Gecko Gecko Switch Troubleshooting guide

Gecko Switch
Quick Start Guide
1
on/off with night light
Dimmer Buon
Dip For Finger To Open Buon
Using Your Switch
2
Download our APP for FREE
Gecko Switch Installation
Gecko switch & AAA alkaline baery x 2
(come with the box)
AAAAAA
Use your smartphone to turn on/off or
adjust brightness using the dimmer,
if applicable, of your light.”
Inserting AAA batteries.
1
3
Move your finger to the semi-circle shaped dip at the boom of the press buon. Use your nail to
force open the press buon by pulling upwards and out.
Inserng two new Alkaline AAA baeries into the recess behind the main switch buon of the
Gecko Switch. The LED indicator at boom of Gecko Switch will light up with power.
Reaach the main switch buon.
AAA baeries
AAA
AAA
3Steps.
3Stick the Gecko Switch anywhere you want
Gecko Glue
Gecko Glue
2Linking to the Base Switch (optional)
If you buy the Gecko switch with a Base Switch in the same package, they are already linked by default
at the factory, so there is no need to manually link these switches. If you bought the Base Switch and
Gecko Switch separately or somehow the link was broken, they can be linked manually by holding
BOTH the main switch buon and the “+” buon for 3 seconds to enter pairing mode for both switches.
A long beep will sound when successfully linked.
3 seconds Simultaneously
GeckoBase
4
Remove peel of the Gecko Glue at the back of the Gecko Switch. Then put it anywhere you like.
To change locaon of the Gecko Switch, remove it very, very slowly. Then put it somewhere else.
The glue pad can be removed and reused over and over again. Try it!
HINT
The Gecko Glue can
be washed with water to
regain its sckiness.
Technical Assistance
[email protected]om www.geckoswitch.com
FCC
The device is approved by the FCC and it complies with Part 15 of the FCC rules. Its operaon is
subject to the following two condions:
1. This device may not cause harmful interference.
2. This device must accept any interference that may cause undesired operaon.
WARNING
Changes or modificaons to this unit not expressly approved by the party responsible of
compliance could void the user’s authority to operate the equipment.
5
LED flashes red
Symptom
Cannot turn on/off the light
Possible Cause
Baery dead
Link to Base Switch broken. Manually relink.
Baery low
Troubleshooting
Specifications
Baery: Two Alkaline AAA baeries
Bluetooth: Bluetooth 4.0
Operang ambient temperature: 32° to 95° F (0° to 35° C)
Relave humidity: 5% to 95% noncondensing
Warranty
If, within one year from date of purchase, this product should become defecve
(except baery and glue), due to faulty workmanship or materials, it will be repaired or replaced,
without charge. Proof of purchase and a Return Authorizaon are required.
If you have any quesons about the installaon or operaon of this product, please contact us at:

Gecko Switch
Quick Start Guide
1
on/off with night light
Dimmer Buon
Dip For Finger To Open Buon
Using Your Switch
2
Download our APP for FREE
Gecko Switch Installation
Gecko switch & AAA alkaline baery x 2
(come with the box)
AAAAAA
Use your smartphone to turn on/off or
adjust brightness using the dimmer,
if applicable, of your light.”
Inserting AAA batteries.
1
3
Move your finger to the semi-circle shaped dip at the boom of the press buon. Use your nail to
force open the press buon by pulling upwards and out.
Inserng two new Alkaline AAA baeries into the recess behind the main switch buon of the
Gecko Switch. The LED indicator at boom of Gecko Switch will light up with power.
Reaach the main switch buon.
AAA baeries
AAA
AAA
3Steps.
3Stick the Gecko Switch anywhere you want
Gecko Glue
Gecko Glue
2Linking to the Base Switch (optional)
If you buy the Gecko switch with a Base Switch in the same package, they are already linked by default
at the factory, so there is no need to manually link these switches. If you bought the Base Switch and
Gecko Switch separately or somehow the link was broken, they can be linked manually by holding
BOTH the main switch buon and the “+” buon for 3 seconds to enter pairing mode for both switches.
A long beep will sound when successfully linked.
3 seconds Simultaneously
GeckoBase
4
Remove peel of the Gecko Glue at the back of the Gecko Switch. Then put it anywhere you like.
To change locaon of the Gecko Switch, remove it very, very slowly. Then put it somewhere else.
The glue pad can be removed and reused over and over again. Try it!
HINT
The Gecko Glue can
be washed with water to
regain its sckiness.
Technical Assistance
[email protected]om www.geckoswitch.com
FCC
The device is approved by the FCC and it complies with Part 15 of the FCC rules. Its operaon is
subject to the following two condions:
1. This device may not cause harmful interference.
2. This device must accept any interference that may cause undesired operaon.
WARNING
Changes or modificaons to this unit not expressly approved by the party responsible of
compliance could void the user’s authority to operate the equipment.
5
LED flashes red
Symptom
Cannot turn on/off the light
Possible Cause
Baery dead
Link to Base Switch broken. Manually relink.
Baery low
Troubleshooting
Specifications
Baery: Two Alkaline AAA baeries
Bluetooth: Bluetooth 4.0
Operang ambient temperature: 32° to 95° F (0° to 35° C)
Relave humidity: 5% to 95% noncondensing
Warranty
If, within one year from date of purchase, this product should become defecve
(except baery and glue), due to faulty workmanship or materials, it will be repaired or replaced,
without charge. Proof of purchase and a Return Authorizaon are required.
If you have any quesons about the installaon or operaon of this product, please contact us at:

Gecko Switch
Quick Start Guide
1
on/off with night light
Dimmer Buon
Dip For Finger To Open Buon
Using Your Switch
2
Download our APP for FREE
Gecko Switch Installation
Gecko switch & AAA alkaline baery x 2
(come with the box)
AAAAAA
Use your smartphone to turn on/off or
adjust brightness using the dimmer,
if applicable, of your light.”
Inserting AAA batteries.
1
3
Move your finger to the semi-circle shaped dip at the boom of the press buon. Use your nail to
force open the press buon by pulling upwards and out.
Inserng two new Alkaline AAA baeries into the recess behind the main switch buon of the
Gecko Switch. The LED indicator at boom of Gecko Switch will light up with power.
Reaach the main switch buon.
AAA baeries
AAA
AAA
3Steps.
3Stick the Gecko Switch anywhere you want
Gecko Glue
Gecko Glue
2Linking to the Base Switch (optional)
If you buy the Gecko switch with a Base Switch in the same package, they are already linked by default
at the factory, so there is no need to manually link these switches. If you bought the Base Switch and
Gecko Switch separately or somehow the link was broken, they can be linked manually by holding
BOTH the main switch buon and the “+” buon for 3 seconds to enter pairing mode for both switches.
A long beep will sound when successfully linked.
3 seconds Simultaneously
GeckoBase
4
Remove peel of the Gecko Glue at the back of the Gecko Switch. Then put it anywhere you like.
To change locaon of the Gecko Switch, remove it very, very slowly. Then put it somewhere else.
The glue pad can be removed and reused over and over again. Try it!
HINT
The Gecko Glue can
be washed with water to
regain its sckiness.
Technical Assistance
[email protected]om www.geckoswitch.com
FCC
The device is approved by the FCC and it complies with Part 15 of the FCC rules. Its operaon is
subject to the following two condions:
1. This device may not cause harmful interference.
2. This device must accept any interference that may cause undesired operaon.
WARNING
Changes or modificaons to this unit not expressly approved by the party responsible of
compliance could void the user’s authority to operate the equipment.
5
LED flashes red
Symptom
Cannot turn on/off the light
Possible Cause
Baery dead
Link to Base Switch broken. Manually relink.
Baery low
Troubleshooting
Specifications
Baery: Two Alkaline AAA baeries
Bluetooth: Bluetooth 4.0
Operang ambient temperature: 32° to 95° F (0° to 35° C)
Relave humidity: 5% to 95% noncondensing
Warranty
If, within one year from date of purchase, this product should become defecve
(except baery and glue), due to faulty workmanship or materials, it will be repaired or replaced,
without charge. Proof of purchase and a Return Authorizaon are required.
If you have any quesons about the installaon or operaon of this product, please contact us at:

Gecko Switch
Quick Start Guide
1
on/off with night light
Dimmer Buon
Dip For Finger To Open Buon
Using Your Switch
2
Download our APP for FREE
Gecko Switch Installation
Gecko switch & AAA alkaline baery x 2
(come with the box)
AAAAAA
Use your smartphone to turn on/off or
adjust brightness using the dimmer,
if applicable, of your light.”
Inserting AAA batteries.
1
3
Move your finger to the semi-circle shaped dip at the boom of the press buon. Use your nail to
force open the press buon by pulling upwards and out.
Inserng two new Alkaline AAA baeries into the recess behind the main switch buon of the
Gecko Switch. The LED indicator at boom of Gecko Switch will light up with power.
Reaach the main switch buon.
AAA baeries
AAA
AAA
3Steps.
3Stick the Gecko Switch anywhere you want
Gecko Glue
Gecko Glue
2Linking to the Base Switch (optional)
If you buy the Gecko switch with a Base Switch in the same package, they are already linked by default
at the factory, so there is no need to manually link these switches. If you bought the Base Switch and
Gecko Switch separately or somehow the link was broken, they can be linked manually by holding
BOTH the main switch buon and the “+” buon for 3 seconds to enter pairing mode for both switches.
A long beep will sound when successfully linked.
3 seconds Simultaneously
GeckoBase
4
Remove peel of the Gecko Glue at the back of the Gecko Switch. Then put it anywhere you like.
To change locaon of the Gecko Switch, remove it very, very slowly. Then put it somewhere else.
The glue pad can be removed and reused over and over again. Try it!
HINT
The Gecko Glue can
be washed with water to
regain its sckiness.
Technical Assistance
[email protected]om www.geckoswitch.com
FCC
The device is approved by the FCC and it complies with Part 15 of the FCC rules. Its operaon is
subject to the following two condions:
1. This device may not cause harmful interference.
2. This device must accept any interference that may cause undesired operaon.
WARNING
Changes or modificaons to this unit not expressly approved by the party responsible of
compliance could void the user’s authority to operate the equipment.
5
LED flashes red
Symptom
Cannot turn on/off the light
Possible Cause
Baery dead
Link to Base Switch broken. Manually relink.
Baery low
Troubleshooting
Specifications
Baery: Two Alkaline AAA baeries
Bluetooth: Bluetooth 4.0
Operang ambient temperature: 32° to 95° F (0° to 35° C)
Relave humidity: 5% to 95% noncondensing
Warranty
If, within one year from date of purchase, this product should become defecve
(except baery and glue), due to faulty workmanship or materials, it will be repaired or replaced,
without charge. Proof of purchase and a Return Authorizaon are required.
If you have any quesons about the installaon or operaon of this product, please contact us at:

Gecko Switch
Quick Start Guide
1
on/off with night light
Dimmer Buon
Dip For Finger To Open Buon
Using Your Switch
2
Download our APP for FREE
Gecko Switch Installation
Gecko switch & AAA alkaline baery x 2
(come with the box)
AAAAAA
Use your smartphone to turn on/off or
adjust brightness using the dimmer,
if applicable, of your light.”
Inserting AAA batteries.
1
3
Move your finger to the semi-circle shaped dip at the boom of the press buon. Use your nail to
force open the press buon by pulling upwards and out.
Inserng two new Alkaline AAA baeries into the recess behind the main switch buon of the
Gecko Switch. The LED indicator at boom of Gecko Switch will light up with power.
Reaach the main switch buon.
AAA baeries
AAA
AAA
3Steps.
3Stick the Gecko Switch anywhere you want
Gecko Glue
Gecko Glue
2Linking to the Base Switch (optional)
If you buy the Gecko switch with a Base Switch in the same package, they are already linked by default
at the factory, so there is no need to manually link these switches. If you bought the Base Switch and
Gecko Switch separately or somehow the link was broken, they can be linked manually by holding
BOTH the main switch buon and the “+” buon for 3 seconds to enter pairing mode for both switches.
A long beep will sound when successfully linked.
3 seconds Simultaneously
GeckoBase
4
Remove peel of the Gecko Glue at the back of the Gecko Switch. Then put it anywhere you like.
To change locaon of the Gecko Switch, remove it very, very slowly. Then put it somewhere else.
The glue pad can be removed and reused over and over again. Try it!
HINT
The Gecko Glue can
be washed with water to
regain its sckiness.
Technical Assistance
[email protected]om www.geckoswitch.com
FCC
The device is approved by the FCC and it complies with Part 15 of the FCC rules. Its operaon is
subject to the following two condions:
1. This device may not cause harmful interference.
2. This device must accept any interference that may cause undesired operaon.
WARNING
Changes or modificaons to this unit not expressly approved by the party responsible of
compliance could void the user’s authority to operate the equipment.
5
LED flashes red
Symptom
Cannot turn on/off the light
Possible Cause
Baery dead
Link to Base Switch broken. Manually relink.
Baery low
Troubleshooting
Specifications
Baery: Two Alkaline AAA baeries
Bluetooth: Bluetooth 4.0
Operang ambient temperature: 32° to 95° F (0° to 35° C)
Relave humidity: 5% to 95% noncondensing
Warranty
If, within one year from date of purchase, this product should become defecve
(except baery and glue), due to faulty workmanship or materials, it will be repaired or replaced,
without charge. Proof of purchase and a Return Authorizaon are required.
If you have any quesons about the installaon or operaon of this product, please contact us at:

Gecko Switch
Quick Start Guide
1
on/off with night light
Dimmer Buon
Dip For Finger To Open Buon
Using Your Switch
2
Download our APP for FREE
Gecko Switch Installation
Gecko switch & AAA alkaline baery x 2
(come with the box)
AAAAAA
Use your smartphone to turn on/off or
adjust brightness using the dimmer,
if applicable, of your light.”
Inserting AAA batteries.
1
3
Move your finger to the semi-circle shaped dip at the boom of the press buon. Use your nail to
force open the press buon by pulling upwards and out.
Inserng two new Alkaline AAA baeries into the recess behind the main switch buon of the
Gecko Switch. The LED indicator at boom of Gecko Switch will light up with power.
Reaach the main switch buon.
AAA baeries
AAA
AAA
3Steps.
3Stick the Gecko Switch anywhere you want
Gecko Glue
Gecko Glue
2Linking to the Base Switch (optional)
If you buy the Gecko switch with a Base Switch in the same package, they are already linked by default
at the factory, so there is no need to manually link these switches. If you bought the Base Switch and
Gecko Switch separately or somehow the link was broken, they can be linked manually by holding
BOTH the main switch buon and the “+” buon for 3 seconds to enter pairing mode for both switches.
A long beep will sound when successfully linked.
3 seconds Simultaneously
GeckoBase
4
Remove peel of the Gecko Glue at the back of the Gecko Switch. Then put it anywhere you like.
To change locaon of the Gecko Switch, remove it very, very slowly. Then put it somewhere else.
The glue pad can be removed and reused over and over again. Try it!
HINT
The Gecko Glue can
be washed with water to
regain its sckiness.
Technical Assistance
[email protected]om www.geckoswitch.com
FCC
The device is approved by the FCC and it complies with Part 15 of the FCC rules. Its operaon is
subject to the following two condions:
1. This device may not cause harmful interference.
2. This device must accept any interference that may cause undesired operaon.
WARNING
Changes or modificaons to this unit not expressly approved by the party responsible of
compliance could void the user’s authority to operate the equipment.
5
LED flashes red
Symptom
Cannot turn on/off the light
Possible Cause
Baery dead
Link to Base Switch broken. Manually relink.
Baery low
Troubleshooting
Specifications
Baery: Two Alkaline AAA baeries
Bluetooth: Bluetooth 4.0
Operang ambient temperature: 32° to 95° F (0° to 35° C)
Relave humidity: 5% to 95% noncondensing
Warranty
If, within one year from date of purchase, this product should become defecve
(except baery and glue), due to faulty workmanship or materials, it will be repaired or replaced,
without charge. Proof of purchase and a Return Authorizaon are required.
If you have any quesons about the installaon or operaon of this product, please contact us at:

Base Switch
Quick Start Guide
1
Using Your Switch
Download our APP for FREE
Use your smartphone to turn on/off or
adjust brightness using the dimmer,
if applicable, of your light.”
on/off with night light
Dimmer Buon
Dip For Finger To Open Buon
2
Warning
Installing the Base Switch is an electrical shock hazard and may result in serious
injury or death. If you are unfamiliar or uncomfortable with electrical work,
please call a qualified electrician for installaon. The Base Switch is designed to
funcon as a standard light switch. It is also compable with dimmable lights and
can act as a dimmer. It is not compable with 3 way switches.
Base Switch Installation
Base switch,
wire nuts & screws
(come with the box)
Screwdriver
Voltage detector
Smartphone (oponal for taking photos)
Warranty
If, within one year from date of purchase, this product should become defecve
(except baery and glue), due to faulty workmanship or materials, it will be repaired or replaced,
without charge. Proof of purchase and a Return Authorizaon are required.
Specifications
Rated: 100-240 VAC, 50/60Hz
Max Load: 300 was
Operang ambient temperature: 32° to 95° F (0° to 35° C)
Relave humidity: 5% to 95% noncondensing
3
Remove the wall plate; use a voltage detector to make sure that the circuit is dead.
Unscrew the old switch from the electrical box and pull it out with the wires sll aached.
Take some pictures of the wires for later reference then remove the wires from the old switch.
•Turn Screws To Loosen. •Unscrew terminals •Take photos of the wires
OFF
OFF
OFF
Removing existing switch
2
ON
OFF
ON
OFF
ON
OFF
Turn off power at circuit breaker for the switch
you are replacing with the Base Switch.
5Steps.
Turning OFF power
1
4
Move your finger to the semi-circle shaped dip at the boom of the press buon. Use your nail to
force open the press buon by pulling upwards and out.
Insert the Base Switch into the wallbox. Then screw it in place.
Push the main buon back into the Base Switch
4Mounting the Base Switch to wallbox
3Wiring the Base Switch
Load
Ground
Hot(live)
5
Turn on power at circuit breaker.
Click the Base Switch to see if it works!
Now you can link it to the Gecko Switch!
HINT
Remember the Base Switch and Gecko Switch
is compable with dimmable light bulbs.
ON
OFF
ON
OFF
ON
OFF
5Turning ON power
Technical Assistance
If you have any quesons about the installaon or operaon of this product, please contact us at:
[email protected]om www.geckoswitch.com
FCC
The device is approved by the FCC and it complies with Part 15 of the FCC rules. Its operaon is
subject to the following two condions:
1. This device may not cause harmful interference.
2. This device must accept any interference that may cause undesired operaon.
WARNING Changes or modificaons to this unit not expressly approved by the party responsible of
compliance could void the user’s authority to operate the equipment.
Symptom
Cannot turn on/off the light
Light flicks or on/off
automacally
Possible Cause
Wiring error.
Burnt out light bulb.
Check circuit breaker is turned back on.
Using the dimmer funcon on a light bulb that is not dimmable.
Light bulb is less than minimal load required by the base switch.
Note that light bulb must be greater than 5 was.
Troubleshooting

Base Switch
Quick Start Guide
1
Using Your Switch
Download our APP for FREE
Use your smartphone to turn on/off or
adjust brightness using the dimmer,
if applicable, of your light.”
on/off with night light
Dimmer Buon
Dip For Finger To Open Buon
2
Warning
Installing the Base Switch is an electrical shock hazard and may result in serious
injury or death. If you are unfamiliar or uncomfortable with electrical work,
please call a qualified electrician for installaon. The Base Switch is designed to
funcon as a standard light switch. It is also compable with dimmable lights and
can act as a dimmer. It is not compable with 3 way switches.
Base Switch Installation
Base switch,
wire nuts & screws
(come with the box)
Screwdriver
Voltage detector
Smartphone (oponal for taking photos)
Warranty
If, within one year from date of purchase, this product should become defecve
(except baery and glue), due to faulty workmanship or materials, it will be repaired or replaced,
without charge. Proof of purchase and a Return Authorizaon are required.
Specifications
Rated: 100-240 VAC, 50/60Hz
Max Load: 300 was
Operang ambient temperature: 32° to 95° F (0° to 35° C)
Relave humidity: 5% to 95% noncondensing
3
Remove the wall plate; use a voltage detector to make sure that the circuit is dead.
Unscrew the old switch from the electrical box and pull it out with the wires sll aached.
Take some pictures of the wires for later reference then remove the wires from the old switch.
•Turn Screws To Loosen. •Unscrew terminals •Take photos of the wires
OFF
OFF
OFF
Removing existing switch
2
ON
OFF
ON
OFF
ON
OFF
Turn off power at circuit breaker for the switch
you are replacing with the Base Switch.
5Steps.
Turning OFF power
1
4
Move your finger to the semi-circle shaped dip at the boom of the press buon. Use your nail to
force open the press buon by pulling upwards and out.
Insert the Base Switch into the wallbox. Then screw it in place.
Push the main buon back into the Base Switch
4Mounting the Base Switch to wallbox
3Wiring the Base Switch
Load
Ground
Hot(live)
5
Turn on power at circuit breaker.
Click the Base Switch to see if it works!
Now you can link it to the Gecko Switch!
HINT
Remember the Base Switch and Gecko Switch
is compable with dimmable light bulbs.
ON
OFF
ON
OFF
ON
OFF
5Turning ON power
Technical Assistance
If you have any quesons about the installaon or operaon of this product, please contact us at:
[email protected]om www.geckoswitch.com
FCC
The device is approved by the FCC and it complies with Part 15 of the FCC rules. Its operaon is
subject to the following two condions:
1. This device may not cause harmful interference.
2. This device must accept any interference that may cause undesired operaon.
WARNING Changes or modificaons to this unit not expressly approved by the party responsible of
compliance could void the user’s authority to operate the equipment.
Symptom
Cannot turn on/off the light
Light flicks or on/off
automacally
Possible Cause
Wiring error.
Burnt out light bulb.
Check circuit breaker is turned back on.
Using the dimmer funcon on a light bulb that is not dimmable.
Light bulb is less than minimal load required by the base switch.
Note that light bulb must be greater than 5 was.
Troubleshooting

Base Switch
Quick Start Guide
1
Using Your Switch
Download our APP for FREE
Use your smartphone to turn on/off or
adjust brightness using the dimmer,
if applicable, of your light.”
on/off with night light
Dimmer Buon
Dip For Finger To Open Buon
2
Warning
Installing the Base Switch is an electrical shock hazard and may result in serious
injury or death. If you are unfamiliar or uncomfortable with electrical work,
please call a qualified electrician for installaon. The Base Switch is designed to
funcon as a standard light switch. It is also compable with dimmable lights and
can act as a dimmer. It is not compable with 3 way switches.
Base Switch Installation
Base switch,
wire nuts & screws
(come with the box)
Screwdriver
Voltage detector
Smartphone (oponal for taking photos)
Warranty
If, within one year from date of purchase, this product should become defecve
(except baery and glue), due to faulty workmanship or materials, it will be repaired or replaced,
without charge. Proof of purchase and a Return Authorizaon are required.
Specifications
Rated: 100-240 VAC, 50/60Hz
Max Load: 300 was
Operang ambient temperature: 32° to 95° F (0° to 35° C)
Relave humidity: 5% to 95% noncondensing
3
Remove the wall plate; use a voltage detector to make sure that the circuit is dead.
Unscrew the old switch from the electrical box and pull it out with the wires sll aached.
Take some pictures of the wires for later reference then remove the wires from the old switch.
•Turn Screws To Loosen. •Unscrew terminals •Take photos of the wires
OFF
OFF
OFF
Removing existing switch
2
ON
OFF
ON
OFF
ON
OFF
Turn off power at circuit breaker for the switch
you are replacing with the Base Switch.
5Steps.
Turning OFF power
1
4
Move your finger to the semi-circle shaped dip at the boom of the press buon. Use your nail to
force open the press buon by pulling upwards and out.
Insert the Base Switch into the wallbox. Then screw it in place.
Push the main buon back into the Base Switch
4Mounting the Base Switch to wallbox
3Wiring the Base Switch
Load
Ground
Hot(live)
5
Turn on power at circuit breaker.
Click the Base Switch to see if it works!
Now you can link it to the Gecko Switch!
HINT
Remember the Base Switch and Gecko Switch
is compable with dimmable light bulbs.
ON
OFF
ON
OFF
ON
OFF
5Turning ON power
Technical Assistance
If you have any quesons about the installaon or operaon of this product, please contact us at:
[email protected]om www.geckoswitch.com
FCC
The device is approved by the FCC and it complies with Part 15 of the FCC rules. Its operaon is
subject to the following two condions:
1. This device may not cause harmful interference.
2. This device must accept any interference that may cause undesired operaon.
WARNING Changes or modificaons to this unit not expressly approved by the party responsible of
compliance could void the user’s authority to operate the equipment.
Symptom
Cannot turn on/off the light
Light flicks or on/off
automacally
Possible Cause
Wiring error.
Burnt out light bulb.
Check circuit breaker is turned back on.
Using the dimmer funcon on a light bulb that is not dimmable.
Light bulb is less than minimal load required by the base switch.
Note that light bulb must be greater than 5 was.
Troubleshooting