Tempstar Transformer for T9MPV075F12A1 — 40VA 115V to 24V | Ships Today
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Overview
This OEM 40VA control transformer (part #1012722) supplies low-voltage power to the control circuit of your Tempstar T9MPV075F12A1 gas furnace. It steps down 115V line voltage to the 24V required by the control board, gas valve, igniter circuit, blower controls, and thermostat. When a transformer fails, the entire furnace control system loses power: the thermostat goes blank, the furnace will not respond to a call for heat, and no ignition sequence begins. A buzzing sound, a blown low-voltage fuse on the control board, or zero reading across the 24V secondary terminals all point to a failed transformer. Rated at 40VA, this unit provides ample capacity for the furnace's full control load.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1012722 |
| Type | Control Transformer |
| Brand | Tempstar (ICP / Heil) |
| Rating | 40VA |
| Primary Voltage | 115V |
| Secondary Voltage | 24V |
Compatibility
Engineered as a direct OEM replacement for the Tempstar T9MPV075F12A1 variable-speed gas furnace. This transformer is also shared across many ICP-family furnaces (Tempstar, Heil, Comfortmaker) using the same 115V-to-24V 40VA control circuit. Always verify the part number against your existing unit before installing.
Installation Guide
- Safety First — Disconnect power at the furnace switch and breaker. Verify zero voltage with a multimeter at the transformer terminals.
- Access — Remove the furnace blower-compartment service panel to reach the control area.
- Document — Photograph all primary (line) and secondary (24V) wire connections before disconnecting.
- Remove — Disconnect the primary and secondary leads, then unbolt the failed transformer from its mounting bracket.
- Install — Mount the new transformer, reconnect primary and secondary leads exactly per your photo.
- Test — Restore power, confirm 24V across the secondary, and run a full heat cycle to verify operation.
Signs You Need a Replacement
- Blank thermostat and no furnace response to a heat call
- Repeatedly blown 3-amp control-board fuse
- Buzzing or humming from the transformer
- No 24V reading across the secondary terminals
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