What are the specs for this Transformer?

The correct replacement for Tempstar model TCA948GKA100 — 208/230V to 24V | Ships Today is this exact part. It is the factory-specified replacement with exact OEM specifications. Using a part with different specifications can cause equipment damage or void your warranty. You can verify this by checking the data plate on your Tempstar equipment which lists the model number TCA948GKA100 — 208/230V to 24V | Ships Today.

Is this transformer compatible with Bryant or Payne systems too?

Many Tempstar parts are cross-compatible with Bryant and Payne systems since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across multiple brand labels with different model numbers. To verify cross-compatibility, check your Bryant or Payne equipment service manual for cross-compatible part numbers, or contact info@nationalhvacparts.com with your model number for confirmation.

Tempstar

Tempstar 40VA Transformer for TCA948GKA100 — 208/230V to 24V | Ships Today

Name: Tempstar 40VA Transformer for TCA948GKA100 — 208/230V to 24V | Ships Today
Brand: Tempstar
SKU: 1170676-GEN
Price: 28.95 USD
Availability: InStock

SKU: 1170676-GEN Brand: Tempstar

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Overview

This genuine OEM control transformer (part number 1170676) steps line voltage down from 208/230V to 24V and is rated at 40VA for the Tempstar TCA948GKA100 unit. The transformer is the heart of the low-voltage control circuit — it powers the thermostat, contactor coil, relays, and safety switches. When a transformer fails (often from a control short or surge), the entire 24V system goes dead: the thermostat blanks, the contactor will not pull in, and the system cannot start. The 40VA rating provides enough capacity for the standard control load with margin for accessories. Replacing the failed transformer restores full control power and reliable operation.

Specifications

Spec	Value
Part Number	1170676
Type	Step-Down Control Transformer
Brand	Tempstar
Rating	40VA
Primary Voltage	208/230V
Secondary Voltage	24V
Fits Model	TCA948GKA100

Compatibility

Designed for the Tempstar TCA948GKA100 and equivalent ICP-family units (Heil, Comfortmaker, Arcoaire) using a 40VA 208/230V-to-24V transformer. Confirm VA rating and primary/secondary voltages against your original.

Installation Guide

Safety First — Disconnect power and verify zero voltage with a multimeter.
Access — Remove the electrical access panel.
Document — Photo all primary and secondary leads before disconnecting.
Remove — Disconnect the line-voltage primary leads and the 24V secondary leads, then unbolt the old transformer.
Install — Mount the new transformer, matching the correct primary tap (208 vs 230V), and reconnect per your photo.
Test — Restore power and confirm 24V at the secondary and proper control operation.

Signs You Need a Replacement

Thermostat is blank and the system is completely dead at low voltage.
No 24V reading across the secondary terminals.
Contactor and relays will not energize.
Burned smell or visibly scorched transformer body.

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

Tempstar 40VA Transformer for TC...

$28.95

Frequently Asked Questions

Does this Transformer fit my Tempstar TCA948GKA100 — 208/230V to 24V | Ships Today?

Yes. This is the factory-specified OEM transformer for the Tempstar TCA948GKA100 — 208/230V to 24V | Ships Today. It is a direct drop-in replacement that fits without modification. Always verify the model number on your equipment nameplate before ordering.

How do I replace the transformer on my Tempstar TCA948GKA100 — 208/230V to 24V | Ships Today?

Difficulty: Medium (30–45 min)
Step 1: Turn off breaker. Step 2: Photo wiring connections. Step 3: Disconnect wires from old transformer. Step 4: Remove mounting hardware. Step 5: Install new transformer, reconnect wires matching voltage ratings. Step 6: Verify 24V output with multimeter.

My thermostat has no power. What failed?

Thermostat with no display = failed 24V transformer (or blown control board fuse). Check the 3A/5A fuse on the control board first ($1–$5 fix). If fuse is good but no 24V output from transformer, replace transformer.

Is this transformer compatible with Bryant or Payne too?

Many Tempstar parts are cross-compatible with Bryant and Payne since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across brand labels with different model numbers. To verify: check your Bryant or Payne equipment service manual for cross-compatible part numbers, or email info@nationalhvacparts.com with your model number.

Should I use OEM or aftermarket for my Tempstar transformer?

OEM recommended for reliability and warranty compatibility. OEM parts match exact factory specifications for proper fit, performance, and safety. While aftermarket alternatives cost less upfront, the risk of improper fit and reduced lifespan usually makes OEM the better value long-term.

How fast does National HVAC Parts ship?

Orders placed before 3:00 PM CST ship the same business day. Standard delivery is 2–5 business days anywhere in the continental United States. Express shipping available at checkout. We ship from Houston, TX to all 50 states. 30-day return policy on all parts.

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