ICP Transformer for WPG4304040LKB1 — 40VA 208/230V to 24V | Ships Today
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Overview
This OEM control transformer (part 1173691) with its companion 24V barrier (part 1178431) supplies the low-voltage control power for the ICP / Tempstar / Heil WPG4304040LKB1 package unit. It steps the 208/230V line voltage down to the 24V secondary that drives the thermostat circuit, control board, contactor coil, gas valve, and pressure switch. Rated at 40VA, it provides the current headroom these loads require. When a transformer fails — usually from a shorted control wire, a failed coil, or age — the entire 24V system goes dead: no thermostat display, no contactor pull-in, no ignition. Installing the correct OEM transformer restores control power and protects downstream components.
Specifications
| Spec | Value |
|---|---|
| Part Numbers | 1173691 (Transformer), 1178431 (24V Barrier) |
| Type | Step-Down Control Transformer |
| Brand | ICP / Tempstar / Heil |
| Rating | 40 VA |
| Primary Voltage | 208/230V |
| Secondary Voltage | 24V |
Compatibility
Designed as the factory control-power replacement for the ICP WPG4304040LKB1 packaged system and used across many comparable ICP, Tempstar, Heil, and Comfortmaker units that specify a 40VA 208/230-to-24V transformer. Confirm the VA rating and primary/secondary voltages match your original before installing.
Installation Guide
- Safety First — Disconnect power at the breaker and unit disconnect, then verify zero voltage with a multimeter.
- Access — Remove the control-panel service cover.
- Document — Photograph the primary and secondary wiring before disconnecting.
- Remove — Label and disconnect the leads, then unbolt the transformer and barrier from the panel.
- Install — Mount the new transformer and barrier, then reconnect primary and secondary wires per your photo.
- Test — Restore power and verify 24V at the secondary and normal system operation.
Signs You Need a Replacement
- Dead thermostat with no display or no system response.
- No 24V reading at the secondary terminals.
- Contactor and gas valve will not energize on a call.
- Burned smell, scorched casing, or a blown control fuse that recurs.
Shipping & Returns
Ships same day before 3 PM CST. 30-day returns. Backed by the 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