ICP Transformer for WPG3304040LKC1 — 208/230V to 24V 40VA | Ships Today
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Overview
This OEM control transformer steps down line voltage (208/230V) to the 24V control voltage that powers your ICP WPG3304040LKC1 system's thermostat, control board, contactor coil, and gas valve. Rated at 40VA, it supplies the low-voltage circuit that virtually every safety and operating control depends on. When a control transformer fails, the entire 24V circuit goes dead: the thermostat screen goes blank, the contactor will not pull in, and the unit appears completely unresponsive even though line voltage is present. This package also includes the matching 24V barrier (OEM 1178431) for proper terminal isolation. Common failure causes are a shorted thermostat wire, a failed contactor coil, or age-related winding breakdown — always correct the underlying short before installing a new transformer or it will fail again.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1173691 (transformer), 1178431 (24V barrier) |
| Type | Control / Step-Down Transformer |
| Brand | ICP (Tempstar / Heil) |
| Rating | 40 VA |
| Primary Voltage | 208 / 230 V |
| Secondary Voltage | 24 V |
| Fit | OEM Replacement |
Compatibility
Engineered for the ICP / Tempstar / Heil WPG3304040LKC1 packaged unit and other ICP-family equipment using a 208/230V-to-24V 40VA control transformer. Always confirm your existing transformer's VA rating and voltage taps match before installing.
Installation Guide
- Safety First — Disconnect power at the breaker and disconnect switch, then verify zero voltage with a multimeter at the transformer terminals.
- Access — Remove the control/electrical access panel.
- Document — Photograph all primary and secondary wire connections before disconnecting.
- Remove — Label and disconnect the line-voltage primary leads and the 24V secondary leads, then unbolt the failed transformer from its mounting bracket.
- Install — Mount the new transformer, install the 24V barrier, and reconnect every lead to match your photo, confirming the correct voltage tap.
- Test — Restore power and verify 24V across the secondary terminals and proper system response.
Signs You Need a Replacement
- No 24V output measured across the secondary terminals.
- Blank thermostat and a completely unresponsive control circuit.
- Repeatedly blown low-voltage fuse or a buzzing/overheating transformer.
- Burnt smell or visible scorching on the transformer body.
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