ICP 40VA Transformer for WJH460000KTP0A1 — 208/230V to 24V | Ships Today

Overview

This OEM 40VA control transformer is the low-voltage power supply for the ICP / Tempstar / Heil WJH460000KTP0A1 heat pump system. It steps the incoming 208/230V line voltage down to the 24V control signal that powers the thermostat circuit, contactor coil, and reversing valve solenoid. When a transformer fails, the entire 24V control circuit goes dead — the system will not respond to a thermostat call even though line power is present. This assembly group also includes the reversing valve coil (1172619), the reversing valve with coil (1175622), and the 24V barrier (1176032) that the transformer drives. Common failure signs are a buzzing or silent transformer, a blown low-voltage fuse, or repeated control-board lockouts. Using a genuine OEM transformer guarantees the correct VA rating and lead configuration so the control circuit is neither starved nor overloaded.

Specifications

Compatibility

Engineered as the factory-spec transformer for the ICP / Tempstar / Heil model WJH460000KTP0A1 heat pump and air handler combination. It also fits the broader WJH family that shares this 208/230V control architecture. Always confirm your unit's primary voltage matches before installing.

Installation Guide

1. Safety First — Disconnect power at the breaker and disconnect, then verify zero voltage with a multimeter at the control terminals.
2. Access — Remove the control-box service panel.
3. Document — Photograph all primary and secondary lead connections before disconnecting.
4. Remove — Disconnect the line-voltage primary leads and the 24V secondary leads, then unbolt the transformer from its mounting bracket.
5. Install — Mount the new transformer, reconnect primary to line voltage and secondary to the 24V circuit exactly per your photo.
6. Test — Restore power and confirm a steady 24V reading across the secondary and proper system response to a thermostat call.

Signs You Need a Replacement

• No 24V at the secondary while line voltage is present at the primary
• Repeatedly blown low-voltage fuses on the control board
• Audible buzzing, overheating, or a burnt smell from the transformer
• System unresponsive to thermostat calls despite full line power

Shipping & Returns

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