ICP Transformer for WPG4244040RKB1 — 40VA 208/230V to 24V | Ships Today
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Overview
This OEM 40VA control transformer steps the incoming 208/230V line voltage down to the 24V control voltage that powers your ICP WPG4244040RKB1 thermostat circuit, contactor coil, gas valve, and ignition control. When a transformer fails, the entire low-voltage control system goes dead — the thermostat screen goes blank, the contactor will not pull in, and the unit appears completely unresponsive even though high-voltage power is present. A buzzing transformer, a tripped low-voltage fuse, or a melted/discolored secondary winding are classic signs of failure, often caused by a shorted thermostat wire or a stuck contactor drawing excess current. This kit includes OEM part 1173691 (TRANS 208/230>24 40VA) and the matching 24V barrier 1178431.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1173691 / 1178431 |
| Type | Control Transformer |
| Brand | ICP / Heil / Tempstar |
| Rating | 40 VA |
| Primary Voltage | 208/230V |
| Secondary Voltage | 24V |
| Fit | OEM |
Compatibility
Designed as a direct OEM replacement for the ICP/Heil/Tempstar/Comfortmaker WPG4244040RKB1 packaged unit. Also fits many ICP-family models that use a 40VA 208/230-to-24V class 2 control transformer. Verify primary and secondary voltage against the transformer you are replacing.
Installation Guide
- Safety First — Disconnect power at the disconnect and breaker, then verify zero voltage with a multimeter at the transformer primary.
- Access — Remove the control/electrical service panel.
- Document — Photograph all primary and secondary wire connections before disconnecting.
- Remove — Disconnect the line-voltage primary leads and the 24V secondary leads, then unbolt the old transformer from the bracket.
- Install — Mount the new transformer, reconnect primary to matching line voltage and secondary to the 24V circuit per your photo.
- Test — Restore power and confirm 24V (±10%) across the secondary and that the control circuit energizes.
Signs You Need a Replacement
- Blank thermostat and dead low-voltage controls with line power present.
- Repeatedly blown low-voltage fuse or open secondary winding.
- Audible buzzing, overheating, or a burnt-electrical smell at the transformer.
- No 24V output measured across the secondary terminals.
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