Tempstar Transformer for TNK100J16A1 — 40VA 115V to 24V | Ships Today
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Overview
This OEM control transformer (part number 1011626) steps down 115V line voltage to the 24V control voltage that runs your Tempstar furnace's thermostat, gas valve, ignition control, and relays. Rated at 40VA, it supplies the low-voltage power the control board needs to operate the entire sequence of operation. When a transformer fails, the symptoms are unmistakable: a completely dead thermostat, no response when you call for heat, blown low-voltage fuses, or a burnt-electrical smell near the control box. A failed transformer almost always means no 24V at the control board and no system operation at all.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1011626 |
| Description | Transformer 115V to 24V |
| Type | Step-Down Control Transformer |
| Brand | Tempstar (ICP / Heil) |
| Primary Voltage | 115V |
| Secondary Voltage | 24V |
| Rating | 40VA |
| Fitment | OEM Replacement |
Compatibility
Direct OEM fit for the Tempstar TNK100J16A1 gas furnace and shared across many ICP-family platforms including Tempstar, Heil, Comfortmaker, and other ICP-built furnaces and air handlers that use a 40VA 115-to-24V control transformer. Always confirm against your unit's existing transformer rating and mounting before installing.
Installation Guide
- Safety First — Disconnect power at the furnace switch and breaker, then verify zero voltage with a multimeter at the transformer leads.
- Access — Remove the furnace service/blower panel to reach the control box.
- Document — Photograph every wire on the primary (line) and secondary (24V) sides before disconnecting.
- Remove — Disconnect the primary and secondary leads, then unbolt the transformer from its mounting bracket or control panel.
- Install — Mount the new transformer, reconnect primary to line voltage and secondary to the 24V common/hot per your photo.
- Test — Restore power and confirm 24V across the secondary terminals, then run a heat cycle.
Signs You Need a Replacement
- Thermostat screen is dead or the system won't power on.
- Repeatedly blowing the low-voltage (3A) control fuse.
- No 24V reading across the transformer secondary.
- Buzzing, overheating, or a burnt smell from the transformer.
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
- 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