ICP Transformer for SUP20M2401AIA — 40VA 120V to 24V | Ships Today

Overview

This OEM 40VA control transformer (part number L01F009) supplies the 24-volt low-voltage power that runs the control circuit on your ICP/Heil/Tempstar SUP20M2401AIA unit. It steps line-voltage 120V down to 24VAC to energize relays, the control board, contactor coils, and the thermostat circuit. When a transformer fails, the entire low-voltage side goes dead: no thermostat display, no cooling or heating call, and a contactor that will not pull in. Transformers fail from age, voltage spikes, a shorted secondary, or a seized component drawing excess current. This 40VA rating provides ample headroom for the unit's control load.

Specifications

Compatibility

Direct OEM fit for the ICP SUP20M2401AIA and shared-platform ICP/Heil/Tempstar/Comfortmaker package units using the L01F009 transformer. Always confirm primary voltage (120V) and VA rating against the failed unit before installing.

Installation Guide

1. Safety First — Disconnect power at the disconnect and breaker, then verify zero voltage with a multimeter.
2. Access — Remove the control-panel service panel.
3. Document — Photograph every wire on the primary and secondary terminals before disconnecting.
4. Remove — Label and disconnect the leads, unbolt the transformer from its mounting bracket, and lift it out.
5. Install — Mount the new transformer, reconnect 120V to the primary and 24V leads to the secondary exactly per your photo.
6. Test — Restore power and confirm 24VAC across the secondary with a meter, then verify the system responds to a thermostat call.

Signs You Need a Replacement

• Dead thermostat — blank display or no power to controls.
• System will not start on any call for heat or cool.
• No 24VAC measured across the transformer secondary.
• Burnt smell, visible scorching, or a tripped/blown low-voltage fuse.

Shipping & Returns

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