ICP 24V Control Transformer for WCH3484GKB1 — 40VA Class 2 | Ships Today
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Overview
This OEM 24-volt control transformer supplies the low-voltage power that runs the thermostat, contactor coil, reversing valve solenoid, and control circuit on the ICP/Tempstar/Heil WCH3484GKB1 heat pump system. It steps line voltage down to a stable 24V Class 2 output rated at 40VA. When a transformer fails — usually from a shorted control wire, a stuck contactor coil drawing excess current, or age — the entire low-voltage side goes dead: no thermostat display, no contactor pull-in, and no system response to a call for heat or cool. A clicking or buzzing transformer, or one that runs hot to the touch, is a sign it's on the way out.
Specifications
| Spec | Value |
|---|---|
| Type | Step-Down Control Transformer (Class 2) |
| Brand | ICP (Tempstar / Heil) |
| Secondary Voltage | 24V |
| Rating | 40VA |
| Application | Low-voltage control circuit |
| Related OEM Parts | 1172574, 1175622 |
| Fitment | OEM direct replacement |
Compatibility
Direct-fit for the ICP WCH3484GKB1 heat pump and related WCH3484 series units sold under ICP, Tempstar, Heil, and Comfortmaker. Confirm primary line voltage and the 24V/40VA rating against the unit's wiring diagram before installing.
Installation Guide
- Safety First — Disconnect power at the breaker and disconnect. Verify zero voltage at the transformer primary leads with a multimeter.
- Access — Remove the control panel cover to reach the transformer.
- Document — Photograph the primary (line) and secondary (24V) wire connections before removing anything.
- Remove — Disconnect the primary and secondary leads, then unbolt the transformer from its mounting.
- Install — Mount the new transformer and reconnect the primary and secondary wiring exactly per your photo.
- Test — Restore power and confirm 24V across the secondary terminals, then verify the thermostat and contactor energize on a call.
Signs You Need a Replacement
- Dead thermostat / no low-voltage power at the control board.
- Transformer buzzes, hums loudly, or runs visibly hot.
- System won't respond to a heat or cool call despite line power present.
- No 24V measured across the secondary with the unit powered.
Shipping & Returns
Ships same day on orders placed before 3 PM CST. 30-day hassle-free 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