ICP Transformer for WJH436000KTP0A1 — 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 WJH436000KTP0A1 heat pump. The transformer steps line voltage of 208/230V down to the 24V control circuit that feeds the thermostat, contactor coil, reversing valve solenoid, and defrost board. A failed transformer kills the entire low-voltage control system — the thermostat goes blank, the contactor never energizes, and the unit looks dead even with full high-voltage power 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 WJH436000KTP0A1 heat pump and shared platform units sold under the ICP, Tempstar, Heil, and Comfortmaker labels. Confirm your existing transformer is rated 208/230V to 24V at 40VA before installing.
Installation Guide
- Safety First — Disconnect power at the breaker and 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.
- Remove — Label and disconnect the line-voltage primary leads and the 24V secondary leads, then unbolt the failed transformer.
- Install — Mount the new transformer, reconnect the primary to matching line voltage and the secondary to the 24V circuit per your photo.
- Test — Restore power and confirm 24V across the secondary 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 a buzzing transformer
- Contactor or reversing valve fails to energize on a call
- 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