Fuse is located on the bottom back side by on/off switch. Grip both top and bottom to pull out. It's a squeeze lever on both ends. I was able to pull out using fingernails once, the second time I needed to use a paper clip on one end.
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There may be a thermal fuse in the vicinity of the motor, it may be held to the motor, there will also be one wrapped in the windings just for the motor, or it may just be covered with a section of black shrink wrap. It will have a current rating and a temperature rating as well. Otherwise look closely on the control circuit board as a "pico fuse" really small fuse can be there. It's only indicator will be a current rating like "2A"
Assuming that the unit was working fine before you cleaned it. Did you remove the back lower panel while cleaning it? It the panel that holds the electrical socket and fuse. If you did, check to see if the electrical connector is seated to the main board. Also check if the keyboard connector (the one that looks like a telephone jack) is plugged into the main board. Also, check if you model has a switch on the back that it is set to the on position. And press the power switch on the front keypad to see if that make the unit work. That all I can think that might have gone wrong.
At the rear of the unit is the filter. When the filter is removed, the small screw or whatever it is called, that is attached to the filter on the lower right side, disengages the the safety switch just below the filter on the unit itself, if there is nothing to hold down this safety switch the unit will not operate. So take off the filter, there is a small notch on the unit, inside this notch is the safety switch, Try pressing down on this switch and see what happens. I hope this helps. Also, it may be the fuse.
i am a low voltage tech my wife told me that our 506840 air cleaner stopped working so being a tech geek i had to know why it just stopped working.when plugged in i heard a click telling me that the main board was getting power.opened the back end where power cord goes to put my meter and voltage was going to the main power coil. but the main board was oxidized. when my wife was cleaning the filters and might not have had the filters completely dried the water was dripping down to main board.the unit to main power source is not design very well where water from cleaning the filters can drip down to main power board.solution i am working on is trying to get a new board when we bought this it was $499.00
I was able to find the power-on switch to be defective. The switch is a momentary normally off switch constructed of two contacts on a printed circuit board. After five years, the surface of the switch contacts became oxidized and no longer made electrical continuity when depressed. I rewired the two wires to a new momentary switch and both my Ionic Air Cleaners are working again.
i do apologize for the inconvenience the only thing that i can suggest is the that whole unit will need to be reset. so the machine can connect again with the remote. also make sure that batteries are fully charged. If that doesn't work please let me know.