ICP Transformer for WPG3604130LKC1 – 40VA 208/230V to 24V | Ships Today
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Overview
This OEM ICP control transformer (part #1173691) steps down 208/230-volt line power to the 24-volt low-voltage control signal that runs the thermostat, contactor coil, ignition control, and gas valve on your WPG3604130LKC1 system. Rated at 40VA, it delivers the steady control current the board demands during a heating or cooling call. A failed transformer is one of the most common no-heat / no-cool callbacks: when it burns open or shorts, the entire 24V control circuit goes dead — the thermostat screen blanks, the contactor never pulls in, and the furnace will not ignite. Buzzing, a scorched smell, or a tripped low-voltage fuse are classic signs the transformer has failed. This assembly also includes the matching 24V barrier (#1178431) for a complete control-power replacement.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1173691 (Transformer), 1178431 (24V Barrier) |
| Type | Control Transformer |
| Brand | ICP / Tempstar / Heil |
| Rating | 40 VA |
| Primary Voltage | 208/230V |
| Secondary Voltage | 24V |
| Fit | OEM Replacement |
Compatibility
Engineered as a direct-fit replacement for the ICP Tempstar Heil model WPG3604130LKC1 packaged unit and other ICP-family equipment using a 208/230V-to-24V 40VA control transformer. Always confirm your existing transformer's VA rating and voltage taps against this part before installing.
Installation Guide
- Safety First – Disconnect power at the breaker and unit disconnect, then verify zero voltage with a multimeter on the line terminals.
- Access – Remove the control-access service panel to expose the transformer and control board.
- Document – Photograph all primary and secondary leads before disconnecting anything.
- Remove – Note the line-voltage tap in use (208 vs 230), disconnect primary and secondary leads, and unbolt the old transformer from its bracket.
- Install – Mount the new transformer, land the primary on the matching voltage tap, and reconnect the 24V secondary per your photo.
- Test – Restore power, confirm 24V across the secondary, and verify the thermostat powers up and the system responds to a call.
Signs You Need a Replacement
- No 24V at the thermostat — blank screen or dead controls
- Repeatedly blown low-voltage control fuse
- Audible buzzing or a burnt smell from the transformer
- Contactor and ignition control fail to energize on a call
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