ICP 40VA Transformer for WJH348000KTP0A1 — 208/230V to 24V | Ships Today
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Overview
This OEM control transformer (part #1173691) is a 40VA step-down transformer with a 208/230-volt primary and a 24-volt secondary, built for the ICP WJH348000KTP0A1 heat pump. The transformer converts incoming line voltage into the 24V control power that runs the thermostat, contactor coil, reversing valve solenoid, and the rest of the low-voltage circuit. When a transformer fails — often from a shorted reversing valve coil or a wiring short overloading the secondary — the entire control side goes dead: no thermostat display, no contactor pull-in, and no system operation. A buzzing transformer, a repeatedly blown low-voltage fuse, or zero volts across the secondary all point to replacement. This listing covers the transformer for the WJH348000KTP0A1 control package, which also includes the reversing valve coil (1172619), reversing valve with coil (1172618), and 24V barrier (1176032).
Specifications
| Spec | Value |
|---|---|
| OEM Part Number | 1173691 |
| Type | Control / Step-Down Transformer |
| Brand | ICP / Heil / Tempstar |
| Rating | 40 VA |
| Primary Voltage | 208 / 230 VAC |
| Secondary Voltage | 24 VAC |
| Related Parts | 1176032 barrier, 1172619 rev valve coil, 1172618 rev valve w/ coil |
Compatibility
Direct factory replacement for the ICP / Heil / Tempstar / Comfortmaker WJH348000KTP0A1 packaged heat pump. The 40VA 208/230-to-24V rating is a common control-power spec across many residential heat pumps and air handlers — verify your primary tap and VA rating against the failed unit before installing.
Installation Guide
- Safety First — Disconnect power at the breaker and disconnect, then verify zero voltage with a multimeter on both the primary and secondary leads.
- Access — Remove the control-panel cover to expose the transformer and low-voltage terminal block.
- Document — Photograph the primary tap (208 vs 230) and every secondary wire before disconnecting.
- Remove — Disconnect the leads, unbolt the transformer from the panel, and check for the short that may have caused the failure.
- Install — Mount the new transformer, land the primary on the correct voltage tap, and reconnect the 24V secondary per your photo.
- Test — Restore power and confirm 24V across the secondary and a normal thermostat call.
Signs You Need a Replacement
- No 24V control power — dead thermostat, no contactor pull-in
- Repeatedly blown low-voltage fuse or breaker
- Audible buzzing or burnt smell from the transformer
- Zero or low voltage measured across the 24V secondary
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