ICP 40VA Transformer for WPG3604115LKC1 — 208/230V to 24V | Ships Today
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Overview
This genuine OEM 40VA control transformer (part number 1173691) with its matching 24V barrier (part number 1178431) steps line voltage down to the low-voltage control circuit on the ICP/Tempstar/Heil WPG3604115LKC1. It accepts a 208/230V primary and delivers a 24V, 40VA secondary that powers the thermostat, gas valve, relays, and control board. When the transformer fails — usually from a shorted secondary, overload, or age — the entire control system goes dead: no thermostat display, no relay action, and no heating or cooling response. The included barrier provides the required insulation and terminal protection for the low-voltage connections.
Specifications
| Spec | Value |
|---|---|
| Part Numbers | 1173691 (Transformer), 1178431 (24V Barrier) |
| Type | Step-Down Control Transformer |
| Brand | ICP / Tempstar / Heil |
| Primary Voltage | 208/230V |
| Secondary Voltage | 24V |
| Rating | 40VA |
| Fit | OEM Replacement |
Compatibility
Direct-fit OEM replacement for the ICP WPG3604115LKC1 packaged unit and related Tempstar, Heil, and Comfortmaker systems that use a 208/230V-to-24V 40VA control transformer. Confirm primary/secondary voltages and VA rating against your existing transformer before ordering.
Installation Guide
- Safety First — Disconnect power at the disconnect and thermostat, and verify zero voltage with a multimeter.
- Access — Remove the control/electrical access panel.
- Document — Photograph all primary and secondary leads and the barrier position before disconnecting.
- Remove — Disconnect the primary and 24V secondary wiring, then unbolt the transformer from its bracket.
- Install — Mount the new transformer, fit the 24V barrier, and reconnect the primary to the correct voltage tap and the secondary to the control circuit per your photo.
- Test — Restore power and confirm 24V at the secondary, then verify thermostat and control response.
Signs You Need a Replacement
- No 24V at the control circuit / dead thermostat
- Furnace and control board completely unresponsive
- Repeated blown low-voltage fuse or tripped control
- Burnt smell or visible scorching on the transformer
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