ICP Transformer for WAHM364B1 - 40VA 208/230V to 24V Step-Down | Ships Today
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Overview
This OEM control transformer (part #1172028) is the low-voltage power source for your ICP WAHM364B1 fan coil air handler. It steps down 208/230V line power to the 24V control voltage that runs the thermostat, control board, relays, and contactor coil. Rated at 40VA, it delivers enough current to drive the full 24V control circuit without overheating. When a transformer fails, the entire low-voltage side goes dead: the thermostat screen blanks, the blower will not start, and no 24V is present at the control board. Common failure causes are a shorted thermostat wire, a stuck contactor, a power surge, or simple age-related winding breakdown. A blown internal fuse link or a burnt smell at the transformer is a clear sign of 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 |
| Fit | OEM Direct Replacement |
Compatibility
Direct OEM fit for the ICP WAHM364B1 fan coil air handler and shared-platform Tempstar, Heil, and Comfortmaker WAHM-series units that use the 208/230V-to-24V 40VA control transformer. Always confirm your existing transformer is rated 40VA with 208/230V primary and 24V secondary before installing.
Installation Guide
- Safety First - Disconnect power at the breaker and verify zero voltage with a multimeter at both the line and 24V terminals.
- Access - Remove the air handler service panel to expose the control compartment.
- Document - Photograph all primary and secondary wire connections before disconnecting.
- Remove - Label and disconnect the line-voltage primary leads and the 24V secondary leads, then unbolt the failed transformer from its mounting bracket.
- Install - Mount the new transformer, reconnect primary to line voltage and secondary to the 24V control circuit exactly per your photo.
- Test - Restore power and confirm 24V across the secondary terminals and normal blower/thermostat operation.
Signs You Need a Replacement
- Thermostat is blank or unresponsive with line power confirmed present
- No 24V reading at the control board or transformer secondary
- Blower and controls completely dead while line voltage is good
- Burnt smell, discoloration, or a blown internal fuse link at the transformer
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