ICP 40VA Transformer for SUP27M2401BIA — 120V to 24V | Ships Today

Overview

This OEM ICP Transformer (part L01F009) is a 40VA step-down transformer that converts 120V line power to the 24V control voltage your SUP27M2401BIA system needs to run the thermostat, relays, and control circuit. The matching 24VAC relay (part L01H009) switches the low-voltage load it powers. When the transformer fails — usually from a shorted control wire or overloaded circuit — you lose all 24V control power: a blank thermostat, no blower or heat/cool response, and often a blown low-voltage fuse. A correct OEM 40VA replacement restores stable control power.

Specifications

Compatibility

Direct-fit replacement for the ICP SUP27M2401BIA. This 40VA 120V-to-24V transformer (part L01F009) and its companion 24VAC relay (L01H009) are used across matching ICP-family units, including Heil and Tempstar models. Confirm primary voltage, VA rating, and the original part number on your existing transformer before ordering.

Installation Guide

1. Safety First — Disconnect power at the breaker and verify zero voltage with a multimeter before touching any wiring.
2. Access — Remove the control/junction panel to reach the transformer and relay.
3. Document — Photograph the primary (120V) and secondary (24V) connections before disconnecting.
4. Remove — Disconnect the leads, unbolt the transformer from its mounting bracket, and remove it.
5. Install — Mount the new L01F009 transformer, reconnect the primary and secondary leads per your photos, and replace any blown low-voltage fuse.
6. Test — Restore power and confirm a steady 24V output at the secondary and normal thermostat/control operation.

Signs You Need a Replacement

• Blank or dead thermostat with no 24V control power
• System won't respond to heat or cool calls
• Repeatedly blown low-voltage control fuse
• Burnt smell, scorching, or buzzing from the transformer

Shipping & Returns

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