When a garage door opener struggles to start, hums without moving, or stops working entirely, the issue is often electrical rather than mechanical. Homeowners frequently search for help with the Genie 19988A.S Garage Door Opener Motor Starting Capacitor, a small but critical component that helps the motor start smoothly. This guide explains what it does, how to identify failure, and how to replace it safely.
What Is the Genie 19988A.S Garage Door Opener Motor Starting Capacitor?
The Genie 19988A.S Garage Door Opener Motor Starting Capacitor is an electrical component designed to store and release energy to help the opener’s motor overcome initial inertia.
In simple terms, it gives the motor a power boost at startup. Without it, the motor may not have enough torque to begin turning, even though electricity is present.
Starting capacitors are commonly used in:
- Garage door openers
- Air compressors
- Washing machines
- HVAC blower motors
For Genie openers, this capacitor is engineered to match specific motor requirements.
Why Does a Garage Door Opener Need a Starting Capacitor?
Electric motors require more energy to start than to run. The starting capacitor temporarily increases voltage to the motor windings during startup.
Key Functions
- Provides initial torque
- Reduces motor strain
- Ensures smooth and fast startup
- Prevents overheating
According to general electrical theory explained on
👉 https://en.wikipedia.org/wiki/Capacitor
capacitors store electrical energy and release it when needed—making them ideal for motor startup assistance.
Which Genie Models Use the 19988A.S Starting Capacitor?
The 19988A.S capacitor is typically used in older Genie garage door opener models, especially chain-drive units with AC motors.
Common compatibility factors include:
- AC-powered Genie openers
- Units manufactured before widespread DC motor adoption
- Motors requiring external start assistance
Always confirm compatibility using:
- Your opener’s manual
- The part number printed on the old capacitor
- Manufacturer support documentation
How Do You Know If the Genie 19988A.S Capacitor Is Bad?
A failing starting capacitor shows clear warning signs.
Common Symptoms
- Motor hums but door does not move
- Door starts slowly or stalls
- Opener works intermittently
- Breaker trips during startup
- Motor overheats
In many real-world service cases, technicians report that over 40% of “dead motor” diagnoses are actually failed capacitors, not motor failures.
Visual Signs of a Failed Starting Capacitor
When inspecting the Genie 19988A.S capacitor, look for:
- Bulging or swollen casing
- Oil leakage
- Burn marks
- Corrosion at terminals
⚠️ If you see any of these signs, replacement is strongly recommended.
Is It Safe to Replace a Genie Garage Door Opener Capacitor Yourself?
Yes—for most homeowners with basic tools—if safety precautions are followed.
However, capacitors can hold residual electrical charge, even when unplugged.
Safety Precautions
- Unplug the opener
- Wait at least 10–15 minutes
- Discharge the capacitor using an insulated screwdriver
- Wear insulated gloves
If you are uncomfortable with electrical components, professional service is the safer option.
Step-by-Step: How to Replace the Genie 19988A.S Starting Capacitor
Step 1: Disconnect Power
Unplug the opener from the outlet. Never rely on wall switches alone.
Step 2: Open the Motor Housing
Use a Phillips screwdriver to remove the cover.
Step 3: Locate the Capacitor
The capacitor is usually:
- Cylindrical or oval
- Mounted near the motor
- Connected by two spade terminals
Step 4: Discharge the Capacitor
Using an insulated screwdriver, touch both terminals simultaneously for 2–3 seconds.
Step 5: Remove Old Capacitor
- Take a photo for wiring reference
- Pull off the connectors gently
Step 6: Install New Capacitor
- Match microfarad (µF) rating exactly
- Match voltage rating or higher
- Secure in original mounting position
Step 7: Reassemble and Test
Restore power and test the opener with the door closed.
Correct Specifications for Genie 19988A.S Capacitor
Using incorrect specs can damage your opener.
| Specification | Requirement |
|---|---|
| Capacitance | Must match original µF |
| Voltage | Equal or higher rating |
| Type | Motor starting capacitor |
| Terminals | Spade connectors |
Never substitute a run capacitor for a start capacitor.
Genie 19988A.S vs Other Starting Capacitors
Comparison Table
| Feature | Genie 19988A.S | Generic Capacitor |
|---|---|---|
| OEM Fit | Yes | Not always |
| Reliability | High | Variable |
| Lifespan | 7–15 years | 3–7 years |
| Price | Moderate | Lower |
OEM-style replacements tend to offer better long-term reliability.
What Causes a Starting Capacitor to Fail?
Several factors shorten capacitor life:
- Power surges
- Heat buildup
- Frequent cycling
- Aging dielectric material
- High humidity
In US climates with hot summers, capacitors may degrade faster due to sustained heat exposure.
Can a Bad Capacitor Damage the Motor?
Yes—indirectly.
A weak or failed capacitor forces the motor to:
- Draw excessive current
- Overheat during startup
- Experience increased mechanical stress
Over time, this can lead to permanent motor damage, which is far more expensive than replacing a capacitor.
Cost Breakdown: Capacitor vs Motor Replacement
| Repair Type | Average Cost |
|---|---|
| Starting capacitor | $15–$40 |
| Professional labor | $80–$150 |
| Motor replacement | $250–$500+ |
| New opener | $400–$700 |
Replacing the capacitor early can save hundreds of dollars.
When Should You Call a Professional?
Seek professional help if:
- Capacitor replacement doesn’t fix the issue
- Wiring insulation is damaged
- Motor emits burning smell
- Opener trips breaker repeatedly
These symptoms may indicate deeper electrical faults.
FAQ: Genie 19988A.S Garage Door Opener Motor Starting Capacitor
What does the Genie 19988A.S starting capacitor do?
It provides the extra electrical energy needed for the motor to start turning under load.
Can I use a different capacitor instead of the 19988A.S?
Only if the µF rating and voltage match exactly. Incorrect specs can damage the opener.
How long does a Genie starting capacitor last?
Typically 7–15 years, depending on usage, heat, and power quality.
Will a garage door opener run with a bad capacitor?
Sometimes it may hum or start intermittently, but it will eventually fail completely.
Is replacing a capacitor cheaper than replacing the opener?
Yes. A capacitor replacement is one of the most cost-effective garage door repairs.
Conclusion
The Genie 19988A.S Garage Door Opener Motor Starting Capacitor plays a vital role in reliable garage door operation. When it fails, the opener may appear broken—even though the motor is still good.
By understanding the symptoms, specifications, and replacement process, homeowners can fix the problem quickly and avoid costly repairs. If this guide helped you, share it on social media or with anyone troubleshooting a Genie garage door opener—it could save them time and money.
