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Thread: Fujitsu Problem
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12-02-2007, 02:40 AM #1
Fujitsu Problem
I installed a Fujitsu a 12RQ unit a few months ago for my den. The room is about 325 sq ft. The unit will run until desired temp is reached and cycle off. The unit will then cycle on and off continually about every 4 or 5 minutes. Is the unit oversized or is there a problem with the unit?
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12-02-2007, 11:18 AM #2
Re: Fujitsu Problem
when you say it cycles every 4-5 minutes do you mean that it comes on after 5 mins, runs for a minute or so, goes off and then comes on again after another 5 mins. if that it the case it sounds normal. if on the other hand it constantly comes on and goes off within the space of a minute then that could indicate a problem
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12-02-2007, 10:23 PM #3
Re: Fujitsu Problem
Dehum mode???
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12-02-2007, 11:38 PM #4
Re: Fujitsu Problem
You give very very limited info but.......perhaps the problem may be more due to undersize not oversize.
You say it's in your Den.
A 325sq ft den, containing PC, maybe a lazer printer good lighting and a large south facing window, aga in the kitchen downstairs??????
Freezing up anyone??
More info needed me thinks..
regards
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22-02-2007, 10:30 AM #5
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22-02-2007, 11:01 AM #6
Re: Fujitsu Problem
My be the unit is short circling. Air flow bouncing of something to close, air flow reentering the unit giving false temp, unit thinking it's got the room to its desired temp?
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22-02-2007, 03:53 PM #7
Re: Fujitsu Problem
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03-03-2007, 06:09 PM #8
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03-03-2007, 06:29 PM #9
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04-03-2007, 12:12 AM #10
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04-03-2007, 12:02 PM #11
Re: Fujitsu Problem
Hi Guys
if it was a fridge I would say it is either over sized or the control (return air) sensor is picking up on air short cycling straight back to the return air grill form the discharge grill. Is the indoor unit free to circulate the air around the room.
Kind Regards AndyIf you can't fix it leave it that no one else will:rolleyes:
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04-03-2007, 03:10 PM #12
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04-03-2007, 03:34 PM #13
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04-03-2007, 04:36 PM #14
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05-03-2007, 01:27 AM #15
Re: Fujitsu Problem
whether the refrigeratory has the refrigerating duty or it's a empty room? If it's vacancy, there's not a problem.
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05-03-2007, 01:36 AM #16
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08-03-2007, 03:15 AM #17
Re: Fujitsu Problem
My speaking is if there's normal refrigeration duty when the compressor unit is working? Just as above mentioned points, if your compressor is over sized? If it is, the pull down time is too short results in the frequent ON-OFF action. But, if your fridge is empty when you run the refrigerated unit, the reason is the insufficient refrigeration duty, not the compressor.
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22-03-2007, 10:06 PM #18
Re: Fujitsu Problem
Sounds to me like the compressor is running fine to start with but then is overheating and the short cycling is being caused by the compressors internal overload - as the compressor cools the overload resets and the compressor runs again until the overload trips again. If this is the case then there is a major problem. Check these:
1. Condensor fan operation
2. Refrigerant charge - abnormal charge will cause abnormally high compressor temps
3. Available air flow to condensor.
Hope this helps
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22-03-2007, 10:57 PM #19
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24-03-2007, 07:22 AM #20
Re: Fujitsu Problem
Sounds to me like the unit has reached set point and is cycling on & off normally. Is the fan on automatic this will cause the fan to start & stop.
:cool: Do the job once & do it right. :cool:
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24-03-2007, 10:20 AM #21
Re: Fujitsu Problem
What is the temperature of the air entering the front grille near the sensor?
Is the sensor in the correct location (not touching a cold coil).
Is the remote operating correctly? Such as changing fan speed, louvres etc.
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04-04-2007, 04:53 PM #22
Re: Fujitsu Problem
i had this problem before with fujitsu .take out the return air probe and place it as far away from the unit as you can at ceiling height rejoin the cables by crimping .just use bell wire .and away it should go
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07-04-2007, 02:37 AM #23
Re: Fujitsu Problem
This sounds like it might be a good solution. How did you conceal the sensor and wire? I have no attic to run wire thru. Any suggestions?