Question about Intermatic K4221C Photo Cell Control 120 V 50/60 Hz. 1800 Watt "T" Swivel M

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Can the Intermatic K4221 photo control sensor be adjusted? Mine turns the lights of to late in the morning and turns it on to early in the evening! Thank you!

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Posted on Jan 02, 2017

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SOURCE: Light hooked to Intermatic K4221 photo control doesn't turn off

Photo cell is designed to fail in the on condition.....replace photo cell.

Posted on Mar 26, 2009

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SOURCE: Light hooked to Intermatic K4221 photo control doesn't turn off

Try turning the light switch (or the breaker) off and immediatly turn it back on. There is an override built into the switch to allow you to override the photocell and turn the light on during the day if needed. It sounds like the override may be on.

To turn the override on you just interrupt power for a second, and to turn it off do the same or switch the light off. Turn it back on later in the day.

Posted on Mar 23, 2010

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My son bought a new house. It has an Intermatic K4221 photo cell that never appears to work. It looks like it is connected to porch lights. They won't come on either by photocell or manual light switch. He...


Place tape over photocell lens, and flash switch off-on. Did the light come on?If you know how - remove the photocell from the circuit and see if the light works. If the light works, then the photocell is probably bad. Check power from switch to photocell with test meter.

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Yeah, I have seen tons of these units fail early. Usually someone stripped the gears.
Another approach, in terms of lighting control, is use dusk to dawn or timed motion sensors. They are always "on time" where the clock needs to be changed many times over the course of season changes, etc. They do not need to be reset after power failure or daylight savings, they just always work/
In a commercial building, interior lights should be on 24/7 OR motion sensors, and external lights Dusk to dawn.
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Hi,
The switch in the photo-eye is bad and has welded together...
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heatman101

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1 Answer

Light turns off in the morning, but does not automatically turn on in the evening


Battery-operated Intermatic timers can develop problems.

1) Battery may need to be replaced.
http://waterheatertimer.org/ST01C-program.html#EJ500

2) Troubleshoot guide on manual says to 'reset and reprogram' timer if problems occur.
http://waterheatertimer.org/Intermatic-ej500c-manual.pdf

3) Timer comes with 1 year warranty and can just go bad.
http://www.intermatic.com/products/timers/consumer%20indoor%20timers/in-wall%20timers.aspx

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1) Contact malibu lights directly.
Their site does not acknowledge TDC PTST-30012, so I cannot access a manual with best information.
Their products come with a warranty.
http://malibulights.com/customer_service/contact_us.aspx
http://malibulights.com/customer_service/owners_manuals.aspx

2) If unit can be set to override, you can buy cheap photo eye timer, and then plug power pack into cheap timer, but there is no guarantee this will work, or that power pack will burn out.
http://www.amazon.com/Intermatic-HB61RC-Digital-Outdoor-Control/dp/B00004W4X5

3) Buy ordinary power pack with dial-type timer, and then buy photo eye that fits.
http://www.intermatic.com/products/professional%20lighting/light%20expressions/accessories/ml814drp.aspx

http://store.nexternal.com/intermatic/categories.aspx?Keyword=ML814DRP&x=15&y=10

4) As electrician, I would not buy anything that costs more than $15 that comes with built-in photo eye that cannot be replaced.
Especially something as buggy as a low voltage power pack.
http://waterheatertimer.org/Malibu-power-pack-stopped-working.html

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What does the red wire attach to for a k4221 photo control?


The power wire coming into the control has a black, white and copper (ground) wire. Hook the balck wire to the control black, All the gound wires hook together, all the white wires hook together, then hook the red wire to the black of the light that you want to turn off and on.

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1 Answer

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It may be your location for the photo cell. There is a cover on the cell in most cases that slides up and down to let in light. Or you may try turning it in a little different direction to get more light.

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3 Answers

Light hooked to Intermatic K4221 photo control doesn't turn off


Photo cell is designed to fail in the on condition.....replace photo cell.

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The output setting if turned off isn't adjusting the temperature in the room automatically if its off,and by turning the output up is like turning up the heat.By turning the output switch on you can let the heater automatically control the heat.Still you need to monitor the adjustments to your liking and then you know how hot it will be when you come back into that room.

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