Tempstar 40VA Transformer for TCH924GKA300 — 208/230V to 24V | Ships Today
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Overview
This genuine OEM 40VA control transformer (part number 1170676) provides the 24V control power for the Tempstar TCH924GKA300 heat pump. It steps 208/230V line voltage down to the 24V used by the thermostat, contactor coil, defrost control board, and the reversing valve solenoid circuit. On a heat pump like the TCH924GKA300, that 24V also energizes the reversing valve coil (companion OEM parts 1172574 and 1173715) that switches the system between heating and cooling. A failed transformer leaves the entire low-voltage system dead — no thermostat, no call, and no reversing valve action. Installing the correct 40VA OEM transformer restores full control-circuit power.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1170676 |
| Type | Step-down control transformer |
| Brand | Tempstar (ICP / Heil family) |
| Rating | 40 VA |
| Primary Voltage | 208/230V |
| Secondary Voltage | 24V |
| Related Parts | 1172574 (rev valve coil 24V), 1173715 (rev valve w/coil 24V) |
| Fit | OEM direct replacement |
Compatibility
A direct-fit replacement for the Tempstar TCH924GKA300 heat pump. The shared ICP/Tempstar/Heil/Comfortmaker platform means this 40VA 208/230V-to-24V transformer also services many equivalent models across those brands. Confirm part number 1170676 and your primary voltage tap before ordering.
Installation Guide
- Safety First — Disconnect power at the disconnect and breaker, and verify zero voltage with a multimeter.
- Access — Remove the control/service panel to expose the transformer and its wiring.
- Document — Photograph the primary/secondary connections and the voltage tap in use.
- Remove — Disconnect the primary and secondary leads, then unbolt the transformer from its bracket.
- Install — Mount the new transformer, land the primary on the matching 208 or 230V tap, and reconnect the 24V secondary per your photo.
- Test — Restore power and confirm ~24V on the secondary plus a working thermostat, contactor, and reversing valve call.
Signs You Need a Replacement
- Dead thermostat with no 24V control power
- No response to any heating, cooling, or defrost call
- Reversing valve won't shift and contactor won't pull in
- Repeatedly blown low-voltage fuse or burnt transformer odor
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