ICP 40VA Transformer for WJH348000KTP0A2 — 208/230V to 24V | Ships Today
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Overview
This genuine OEM control transformer (part #1173691) steps 208/230V line voltage down to 24V, powering the thermostat, contactor coil, reversing valve coil, and other low-voltage controls on ICP, Heil, and Tempstar systems like the WJH348000KTP0A2. Rated at 40VA, it delivers the current needed to run the complete 24V control circuit on this heat pump platform. Transformers typically fail from a shorted control wire, a stuck contactor coil pulling excess current, or a voltage surge. When the transformer opens, the entire low-voltage circuit dies — you'll see a blank thermostat, an outdoor unit that won't start, or a transformer that buzzes, overheats, or smells burnt.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1173691 |
| Type | Step-Down Control Transformer |
| Brand | ICP / Heil / Tempstar |
| Power Rating | 40 VA |
| Primary Voltage | 208/230V |
| Secondary Voltage | 24V |
| Fitment | OEM Replacement |
Compatibility
Direct OEM replacement for the ICP/Heil/Tempstar WJH348000KTP0A2 and related WJH348000 series heat pumps specifying a 40VA 208/230V-to-24V transformer. This model's control assembly also includes the reversing valve coil (#1172619), reversing valve with coil (#1172618), and 24V barrier (#1176032). Verify primary voltage and VA rating before ordering.
Installation Guide
- Safety First — Disconnect power at the disconnect and breaker, then verify zero voltage with a multimeter before touching any wiring.
- Access — Remove the control-box service panel.
- Document — Photograph all primary and secondary leads and their terminal locations.
- Remove — Disconnect the 208/230V primary leads and the 24V secondary leads, then unmount the failed transformer.
- Install — Mount the new transformer, matching primary leads to line voltage and secondary leads 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
- Blank or dead thermostat with line power present
- Outdoor unit and contactor won't energize on a call for cooling
- No measurable 24V at the secondary terminals
- Transformer buzzes, overheats, or has a burnt odor
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