What are the specs for this Transformer?

The correct replacement for Tempstar model T9MPD050F12C2 — 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 T9MPD050F12C2 — 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 T9MPD050F12C2 — 115V to 24V | Ships Today

Name: Tempstar 40VA Transformer for T9MPD050F12C2 — 115V to 24V | Ships Today
Brand: Tempstar
SKU: 1172810-GEN
Price: 32.00 USD
Availability: InStock

SKU: 1172810-GEN Brand: Tempstar

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Overview

This is the genuine OEM 40VA control transformer (part number 1172810) for the Tempstar T9MPD050F12C2 furnace. The transformer steps line voltage down from 115 volts on the primary side to 24 volts on the secondary side, supplying low-voltage control power to the thermostat, control board, gas valve, and ignition circuit. Without a working transformer, none of the furnace's safety and operating controls receive power. Common failure symptoms include a completely dead furnace, a blank or unresponsive thermostat, no response when the thermostat calls for heat, and a tripped or repeatedly blown low-voltage fuse caused by an internal short. A transformer that hums loudly, runs hot to the touch, or shows scorched windings has failed and must be replaced.

Specifications

Spec	Value
Part Number	1172810
Type	Control Transformer
Brand	Tempstar
Rating	40 VA
Primary Voltage	115 V
Secondary Voltage	24 V
Fits Model	T9MPD050F12C2

Compatibility

Engineered as a direct-fit replacement for the Tempstar T9MPD050F12C2 gas furnace. Because Tempstar, Heil, Comfortmaker, and other ICP brands share a common chassis, this 40VA transformer also serves as the correct control transformer across many ICP-built furnaces of the same generation. Always verify your existing part number is 1172810 before ordering.

Installation Guide

Safety First — Disconnect power, verify zero voltage with multimeter.
Access — Remove service panel.
Document — Photo all wires before disconnecting.
Remove — Note the primary (line) and secondary (24V) lead positions, disconnect the leads, and unbolt the transformer from its mounting bracket.
Install — Mount the new transformer, reconnect the primary and secondary leads exactly per your photo, and confirm tight, clean connections.
Test — Restore power, verify 24V across the secondary terminals with a multimeter, and confirm the furnace responds to a heat call.

Signs You Need a Replacement

Furnace is completely dead with a blank thermostat
Low-voltage fuse blows immediately when power is restored
No 24V reading across the secondary terminals
Transformer hums loudly, overheats, or smells burnt

Shipping & Returns

Ships same day before 3 PM CST. 30-day returns. 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 T9...

$32.00

Frequently Asked Questions

Does this Transformer fit my Tempstar T9MPD050F12C2 — 115V to 24V | Ships Today?

Yes. This is the factory-specified OEM transformer for the Tempstar T9MPD050F12C2 — 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 T9MPD050F12C2 — 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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