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Intertherm outside unit - s3ba-036k - does not run

Unit was working and quit.unit has power and control voltage.neither fan or compressor run.contactor pulls in when thermostat calls for a/c.contactor has 125vac on both sides.

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Measure the voltage across the line. The outside unit normally runs on 220 Volts. Measuring each side of the line to ground will give 110 Volts. If your outside disconnect is of a fused type one fuse could be blown. If a fuse is blown on one side of the line you will read zero volts differential across the line.

Check the type of fuse used in the disconnect. Make sure the proper size time delay fuse is installed on both sides of the line at the disconnect.

Posted on May 17, 2008

  • Paul Pineapple Sep 30, 2013

    at this timethere is no low voltage getting to the contacter

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1 Answer

Why am I not getting cold air


See if compressor is running. I would replace the contactor since it controls fan and compressor.

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If there are 3 wires on the top of the cap they may have it wired wrong. If the are markings on top such as "H" "F" "C" H should go to the compressor, C should go to power on top of contactor, F goes to Fan. If it isn't stamped on top look for a paint mark near a terminal...this will indicate Common.

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It sounds like that unit is connected to a "power saving load controller" device from the power company. The power company can turn your unit on & off with a radio signal. If you manually activated contactor and unit ran. I would bet that the power company's device or the wiring connecting it is where the problem lies. Call the power company and have them check their device. If they tell you that the device has been tested remotely and is working fine. Explain to them that you can activate your unit manually and it works fine. They should not charge you to come out. Those "load controller devices" have a pretty good longevity record.

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Sounds like you are on the right track. The symptom of the contactor not pulling is your clue to the solution. When you turn the thermostat down lower than the room temperature and the thermostat calls for cooling, the outside unit should start immediately. There are a few exceptions to this but generally this is correct. So if you turn the system to cool and the thermostat is calling for cool then the contactor should pull in immediately. If it does not then check for 24 volts to the contactor. If you have 24 volts to the contactor then the contactor is the problem. If you do not have 24 volt power to the contactor coil then you will have to find where the break in voltage to the contactor is happening.
There are many reasons why you may not be getting 24 volts to the contactor, so check what i stated above before you go any further. Repost if this is the solution or you need further assistance.
Important tip....the yellow wire from the thermostat carries the 24 volt power from the thermostat to the contactor.

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1 Answer

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First thing I would look at is to make sure you have power at the disconnect 110 coming
in on each leg to unit. Second, I would look at the capacitor for obvious bulging or leaking
Third I would check to see if the contactor has burnt points or bugs in it. Your disconnect
may have fuses in it which may have failed as well .

(All checks of the unit with power off to all breakers as there will be more than one
double breaker supplying power to the unit).

The hum you hear indicates that the contactor is pulled in on the outside unit but still may
be burnt or have ants or earwigs especially in between the contacts

. The capacitor can hold a charge even after equipment is off so discharge it to the chassis
before removal. Replace only with same Microfarad rating and equal voltage or higher
Remember to mark the wires as to which came off the HERM / C/ FAN terminals or take a
cell phone picture.

I have just replaced my intertherm condensing unit after it had it's 3rd compressor failure.
It was more cost effective than buying a compressor and hoping all the other components
were going to last.

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1 Answer

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if the fan outside is turning on and inside fan is blowing too, then you have a compressor problem. could be a capacitor gone bad (or needing a hard start kit) to the entire compressor failure

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1 Answer

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