Tempstar 40VA Transformer for TCH624GKA300 — 208/230V to 24V | Ships Today
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Overview
This OEM 40VA control transformer (part number 1170676) provides the 24V low-voltage power that runs the control circuit on your Tempstar TCH624GKA300 heat pump. It steps incoming 208/230V line voltage down to 24V to feed the thermostat, contactor coil, reversing valve coil, and control board. On a heat pump like the TCH624GKA300, a failed transformer leaves the reversing valve, defrost control, and compressor contactor without power — so the unit will not heat, cool, or switch modes. A buzzing transformer, a tripped or blown low-voltage fuse, or a system that has line power but no thermostat response all point to this part.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1170676 |
| Type | Control / Step-Down Transformer |
| Brand | Tempstar (ICP / Heil) |
| Rating | 40 VA |
| Primary Voltage | 208/230V |
| Secondary Voltage | 24V |
| Related Components | Reversing valve coil 1172574, valve w/ coil 1173715 |
| Fitment | OEM Replacement |
Compatibility
A direct OEM replacement for the Tempstar TCH624GKA300 heat pump. As a genuine ICP/Heil-family transformer, the 1170676 also serves many other Tempstar, Heil, Comfortmaker, and ICP systems. This model's 24V circuit also drives the reversing valve coil (1172574) and reversing valve assembly (1173715) — verify your existing part number before ordering.
Installation Guide
- Safety First — Disconnect power at the breaker and service disconnect, then verify zero voltage with a multimeter.
- Access — Remove the unit's electrical service panel to reach the control box.
- Document — Photograph every primary and secondary wire connection before disconnecting.
- Remove — Label and disconnect the line-voltage primary leads and the 24V secondary leads, then unbolt the old transformer.
- Install — Mount the new 1170676 transformer and reconnect all wiring exactly as photographed.
- Test — Restore power and confirm 24V on the secondary plus proper reversing-valve and contactor response.
Signs You Need a Replacement
- No 24V at the thermostat, reversing valve coil, or control board
- Repeatedly blown or tripped low-voltage fuses
- Audible buzzing or a burnt smell from the transformer
- Heat pump won't switch between heating and cooling modes
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