ICP 40VA Transformer for RH5320363 — 208/240V to 24V | Ships Today

Overview

This genuine OEM control transformer (part number 1540372) steps down 208/240V line voltage to the 24V control voltage used by the ICP/Tempstar/Heil RH5320363 system. Rated at 40VA, it supplies the low-voltage power that operates the thermostat, contactor coil, control board, and other 24V components. A failed transformer is a common no-cooling/no-heat cause: when it burns out or shorts, the entire 24V control circuit goes dead, and nothing responds to a thermostat call. Transformers typically fail from a shorted secondary, an overloaded control circuit, or a power surge.

Specifications

Compatibility

Direct factory replacement for the ICP, Tempstar, Heil, and Comfortmaker RH5320363. Confirm your primary voltage (208/240V), 24V secondary, and 40VA rating match before installing.

Installation Guide

1. Safety First — Disconnect power at the breaker and verify zero voltage with a multimeter.
2. Access — Remove the electrical service panel to reach the transformer.
3. Document — Photograph the primary and secondary wiring before disconnecting.
4. Remove — Disconnect the line-voltage primary leads and 24V secondary leads, then unbolt the transformer from its mount.
5. Install — Mount the new transformer and reconnect the primary and secondary wires per your photo.
6. Test — Restore power and confirm 24V across the secondary terminals.

Signs You Need a Replacement

• No 24V at the control board or thermostat
• System completely unresponsive to thermostat calls
• Burnt smell or visibly scorched transformer housing
• Repeatedly blown low-voltage fuse

Shipping & Returns

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