What are the specs for this Transformer?

The correct replacement for Tempstar model T8MPL075B12B2 | 115V 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 T8MPL075B12B2 | 115V 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 T8MPL075B12B2 | 115V to 24V | Ships Today

Name: Tempstar 40VA Transformer for T8MPL075B12B2 | 115V to 24V | Ships Today
Brand: Tempstar
SKU: 1172810-GEN
Price: 28.95 USD
Availability: InStock

SKU: 1172810-GEN Brand: Tempstar

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Overview

This genuine OEM 40VA control transformer (part number 1172810) steps 115V line voltage down to the 24V control voltage that runs the thermostat, gas valve, igniter circuit, and control board on the Tempstar T8MPL075B12B2 furnace. The transformer is the heart of the low-voltage control system - when it fails, the furnace goes completely dead: no thermostat response, no call for heat, and no 24V at the control board. Failures are typically caused by a shorted control wire, a stuck gas valve drawing excess current, or simple age and heat fatigue. This factory-correct 40VA unit provides ample capacity for the furnace's control load.

Specifications

Spec	Value
Part Number	1172810
Type	Step-Down Control Transformer
Brand	Tempstar (ICP)
Rating	40 VA
Primary Voltage	115V
Secondary Voltage	24V
Fitment	OEM exact replacement

Compatibility

Fits the Tempstar T8MPL075B12B2 gas furnace and related ICP-built furnaces under the Tempstar, Heil, and Comfortmaker brands that use the 115V-to-24V 40VA control transformer. Verify your existing transformer is rated 40VA with a 115V primary before ordering.

Installation Guide

Safety First - Disconnect power at the furnace switch and breaker, then verify zero voltage with a multimeter before working.
Access - Remove the control/blower service panel to reach the transformer.
Document - Photograph all primary and secondary wire connections before disconnecting them.
Remove - Disconnect the leads, remove the mounting screws, and lift out the failed transformer.
Install - Mount the new transformer, reconnect the 115V primary and 24V secondary leads exactly per your photo.
Test - Restore power, confirm 24V at the secondary, and verify the furnace responds to a thermostat call for heat.

Signs You Need a Replacement

Furnace completely unresponsive with no thermostat display or call
No 24V measured at the control board or secondary terminals
Burnt smell or visibly scorched transformer windings
Repeated blown low-voltage fuse traced to a failed transformer

Shipping & Returns

Ships same day on orders placed 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 T8...

$28.95

Frequently Asked Questions

Does this Transformer fit my Tempstar T8MPL075B12B2 | 115V to 24V | Ships Today?

Yes. This is the factory-specified OEM transformer for the Tempstar T8MPL075B12B2 | 115V 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 T8MPL075B12B2 | 115V 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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