Tempstar Transformer for T9MPD050F12A2 – 40VA 115V to 24V | Ships Today
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Overview
This OEM 40VA control transformer (part #1012722) steps the incoming 115V line voltage down to the 24V control voltage required by your Tempstar T9MPD050F12A2 gas furnace. The transformer powers the thermostat circuit, gas valve, ignition control board, and relays. When a control transformer fails, the entire low-voltage system goes dead: the thermostat screen may go blank, the furnace will not respond to a call for heat, and you may find a blown fuse on the control board. A buzzing transformer, scorched windings, or zero volts on the 24V secondary terminals all indicate replacement is needed. This is a direct-fit factory replacement rated at 40VA with a 115V primary and 24V secondary.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1012722 |
| Type | Control Transformer |
| Brand | Tempstar |
| Rating | 40 VA |
| Primary Voltage | 115V |
| Secondary Voltage | 24V |
| Fitment | OEM |
Compatibility
Engineered for the Tempstar T9MPD050F12A2 gas furnace and shared across many ICP/Heil/Comfortmaker furnace platforms that use a 40VA 115-to-24V control transformer. Always confirm your primary voltage and VA rating against the failed unit before installing.
Installation Guide
- Safety First – Disconnect power at the furnace switch and breaker, then verify zero voltage with a multimeter.
- Access – Remove the furnace control/blower compartment service panel.
- Document – Photograph all primary and secondary wire connections before disconnecting.
- Remove – Disconnect the primary (line) and secondary (24V) leads, then unbolt the transformer from the bracket or panel.
- Install – Mount the new transformer, reconnect the primary and secondary leads exactly per your photo, and secure all terminals.
- Test – Restore power and verify 24V across the secondary terminals, then confirm the furnace responds to a heat call.
Signs You Need a Replacement
- Blank thermostat and no response to a call for heat
- Repeatedly blown low-voltage (3A) control board fuse
- Zero or low voltage reading across the 24V secondary terminals
- Audible buzzing, burning smell, or visibly scorched windings
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