ICP Transformer for WAHM244A2 — 40VA 208/230V to 24V | Ships Today
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Overview
This is an OEM control transformer (part number 1172028) for the ICP WAHM244A2 fan coil / air handler. The transformer steps down 208/230V line power to the 24V low-voltage control circuit that powers the thermostat, relays, and control board. Rated at 40VA, it delivers the regulated current your low-voltage components require to operate reliably. A failed transformer kills the entire 24V circuit — the thermostat goes blank, the system stops responding to heat or cool calls, and contactors and relays no longer energize. Buzzing, a repeatedly blown low-voltage fuse, or a zero reading on the secondary terminals all point to transformer failure.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1172028 |
| Type | Step-Down Control Transformer |
| Brand | ICP (Tempstar / Heil) |
| Primary Voltage | 208/230V |
| Secondary Voltage | 24V |
| Rating | 40VA |
| Fitment | OEM Direct Replacement |
Compatibility
Engineered as a direct-fit replacement for the ICP WAHM244A2 air handler. This 40VA 208/230-to-24V transformer is also used across many ICP-family fan coils and furnaces sold under the Tempstar, Heil, and Comfortmaker labels. Confirm OEM part number 1172028 against the transformer in your unit before ordering.
Installation Guide
- Safety First — Disconnect power at the breaker and verify zero voltage with a multimeter before touching any wiring.
- Access — Remove the service panel to expose the control compartment.
- Document — Photograph all primary and secondary lead connections before disconnecting anything.
- Remove — Disconnect the primary (line) and secondary (24V) leads, then unbolt the failed transformer from its bracket.
- Install — Mount the new transformer, matching the 208/230V tap to your supply voltage, and reconnect the leads exactly per your photos.
- Test — Restore power and confirm 24V across the secondary terminals and normal thermostat operation.
Signs You Need a Replacement
- Blank thermostat or completely dead 24V control circuit
- System will not respond to heat or cool calls
- Repeatedly blown low-voltage fuse
- Audible buzzing or no measurable 24V output on the 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