Motion Sensor Light won't come on but works fine on "Test"
I have a Desa Motion Sensor light that has worked fine for 5 years now. We thought a light had burned out so we replaced it but now it won't come. We put it to the "Test positon and both lights work fine. Then we set it to "Dawn to Dusk" and "Max" position for "5" minutes. Exactly where it was before the bulb burnt out.
However, we have tried everything and it simply doesn't come on anymore.
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You will need to replace the thermocouple or flame sensor, which ever this has. You can also try to use really fine sand paper and rub the soot off the sensor and try that. Some times that does in fact work. If not you will have to replace it. A thermocouple can be purchased at lowes and a flame sensor can be purchased online at ebay.com <- The cheapest place for flame sensors, just make sure you get the proper one. Hope this helps you.
Remove the cover on the left side if you are standing behind it looking toward the front. Find the fuse on the circuit board and check it. It will be inside a little retangular plastic cover. If the fuse isn't blown remove the top half of the tube and try turning the fan by hand to make sure it is free. If is stuck you will probably need a new motor. If these 2 things are OK, check the flame sensor. It is a photo type sensor and you should be able to see it while you are check the fan motor. Test it with an ohmmeter. Connect the meter to leads from the sensor. Cover the openning of the sensor and it should read somewhere around 4500 ohms. Uncover the openning and shine a light in and the reading should drop to 200 - 300 ohms. Let me know what you find if this doesn't get you running.
I recently had a similar problem with my DESA wall-mounted vent-free natural gas heater. We had it repaired but the problem recurred annually until it wouldn't stay on, even on low. There is a part known as an oxygen depletion sensor (sometimes called a flame sensor) that is part of the pilot assembly. When it is working properly, it sends a very tiny current that lets the heater know to keep feeding gas. After a few years the sensor can get rusty, which interferes with its electrical job, causing it to tell the heater to shut off so it doesn't kill you. A temporary repair can be effected by removing the part and cleaning it with sandpaper or emery paper. I suppose compressed air might work too but probably not for long if it is impeded by rust and not just dust. I found all this out from the repairman who thought he had it fixed and then it went out as he was leaving. He couldn't find the part but I found it online at a DESA-authorized distributor and it was about $40. He installed it in about 10 minutes and it has now worked like new (it's at least 15 years old) for over a month.