Question about Heating & Cooling
Fan outside comes on compressor come on start suction line start to sweat and then stop no cooling
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Posted on Jan 02, 2017
SOURCE: High Pressure cutoff
YOUR OUTDOOR FAN MOTOR SHOULD NEVER SHUT OFF IN THE AC MODE. IT IS SUPPOSED TO SHUT OFF IN THE HEAT MODE WHEN ITS IN DEFROST. IF THE UNIT IS RUNNING IN COOL AND THE OUTSIDE MOTOR QUITS ,THE COMPRESSOR WILL QUIT SOON AFTER. EITHER THE RUN CAPACITOR FOR THE FAN IS BAD OR THE FAN MOTOR ITSELF IS BAD, IF CAP IS GOOD THEN THE MOTOR IS At FAULT. THE OUTDOOR PRESSURE SWITCH CAN ALSO OPEN IF THE INDOOR FAN MOTOR FAILS IN HEAT OR THE FILTER IS PLUM NASTY in heat OR THE INDOOR COIL IS PLUGGED UP in heat.. THE PRESSURE SWITCH USUALLY TRIPS AT 400 TO 425 SO ITS WORKING CORRECTLY. YOU MAY BE CONFUSING THE ISSUE SAYING THAT THE AIR IS HOT AND COLD INSIDE. IT IS COLD WHEN AC IS RUNNING HOT WHEN HEAT PUMP IS RUNNING IN HEAT BUT ESSENTIALLY not cold or hot if compressor isn't running, but a lot of folks describe the lack of cold air as hot when the compressor isnt running. but it basically is warm or house air temp.you test the capacitor with a capacitor tester or take it to motor shop and let them test it. odds are its a 5 , 7.5 or a 10. it should test within 10 % of rated value . ask for a RESCUE brand replacement motor. they are great ,reversable etc.carefully oil and sand the motor shaft and note exactly where the blade was located in relation to the grill so you get it back just the same. usually they wire up black to a leg of 220 power. white to the other leg of 220 power. brown and brown with white stripe to the capacitor.you can also pull whole fan shroud assembly on some units and take whole thing to motor shop and let them test motor cap, replace and all you do is return to unit and connect two power leads,
Posted on Oct 26, 2008
SOURCE: i have a ruud model
If you have the condenser fan coming on and the compressor is not coming on chances are you are right. But the compressor could be done for. You will have to ohm out the compressor to make sure. Capacitors are cheap so just turn off the breaker to unit and pull the dual capacitor out and replace. Be sure you write down where the wires go as the fan runs off the same capacitor hence the name dual capacitor.
Posted on Apr 12, 2009
This may be as simple switching the thermostat to electric, under the cover is a gas/electric dip switch. Hope that helps.
Posted on Jan 17, 2010
SOURCE: Hi, i have a 11
The start/run capacitor for the fan motor must be checked.
Turn off the power to the outside unit and open the control panel.
Follow the brown wire from the fan back to the capacitor.
Look at the capacitor. If it is bukged out on top it is definitely bad.
Capacitors can be bad and not bulged on top.
It will have to be checked with a capacitor tester or replaced with a known good capacitor of the same MFD value.
If the capacitor is good and the fan does not run,the fan motor is bad and must be replaced.
Posted on Sep 20, 2010
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