What MFD capacitor do I need for my Tempstar AC?

The correct replacement for Tempstar model T8MPN075F16A1 — 10 MFD 370/440V | 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 T8MPN075F16A1 — 10 MFD 370/440V | Ships Today.

My AC hums but will not start. What part do I need?

An AC that hums but will not start is the classic symptom of a failed capacitor. The capacitor provides the electrical boost needed to start the compressor and fan motors. When it fails, you hear the hum of the motor trying to start but it cannot overcome inertia. Other symptoms include the fan spinning slowly, the AC cycling on and off rapidly, or a visibly swollen or leaking capacitor. Replacement cost: $15 to $80 for the part, DIY in 30 minutes.

Is this capacitor 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 Oval Run Capacitor for T8MPN075F16A1 — 10 MFD 370/440V | Ships Today

Name: Tempstar Oval Run Capacitor for T8MPN075F16A1 — 10 MFD 370/440V | Ships Today
Brand: Tempstar
SKU: 1170643-GEN
Price: 18.95 USD
Availability: InStock

SKU: 1170643-GEN Brand: Tempstar

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Overview

This OEM oval run capacitor (part #1170643) is the strap-mount motor-run capacitor used in the Tempstar T8MPN075F16A1 gas furnace. Rated at 10 MFD and 370/440V, it supplies the continuous phase-shift current that keeps the blower motor running smoothly. As a run capacitor degrades, the motor pulls excess amperage, overheats, and struggles to start — causing short cycling, a motor that hums without spinning, or repeated overload trips. Installing a fresh capacitor restores motor torque and helps protect the costlier blower motor from premature failure.

Specifications

Spec	Value
Part Number	1170643
Type	Single Oval Run Capacitor (Strap Mount)
Brand	Tempstar / ICP / Heil
Capacitance	10 MFD
Voltage	370/440V
Tolerance	±6%

Compatibility

Direct OEM fit for the Tempstar T8MPN075F16A1 furnace and other ICP-family (Heil, Comfortmaker, Tempstar) units that specify part 1170643. Confirm the MFD and voltage rating on your existing capacitor before ordering.

Installation Guide

Safety First — Disconnect power at the furnace switch and breaker, then verify zero voltage with a multimeter. Discharge the capacitor across its terminals with an insulated resistor.
Access — Remove the blower compartment service panel.
Document — Photograph all wire connections before disconnecting.
Remove — Loosen the mounting strap, note terminal markings, and pull the spade connectors off the old capacitor.
Install — Secure the new capacitor with the strap and reconnect each wire to its matching terminal per your photo.
Test — Restore power and confirm the blower starts promptly and runs without humming.

Signs You Need a Replacement

Blower motor hums but won't start or spins slowly
Furnace short cycles or trips on motor overload
Bulged, leaking, or swollen capacitor top
Measured capacitance reads below the rated 10 MFD

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 Oval Run Capacitor for ...

$18.95

Frequently Asked Questions

Does this Capacitor fit my Tempstar T8MPN075F16A1 — 10 MFD 370/440V | Ships Today?

Yes. This is the factory-specified OEM capacitor for the Tempstar T8MPN075F16A1 — 10 MFD 370/440V | 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 capacitor on my Tempstar T8MPN075F16A1 — 10 MFD 370/440V | Ships Today?

Difficulty: Easy (20–30 min)
Step 1: Turn off power at breaker. Step 2: Open condensing unit panel. Step 3: Photograph the old capacitor wiring (Common/Herm/Fan). Step 4: Discharge old capacitor with insulated screwdriver. Step 5: Disconnect and remove old capacitor. Step 6: Mount new capacitor, reconnect wires to matching terminals. Step 7: Close panel, restore power, test. Tools: screwdriver, needle-nose pliers.

My AC hums but won’t start. What part do I need?

An AC that hums but won’t start is the classic symptom of a failed capacitor. The capacitor provides the electrical boost to start the compressor. When it fails, you hear humming but the motor can’t overcome inertia. Other symptoms: fan spinning slowly, AC cycling on/off rapidly, or a visibly swollen capacitor. Fix: replace capacitor ($15–$80 DIY, 30 min).

Is this capacitor 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 capacitor?

OEM strongly recommended. OEM capacitors have ±6% MFD tolerance vs aftermarket ±10%. The looser tolerance causes motor winding stress, higher temps, and shorter compressor life. Price difference is only $10–$20 — OEM is the clear value choice.

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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