Question about Hitachi RAS-09UH Air Conditioner

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Outdoor fan motor is not running fast enough?

Out door unit was making terrible noise for couple of days, then outdoor fan stopped running. I thought fan motor froze. I got a new fan motor. After installing the new fan motor and a capacitor, turn the unit on, fan was not running fast enough. After few min, fan stopped. Fan motor was really hot. I think internal overload kicked the motor off. Compressor still runs. I had a new connector; I replaced that also, and did not make a difference. Please let me know if you have any experience with this. thanks.......

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Thanks for the suggestion. I figured out the problem. The replacement fan motor I bought was general fan motor. it had 5 wires. Two of them went to the capacitor (this unit has combo capacitor, 3 leg). I followed the schematic diag on the motor and connected one leg to the C and the other leg to the FAN on capacitor. what was happening, the start winding was working against the run winding in the motor. Once I switch the wires in the capacitor, fan ran at full speed. thanks again for your reply.

Posted on Oct 15, 2008

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Check to make sure that you have the correct voltage going to the motor. It sounds like you lost one of your legs of power which would give you 110v instead of 220v. Or it could be in the pc board.

Posted on Oct 15, 2008

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Compressor runs after 5minutes stop.kollin 1hp split wall inverter


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Malfunction of Outdoor Unit Fan Motor ( E7)
Remote Controller
Display
E7 Method of
Malfunction
Detection
Abnormality of fan motor system is detected according to the fan speed detected by hall IC when the
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?? When the fan runs with speed less than a specified one for 15 seconds or more when the fan motor
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?? When connector detecting fan speed is disconnected
?? When malfunction is generated 4 times, the system shuts down.
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?? Fan does not run due to foreign matters tangled
?? Clearing condition: Operate for 5 minutes (normal)
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Be sure to turn off power switch before connect or disconnect connector, or parts damage may be
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Replace the outdoor unit fan motor.
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Inside motor not running and will not run on just fan. cage turns easily by hand


If the out door unit is running without the indoor fan running, you could possibly have a motor burned out or your indoor unit.
If nothing is running, check to make sure all panels are on inside, and that you have electricity to the indoor unit. Some air handlers and furnaces are equipped with a safety switch on the access door to the motor assembly. Also , there may be a switch that looks like a light switch beside the indoor unit.

Once again, check and see if the outdoor unit is running. It will eventually freeze up without the indoor fan. Hope this helps. Please email me if you have any more questions , I will try to step you through. Mark

Jul 11, 2011 | Ruud Heating & Cooling

1 Answer

Outdoor fan will stop running and compressor overheats and shuts off. it wont come back on til u reset it at the thermostat. the outdoor unit has a new compressor and fan motor.


I realize the outdoor unit has a new compressor and fan motor - therefore - both those components should be ok - however - the fan motor 'should not' be going off - and the fact that it is going off is what is causing your compressor to overheat and shut off.
The reason the fan motor is going off is - it is bad (breaking down electrically) and is going off on the internal overload. If this is the case (a) the motor needs to be replaced or (b) it's possible that the fan capacitor needs replacing; but fan capacitors generally do not cause much problem, and when they do go bad they usually develop an obvious (to the eyes) bulge. If the capacitor has a bulge in it - I would surely change it out -and probably would (as a shot in the dark) anyway - since they are relatively cheap ($10-$15).
In your complaint you say that "the outdoor fan will stop running and compressor overheats and shuts off." If it happens 'exactly' that way then I'm betting your problem will be that the fan motor is defective as mentioned above, with an outside chance of the capacitor being defective, in which case if it isn't the capacitor - you will need a new fan motor. Note: outside fan motors are notorious for being fickle and it would not surprise me in the least to find a fairly new outside motor that is defective. I would check and see if you had any warranty on it.
All that being said - it is also possible that your outside unit has a 'high pressure cut-out switch,' although most units don't have them anymore, these days. However, if you have such a switch - it is possible (very likely) that it is shutting off the AC. Note: a high pressure cut-out switch will 'shut the entire outside unit off,' not just the fan motor. If that is what is happening then there's a good chance you have such a switch.
If it is happening that way, (the entire outside unit stops) then I would try 'washing the outside coil' really, really good and see if it will run ok afterwards.
Note: outside coils are sometimes difficult to get clean - sometimes requiring you to disassemble to some degree in order to make sure you get them clean.
Always, Always turn all power (including inside thermostat) OFF when washing the outside coil.

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