation Guide

1. Safety First — Disconnect power at the disconnect and breaker, then verify zero voltage with a multimeter on the primary leads.
2. Access — Remove the control-panel service cover.
3. Document — Photograph the primary (line) and secondary (24V) wire connections before disconnecting.
4. Remove — Disconnect the primary and secondary leads and unbolt the old transformer from its mounting tab.
5. Install — Mount the new transformer, land the 208/230V leads on the primary and the 24V leads on the secondary exactly as photographed.
6. Test — Restore power and confirm 24VAC across the secondary, then verify the thermostat and contactor energize.

Signs You Need a Replacement

• Thermostat is blank and the control circuit is dead.
• No 24V output measured across the secondary terminals.
• Transformer is hot, buzzing or smells burnt.
• Repeated control-fuse blows after a thermostat wiring short.

Shipping & Returns

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