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Blowing fuse in controller

My roof top a/c unit blows the controller fuse every time the fan comes on. compressor working fine. disconnected blower motor wires and fuse still blows. brand name is domestic.

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Controller bad

Posted on Jun 18, 2009

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Posted on Jan 02, 2017

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id bet it is not the fuse. see why? the blower, would be dead.
fuse 45: all is only S/R that is the label too.

this box is long and skinny
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and
2 fuse top
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INSTRUMENT CLUSTER AND BLOWER MOTOR QUIT TOGETHER.


Belief it or not your problem may be at one off your electric fans, also a possibility your a/c compressor coil shorted, so disconnect your a/c condenser fan and your a/c compressor check them for short and replace has needed, here is the logic every time you turn your heater on defrost it will cycle your a/c and it will blow your fuse, there is a circuit breaker on fuse box by left kick panel way up make sure it is in good condition push on it and you will feel it click if trigger, is not spring back it may be at fault to, replace it. good luck

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Why wont my a/c or heater fan come on?


When the blower works only on the high setting its usually a bad blower resistor which is right near the blower motor. now you say it would always blow high regardless of the fan speed setting that would indicate probably the climate control unit or a connector problem somewhere. finally it not working at all may be the climate control unit or connection went bad even further. it might have a blown fuse or a bad blower motor in addition to the climate control unit or connector problem .check for power and ground at the blower motor. the power is supplied from fuses and may have a relay also. the ground is supplied from the climate control unit and goes through the resistor to control the fan speed. good luck

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RV Dometic Duo Therm roof top AC w/heat pump Model #630515.321El Serial #21631212 Yr. 2003. It is the rear unit, front unit working fine. In AC mode it is blowing hot air as if the heat pump is on. Fan...


If the Air comeing out is the same as the temp inside the RV make sure the compressor is running and not just the fans. It could be low on freon. If freon is ok then you would need to ck the wiring to the selector switch for a short. It would be obviouse because there will be melted wires. I am leaning toword low on freon since you have already been inside the wiring/control unit.

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could be AC compressor clutch shorting out.try disconnecting AC compressor electrical connector and see if fuse still blows.

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Air conditioning blower stays on at all times.


Per your description, I believe you may have a blower fan relay that is stuck closed.
Remove the relay from the under-hood fuse center and see if the fan stops.
If it does stop, put the relay in slowly and see if you here the relay "click" and the fan come back on.
Let me know.
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1 Answer

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Either a bad blower motor or blower motor resistor. If the air is coming from the defroster only, check for a disconnected or broken vacuum line under the hood by the passenger firewall.

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