Module 2 sur 10 200m 200 min 11 exam Qs 11 exam questions covered
Opener Electrical Diagnostics
Power supply verification, motor testing, capacitor checks, transformer output, logic board diagnostics, and LED flash code interpretation.
- Verify power supply and voltage at the opener
- Test motor windings and start capacitors
- Interpret logic board LED flash codes
- Diagnose transformer and relay failures
Leçon 1
Power Supply & Voltage Verification
Starting at the Source
Always begin electrical diagnostics at the power source and work toward the component. Many apparent opener failures are actually power supply problems.
Check Outlet
Verify 120V at the receptacle with a voltmeter
→
Check GFCI
Reset any tripped GFCI breaker or outlet
→
Check Cord
Inspect power cord for damage, test continuity
→
Check Internal
Verify voltage at the logic board power input
Common Power Problems
| Symptom | Likely Cause | Test |
|---|---|---|
| Completely dead | No power to outlet | Voltmeter at outlet |
| Dead after storm | Tripped GFCI or breaker | Reset GFCI, check panel |
| Intermittent power | Loose connection | Wiggle cord, check voltage |
| Works on battery only | AC power lost | Check outlet and cord |
Safety First
Always use a non-contact voltage tester before touching any wiring. Even when you believe the power is off, verify with a tester. Electrical shock from 120V can be fatal.
Key Takeaway
Start electrical diagnostics at the power source - verify 120V at the outlet before investigating the opener. Tripped GFCI breakers are the most common cause of a completely dead opener. Always verify power is off before touching wiring.