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Brivis evaporative working OK, used as fan only to bring cool air into house. Switched off and went to turn on again 2 weeks later, no response. Screen of controller blank, will not turn on? Where do I start to look?

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  • 75 Answers

Hi, if the unit has a remote control,check the batteries and replace if required. Unplug unit from wall socket and check the filter in the unit where the cold air comes out, the cover lifts upwards. Clean filter by using a vacuum cleaner and reinsert. Plug and switch on power at source. Hope this helps.

Posted on Oct 22, 2013

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Posted on Jan 02, 2017

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SOURCE: fan coil unit won't cool or heat in room1 while room2 runs well

could be undercharged, or overcharged, or wires weren't put back on valves in unit.

Posted on Feb 16, 2009

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SOURCE: Fan works but condenser does not kick on

You air handler and condensor run off of two seperate circuit breakers. They share the same control voltage source. With the air handler responding to the thermostat setting, we know you have control voltage. You either have a problem with the line voltage at your condensor or something is happening in the control. Check your circuit breakers and/or fuses to your outdoor unit. Also, look for a red button near the area where the refrigeration pipes enter your condensing unit. Push the red button. If it starts to run, your unit went out on High Head Pressure. A dirty air filter this time of year can cause head pressure problems in the heat cycle (assuming this is a heat pump). Also check for cleanliness of the condensor coil and ensure proper operation of the outdoor fan motor.
There are a couple of components inside the condensor that could prevent it from running. One is the contactor. If the contacts are pitted or if a bug crawled in between them, it will prevent the unit from running. Another component is the Dual Run Capacitor. If this fails, it could prevent operation of your outdoor fan and compressor. Don't forget to check all your wires and connections. Always shut off all power prior to reaching into the electrical compartment.
I hope you find this to be very helpful moving forward. :-)
Testing Run Capacitors

Failed Compressor Contactor

Posted on Apr 03, 2010

  • 2006 Answers

SOURCE: The central air turns on, but does not cool. The

There should be an electrical box next to your exterior unit. Open it up and there should be a pull handle on an electrical bridge. Usually when it is turned one way it will make an electrical connection and if it is rotated 180 degrees and plugged in it won't make an electrical connection.

Posted on Jun 04, 2011

Testimonial: "Thanks so much! I found the box and turned the pull handle and now our central air is working!Thanks again!"

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The first thing you want to do is open the freezer and see if the fan inside there is running. The reason is the freezer cools the refrigerator side by circulating air from the freezer. If the fan is running then your problem is one or more parts of the defrost system is malfunctioned and in return your problem arises. There are three parts to the system, the defrost timer or in some cases control board, defrost thermostat also known as a bi-metal, and the defrost heater. The defrost system is set up to operate as so. The defrost timer or control board will turn the machine off, in some cases every 8 hours, some 12. During this time period the defrost heaters, located behind the freezer wall and rest underneath the evaporator, yet wires to them run up the side of it, are energized and emit heat that raises upward to melt the ice that has formed on the evaporator coils. The bi-metal or defrost thermostat is at the top of the evaporator. When the heat from the heater starts to reach the bi-metal, it breaks the circuit turning the heater off. The whole purpose of this is because the freezer cool the refridgerator side by drawing air across the coils and blowing to the other side via the evap fan motor. In my opinion, if you change one part of the defrost system change them all because usually when one part fails another will follow, so save yourself the time and the food loss, the cost difference is minute

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1 Answer

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Remove the front cover and make sure the temp sensing wire is in place on the front of the evaporator coils. If it has fallen and is touching the evaporator plumbing the unit can preform as you described.

Also check for signs of icing / ice build up on the evaporator coils after the uint has run for a couple of hours. Ice build up will also cause this symptom. IF you do find that the unit is icing up that can be caused by:
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As you can see above there are several things that can cause the symptom your described. It cetainly sounds as if you either have an icing problem or a control board problem.

The next time the symptom occurs... place the unit of fan only for at least 30 minutes and then see if you can switch it to cool, and actually have it cool. If it does cool properly after switching to fan only for 30 minutes you most likely have an icing problem.

Thanks for using FixYa.

Kelly

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