ICP Transformer for WAHM242A1 — 40VA 208/230V to 24V | Ships Today
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Overview
This OEM 40VA control transformer (part number 1172028) steps 208/230V line voltage down to the 24V control voltage that powers your ICP WAHM242A1 air handler's thermostat, fan coil control board, relays, and contactor coils. When the transformer burns out, the entire low-voltage control circuit dies: the thermostat goes blank, the blower won't start, and there is no 24V at the control board. A humming or buzzing transformer, an open internal fuse link, or a scorched smell at the control box typically point to a transformer that has failed — often after a shorted control wire or a failed downstream component overloaded it.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1172028 |
| Type | Step-Down Control Transformer |
| Brand | ICP (Tempstar / Heil) |
| Rating | 40 VA |
| Primary Voltage | 208/230V |
| Secondary Voltage | 24V |
| Fit | OEM Replacement |
Compatibility
Designed as a direct-fit replacement for the ICP / Tempstar / Heil WAHM242A1 air handler. The 40VA, 208/230V-to-24V configuration is shared across many ICP-family fan coil and air handler models, but always verify the original part number 1172028 before ordering.
Installation Guide
- Safety First — Disconnect power at the breaker and verify zero voltage at the unit with a multimeter before touching any wiring.
- Access — Remove the air handler's electrical access panel to expose the control box.
- Document — Photograph the primary and secondary lead connections before disconnecting anything.
- Remove — Disconnect the primary (line) and secondary (24V) leads, then unbolt the transformer from the control panel bracket.
- Install — Mount the new transformer, match the 208/230V taps and 24V leads exactly to your photo, and confirm tight connections.
- Test — Restore power and confirm 24V across the secondary terminals and a powered-up thermostat.
Signs You Need a Replacement
- Blank thermostat and a completely dead low-voltage control circuit
- No 24V reading at the control board or thermostat terminals
- Buzzing, humming, or burnt smell coming from the transformer
- Repeated blown control fuses after a recent short
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