ICP 40VA Transformer for WFMR045A024B2 — 120/24V Control | Ships Today
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Overview
This OEM control transformer (part 1177217) steps the furnace's 120V line power down to the 24V low-voltage control circuit on the ICP Tempstar/Heil WFMR045A024B2. Rated at 40VA, it powers the thermostat, control board, gas valve, and relays. When a transformer fails — usually from a shorted control wire or a stuck contactor drawing excess current — the entire low-voltage system goes dead: the thermostat screen is blank, the furnace will not respond to a heat or cool call, and nothing energizes even though 120V is present at the unit. A blown transformer is a common cause of a completely unresponsive system, and it often blows again immediately if the underlying 24V short is not corrected first.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1177217 |
| Type | Control Transformer |
| Rating | 40 VA |
| Primary Voltage | 120V |
| Secondary Voltage | 24V |
| Brand | ICP (Tempstar / Heil / Comfortmaker) |
| Fitment | OEM — Model WFMR045A024B2 |
Compatibility
Direct OEM replacement for the 40VA 120-to-24V control transformer in the ICP Tempstar/Heil WFMR045A024B2 furnace. The same transformer is used across many ICP-built furnaces and air handlers sold under the Tempstar, Heil, Comfortmaker, and Arcoaire labels. Verify primary voltage (120V) and VA rating before installing.
Installation Guide
- Safety First — Disconnect power at the switch and breaker. Verify zero voltage with a multimeter.
- Access — Remove the furnace control-area access panel.
- Document — Photograph the primary and secondary lead connections before disconnecting.
- Remove — Check for and correct any 24V short, then unscrew the transformer mount and disconnect its leads.
- Install — Mount the new transformer and reconnect primary (120V) and secondary (24V) leads per your photo.
- Test — Restore power, measure 24V at the secondary, and confirm the thermostat and controls energize normally.
Signs You Need a Replacement
- Blank thermostat and completely dead low-voltage controls
- No 24V measured at the control board with 120V present
- Furnace does not respond to any heat or cool call
- Burnt smell or visible scorching on the transformer body
Shipping & Returns
Ships same day before 3 PM CST. 30-day returns. National HVAC Parts fitment guarantee.
Shipping Information
- Orders placed before 3PM CST ship same business day
- Standard delivery: 2-5 business days
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Return Policy
- 30-day returns on unused parts in original packaging
- Electrical parts (capacitors, contactors, control boards) are final sale once installed
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