What are the specs for this Transformer?

The correct replacement for Tempstar model T4H330GKD100 — Class II | 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 T4H330GKD100 — Class II | 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 24V Transformer for T4H330GKD100 — Class II | Ships Today

Name: Tempstar 40VA 24V Transformer for T4H330GKD100 — Class II | Ships Today
Brand: Tempstar
SKU: 1172574-GEN
Price: 32.00 USD
Availability: InStock

SKU: 1172574-GEN Brand: Tempstar

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Overview

This OEM Tempstar control transformer steps the unit's line voltage down to the 24V Class II control circuit that powers the contactor coil, defrost board, and reversing-valve solenoid on the T4H330GKD100 heat pump. Rated at 40VA, it supplies the low-voltage signal that lets the thermostat and control board switch high-voltage loads. When a transformer fails — usually from a shorted control wire or a stuck contactor coil drawing excess current — the entire low-voltage system goes dead: no thermostat display, no contactor pull-in, and no call for cooling or heating. A blown transformer is one of the most common causes of a completely unresponsive outdoor unit.

Specifications

Spec	Value
Type	Control Transformer (step-down)
Brand	Tempstar (ICP / Heil)
Rating	40 VA
Secondary Voltage	24V
Class	Class II low-voltage
Application	Heat pump control circuit

Compatibility

Fits the Tempstar T4H330GKD100 heat pump and related ICP-family (Heil, Comfortmaker) systems using a 40VA 24V control transformer. Confirm the VA rating and the part number stamped on your existing transformer before ordering, as VA requirements vary by control package.

Installation Guide

Safety First — Disconnect power at the outdoor disconnect and verify zero voltage with a multimeter.
Access — Remove the control-panel access cover.
Document — Photograph the primary and secondary leads before disconnecting.
Remove — Disconnect the line-voltage primary and the 24V secondary leads, then unbolt the transformer from the panel.
Install — Mount the new transformer and reconnect primary and secondary per your photo, matching tap voltage.
Test — Restore power and confirm 24V across the secondary terminals with a meter.

Signs You Need a Replacement

Thermostat is completely blank or unresponsive
No 24V at the contactor coil; outdoor unit won't engage
Repeated low-voltage fuse blows on the control board
Burnt smell or scorch marks at the transformer body

Shipping & Returns

Ships same day on orders placed before 3 PM CST. 30-day returns on unused parts. 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 24V Transformer fo...

$32.00

Frequently Asked Questions

Does this Transformer fit my Tempstar T4H330GKD100 — Class II | Ships Today?

Yes. This is the factory-specified OEM transformer for the Tempstar T4H330GKD100 — Class II | 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 T4H330GKD100 — Class II | 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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