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FUJITSU AST17RSA-W. Motor stays on when I turn it off.

The unit is a Fujitsu AST17RSA-W split system installed in 1997. When I turn the unit off with the remote control, the unit appears to turn off, and the heating stops, but the compressor motor keeps running. I can hear it whirring softly. When I came home yesterday the bottom vent was covered in water drops. This was after it was run on heating in the morning for a few hours. I had to turn it off at the wall to stop the motor running, and then the unit gave a big "sigh". Is there a way to reset the unit myself? Thanks.

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Make sure you are not just turning off the fan even though indoor fan is off when temperature is not met compressor will still run thinking unit is still calling .
Since it's a old system it might wire differently for newer model .If there is also a wall thermostat for this unit try shutting it off from wall thermostat and see what happens.
That sigh sound is the reversing valve so that's normal.

Posted on Jan 05, 2018

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Sounds like the contactor/relay for the compressor is stuck closed. I haven't got a circuit diagram but if you're lucky you may be able to just change the relay. If it's part of an integrated circuit board you will probably be out of luck as this is a very old model and I doubt that many parts are available.

Posted on Jan 05, 2018

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