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Lennox Air Conditioner Condensing Unit Run Capacitor #12788

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This video provides step-by-step repair instructions for replacing the run capacitor on a Lennox A/C condensing unit. The most common reasons for replacing the run capacitor are when the air conditioner isn’t cold enough or isn’t cooling at all, the condenser fan motor won't run, or the condensing unit does not run.

All of the information for this run capacitor replacement video is applicable to the following brands: Lennox

Tools used: quarter inch socket

Step By Step Instructions

1
To replace the dual run capacitor in your central air condensing unit first shut off the power to the unit.
2
You can do this by removing the fuses from the disconnect box or switching off the circuit breaker.
3
Use a quarter inch socket or nut driver to unthread the two bottom screws securing the access panel.
4
Pull the panel down to remove.
5
To ensure the run capacitor is discharged, place a screwdriver with an insulated handle across both sets of terminals – avoid touching the screwdriver blade.
6
Unthread the screw securing the capacitor retaining strap.
7
Remove the capacitor and note the location of the wires attached to it.
8
Disconnect the wires.
9
Install the new dual run capacitor by first connecting the wires to the appropriate terminals.
10
Position the capacitor in the housing then replace the screw to secure it with the retaining strap.
11
Slide the upper edge of the access panel under the top cover then thread and tighten the screws to secure.
12
With the repair completed, restore power to the condensing unit and your central air system should be ready for use.
Description
This video provides step-by-step repair instructions for replacing the run capacitor on a Lennox A/C condensing unit. The most common reasons for replacing the run capacitor are when the air conditioner isn’t cold enough or isn’t cooling at all, the condenser fan motor won't run, or the condensing unit does not run.

All of the information for this run capacitor replacement video is applicable to the following brands: Lennox

Tools used: quarter inch socket
Step-By-Step Instructions
1
To replace the dual run capacitor in your central air condensing unit first shut off the power to the unit.
2
You can do this by removing the fuses from the disconnect box or switching off the circuit breaker.
3
Use a quarter inch socket or nut driver to unthread the two bottom screws securing the access panel.
4
Pull the panel down to remove.
5
To ensure the run capacitor is discharged, place a screwdriver with an insulated handle across both sets of terminals – avoid touching the screwdriver blade.
6
Unthread the screw securing the capacitor retaining strap.
7
Remove the capacitor and note the location of the wires attached to it.
8
Disconnect the wires.
9
Install the new dual run capacitor by first connecting the wires to the appropriate terminals.
10
Position the capacitor in the housing then replace the screw to secure it with the retaining strap.
11
Slide the upper edge of the access panel under the top cover then thread and tighten the screws to secure.
12
With the repair completed, restore power to the condensing unit and your central air system should be ready for use.

Applicable Product Model

Parts Needed
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