What are the specs for this Transformer?

The correct replacement for Tempstar model TCH042AKD1 — 40VA Control Circuit | 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 TCH042AKD1 — 40VA Control Circuit | 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 24V Transformer for TCH042AKD1 — 40VA Control Circuit | Ships Today

Name: Tempstar 24V Transformer for TCH042AKD1 — 40VA Control Circuit | Ships Today
Brand: Tempstar
SKU: 34329055-GEN
Price: 26.00 USD
Availability: InStock

SKU: 34329055-GEN Brand: Tempstar

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Overview

This OEM 24-volt control transformer (Tempstar part 34329055) supplies low-voltage 24V power to the control circuit of your Tempstar TCH042AKD1 heat pump system, including the reversing valve solenoid, contactor coil, and thermostat circuit. Rated at approximately 40VA, it steps line voltage down to the 24VAC required by modern HVAC controls. When a control transformer fails, the entire system loses low-voltage power — the unit will not energize, the thermostat goes blank, and neither heating nor cooling will start. A buzzing transformer, a blown low-voltage fuse, or a melted secondary winding are all signs of failure.

Specifications

Spec	Value
Part Number	34329055
Type	Control Transformer
Brand	Tempstar (ICP)
Secondary Voltage	24 VAC
Rating	~40 VA
Fitment	OEM Replacement

Compatibility

Engineered as a direct-fit OEM replacement for the Tempstar TCH042AKD1 heat pump. ICP-family units (Tempstar, Heil, Comfortmaker, Carrier, Bryant) frequently share this control component — verify your existing part number 34329055 before ordering.

Installation Guide

Safety First — Disconnect power at the breaker and verify zero voltage with a multimeter before touching any wiring.
Access — Remove the control-panel service cover to reach the transformer.
Document — Photograph all primary and secondary wire connections before disconnecting.
Remove — Disconnect the line-voltage primary and 24V secondary leads, then unbolt the failed transformer from its bracket.
Install — Mount the new transformer, reconnect primary and secondary leads exactly per your photo.
Test — Restore power and confirm 24VAC at the secondary terminals and that the system energizes.

Signs You Need a Replacement

System completely dead with no low-voltage power
Blank or unresponsive thermostat
Repeatedly blown low-voltage fuse
Audible buzzing or burning smell from the transformer

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 24V Transformer for TCH...

$26.00

Frequently Asked Questions

Does this Transformer fit my Tempstar TCH042AKD1 — 40VA Control Circuit | Ships Today?

Yes. This is the factory-specified OEM transformer for the Tempstar TCH042AKD1 — 40VA Control Circuit | 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 TCH042AKD1 — 40VA Control Circuit | 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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