What MFD capacitor do I need for my Tempstar AC?

The correct replacement for Tempstar model T8MPT050B12B1 — 5 MFD 440V Oval | 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 T8MPT050B12B1 — 5 MFD 440V Oval | 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 Run Capacitor for T8MPT050B12B1 — 5 MFD 440V Oval | Ships Today

Name: Tempstar Run Capacitor for T8MPT050B12B1 — 5 MFD 440V Oval | Ships Today
Brand: Tempstar
SKU: 1170643-GEN
Price: 16.95 USD
Availability: InStock

SKU: 1170643-GEN Brand: Tempstar

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Overview

This OEM oval run capacitor (part number 1170643) provides the starting and running torque for the motor in your Tempstar T8MPT050B12B1 gas furnace. Rated at 5 MFD and 440 volts, it stores and delivers the electrical charge that keeps the motor spinning efficiently. When a run capacitor weakens or fails, the motor draws excess current, overheats, and eventually stops — leading to no airflow, a humming motor that won't start, or a unit that trips its breaker. This capacitor ships with the original oval form factor and mounting strap ("STRAP CAPACITOR OVAL S") for a direct OEM fit.

Specifications

Spec	Value
Part Number	1170643
Type	Single Run Capacitor, Oval
Brand	Tempstar / ICP / Heil
Capacitance	5 MFD
Voltage	440V
Tolerance	±6%
Fit	OEM Replacement

Compatibility

Engineered for the Tempstar T8MPT050B12B1 furnace and other ICP-family equipment (Tempstar, Heil, Comfortmaker) using OEM part 1170643. Always confirm your existing capacitor's MFD and voltage rating before ordering.

Installation Guide

Safety First — Disconnect power at the furnace switch and breaker, then verify zero voltage with a multimeter.
Access — Remove the furnace service/blower panel.
Document — Photograph all capacitor wiring before disconnecting.
Remove — Discharge the old capacitor across its terminals with an insulated resistor, loosen the mounting strap, and pull the leads.
Install — Secure the new capacitor in the strap and reconnect each lead per your photo.
Test — Restore power and confirm the blower starts and runs smoothly.

Signs You Need a Replacement

Blower motor hums but won't start
Bulging, leaking, or burst capacitor top
Intermittent airflow or motor cutting out under load
Measured capacitance falls outside the 5 MFD ±6% rating

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 Run Capacitor for T8MPT...

$16.95

Frequently Asked Questions

Does this Capacitor fit my Tempstar T8MPT050B12B1 — 5 MFD 440V Oval | Ships Today?

Yes. This is the factory-specified OEM capacitor for the Tempstar T8MPT050B12B1 — 5 MFD 440V Oval | 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 T8MPT050B12B1 — 5 MFD 440V Oval | 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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