ICP Transformer for WJH442000KTP0A1 — 40VA 208/230V to 24V | Ships Today
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Overview
This is a genuine OEM 40VA control transformer (part #1173691) for the ICP/Tempstar/Heil WJH442000KTP0A1 heat pump. The transformer steps down line voltage of 208/230V down to the 24V control circuit that powers the thermostat, contactor coil, reversing valve solenoid, and defrost board. When a transformer fails, the entire low-voltage control system goes dead — the thermostat screen blanks, the contactor will not pull in, and the unit appears completely unresponsive even though high-voltage power is present at the disconnect. This combo listing also includes the related 24V reversing-valve coil (1172619), the reversing valve with coil (1175621), and the barrier (1176032) used on this model.
Specifications
| Spec | Value |
|---|---|
| Primary OEM Part Number | 1173691 (TRANS 208/230>24 40VA) |
| Included Part Numbers | 1176032, 1172619, 1173691, 1175621 |
| Type | Step-Down Control Transformer |
| Brand | ICP / Tempstar / Heil |
| Rating | 40 VA |
| Primary Voltage | 208/230V |
| Secondary Voltage | 24V |
Compatibility
Engineered as a direct-fit OEM replacement for the ICP family WJH442000KTP0A1 heat pump and shared platform units sold under the ICP, Tempstar, Heil, and Comfortmaker labels. Always confirm your existing transformer matches the 208/230V to 24V, 40VA rating before installing.
Installation Guide
- Safety First — Disconnect power at the breaker and the outdoor disconnect, then verify zero voltage with a multimeter.
- Access — Remove the service panel to expose the control box.
- Document — Photograph all primary and secondary wire connections before disconnecting anything.
- Remove — Label and disconnect the line-voltage primary leads and the 24V secondary leads, then unbolt the failed transformer from the control panel.
- Install — Mount the new transformer, reconnect the primary to matching line voltage and the secondary to the 24V circuit exactly per your photo.
- Test — Restore power and confirm 24V across the secondary terminals and normal thermostat/contactor operation.
Signs You Need a Replacement
- No 24V at the control board or thermostat despite high-voltage power present
- Repeatedly blown low-voltage fuse or buzzing/humming transformer
- Contactor or reversing valve fails to energize on a call for cooling/heating
- Visible scorching, swelling, or a burnt smell at 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