ICP 40VA Transformer for WJH448000KTP0A1 — 208/230V to 24V | Ships Today
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Overview
This OEM 40VA control transformer supplies the 24V low-voltage power for the ICP / Tempstar / Heil WJH448000KTP0A1 heat pump system. It converts the incoming 208/230V line voltage down to the 24V signal that drives the thermostat circuit, contactor coil, and reversing valve solenoid. A failed transformer kills the entire control circuit — the system stays silent on a thermostat call even with full line voltage present. This assembly group also includes the reversing valve coil (1172619), the reversing valve with coil (1175622), and the 24V barrier (1176032) powered by the transformer. Typical failure symptoms include a buzzing or dead transformer, a repeatedly blown low-voltage fuse, and intermittent control lockouts. A genuine OEM unit ensures the correct VA rating and lead layout so the control circuit gets clean, stable 24V.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1173691 |
| Associated Parts | 1176032, 1172619, 1175622 |
| Type | Control Transformer |
| Brand | ICP (Tempstar / Heil) |
| Primary Voltage | 208/230V |
| Secondary Voltage | 24V |
| Rating | 40VA |
Compatibility
Engineered as the factory-spec transformer for the ICP / Tempstar / Heil model WJH448000KTP0A1 heat pump and air handler combination, and the wider WJH family sharing this 208/230V control design. Confirm your unit's primary voltage matches before installing.
Installation Guide
- Safety First — Disconnect power at the breaker and disconnect, then verify zero voltage with a multimeter at the control terminals.
- Access — Remove the control-box service panel.
- Document — Photograph all primary and secondary lead connections before disconnecting.
- Remove — Disconnect the line-voltage primary leads and 24V secondary leads, then unbolt the transformer from its bracket.
- Install — Mount the new transformer and reconnect primary to line voltage and secondary to the 24V circuit per your photo.
- Test — Restore power and verify a steady 24V across the secondary and correct system response to a thermostat call.
Signs You Need a Replacement
- No 24V at the secondary while the primary has line voltage
- Repeatedly blown low-voltage control fuses
- Buzzing, overheating, or a burnt smell from the transformer
- System unresponsive to thermostat calls despite full line power
Shipping & Returns
Ships same day on orders placed 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