ICP Transformer for RGS240HTFA0AAAA — 24V 40VA Control Power | Ships Today
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Overview
This is the genuine OEM 24V control transformer and relay assembly for the ICP / Heil / Tempstar RGS240HTFA0AAAA gas furnace. The transformer steps the incoming line voltage down to the 24-volt control signal that powers the furnace control board, thermostat, gas valve, and the included 24V relays (OEM 1183814 DPDT relay T92S11A22-24 and 1178205 DPST relay T92P7A22-24). Rated at 40VA, it delivers stable, regulated low-voltage power to the entire control circuit. When a transformer fails, the furnace goes completely dead at the thermostat — no call for heat, no blower, no ignition sequence — even though line power is present. A buzzing transformer, a tripped low-voltage fuse, or a melted secondary winding are classic signs of a failed unit, often caused by a shorted thermostat wire or a stuck relay coil drawing excess current.
Specifications
| Spec | Value |
|---|---|
| OEM Part Numbers | 1183814, 1178205 |
| Type | Step-Down Control Transformer w/ Relays |
| Brand | ICP / Heil / Tempstar |
| Secondary Voltage | 24V |
| Rating | 40VA |
| Relay 1 | 24V DPDT (T92S11A22-24) |
| Relay 2 | 24V DPST (T92P7A22-24) |
| Fitment | OEM Direct Replacement |
Compatibility
Engineered as a direct-fit replacement for the ICP RGS240HTFA0AAAA gas furnace and shared platform models across the Heil, Tempstar, and Comfortmaker family that use the same 40VA control transformer and 24V relay set. Always confirm the printed part number on your existing component before ordering.
Installation Guide
- Safety First — Disconnect power at the furnace switch and breaker, then verify zero voltage with a multimeter.
- Access — Remove the furnace control compartment service panel.
- Document — Photograph all primary and secondary wiring before disconnecting anything.
- Remove — Unplug the relay sockets, disconnect the transformer primary and secondary leads, and unbolt the assembly from the panel.
- Install — Mount the new transformer, seat the relays, and reconnect every lead exactly per your photo.
- Test — Restore power, confirm 24V across the secondary, and run a full heat cycle.
Signs You Need a Replacement
- Furnace is completely unresponsive at the thermostat
- Repeatedly blown low-voltage control fuse
- Audible buzzing, humming, or a burnt smell from the control box
- Relays chatter or fail to pull in during a call for heat
Shipping & Returns
Ships same day before 3 PM CST. 30-day returns. National HVAC Parts fitment guarantee.
Shipping Information
- Orders placed before 3PM CST ship same business day
- Standard delivery: 2-5 business days
- Express shipping available at checkout
- Free shipping on orders over $75
- Tracking number emailed upon shipment
Return Policy
- 30-day returns on unused parts in original packaging
- Electrical parts (capacitors, contactors, control boards) are final sale once installed
- Email info@nationalhvacparts.com to initiate a return
- Refunds processed within 5-7 business days