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The contactor stopped working - Intermatic & Indoor/Outdoor Rain Tight Timer

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Posted on Jan 03, 2013

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1 Answer

Intertherm MGHA-070ABFC-05 will not run/cool


Multiple problems. Eliminate thermostat first. Remove face from wall and turn on breaker. If fan still runs you have a bad board or bad relay. If fan outside is running compressor should be too. These operate on same contactor. Verify you are getting 24 volts to coil side of contactor. If odf stops working and contactor remains pulled in you have a bad motor. If odf motor stops working the compressor will shut off due to overheating.

Jun 07, 2016 | Intertherm Heating & Cooling

Tip

What to check when you air conditioner will not stop running:


If you discover that your outdoor air conditioner and/or heat pump runs continuously even with your thermostat off and the indoor blower is off, the most probable cause is a stuck contactor. In most residential air conditioners / heat pumps, the contactor is the switch that allows voltage to your compressor and condensor fan motor; therefore, allowing them to run. The contactor allows line voltage (normally 208 - 240 volts) to pass through a set a contacts to your motor. The contacts pull in when the thermostat calls for Cooling and they "open" when the thermostat "satisfies". This is accomplished with the use of a low voltage coil. When 24 volts is applied to the coil, it creates a magnetic force that pulls the contactor in to close the contacts. When the 24 volts is removed from the coil, the magnetic force no longer exists.....a spring will force the contacts back "open" and stop the compressor and fan motor from running.
The contactor is considered a wear-n-tear item as, eventually, the contacts will wear and begin to "pit". Eventually, they will either pit so severely, they will not allow enough voltage through them to operate the motors OR they may allow enough voltage and then overheat and weld themselves together. Often times you can lightly tap on the contactor and it will "free" the contacts and stop the motors. Unfortunately, once the contactor starts "sticking" it is highly likely it will stick again. Therefore, it is recommended that the contactor be replaced at first sign of sticking or when the contacts show signs of damage/overheating via a visual inspection.

Here's a video that might be helpful to you. :-)




on Apr 27, 2010 | Heating & Cooling

1 Answer

What would cause of the Air Conditioner to stop working when there is power to the house?


Check voltage at fan motor if no voltage check cap if no voltage check power supply if you have power then change the capasitor its your cheapest and most likely problem if not change fan motor. Before you do any of that your contactor is where your voltage comes in make sure the contactor is made or on in the center of thecontactor there is a button or a plastic cover over the center push the contactor in if all comes on check your low voltagethe yellow wires on the sside of contactor if you have power there change contactor

Jul 20, 2014 | Heating & Cooling

1 Answer

A/c won't stop running and no cool air


There seems to be a problem with the wiring of the thermostat. Apparently the thermostat is calling for cool (if wired properly), but is not being satisfied. The thermostat is just a switch. When there's a call for cool, the thermostat sends 24-28 volts to the contactor (inside the condensing unit to start the compressor and outdoor fan). The indoor fan is energized through the fan relay (inside the air handler). When the temperature in the conditioned space reaches the set temperature,then the thermostat cuts the power to the contactor and it stops the compressor and outdoor fan. Check that the compressor is actually running, if not, check for 24-28 volts on the wires feeding the contactor, if there is, and the contactor isn't closing then the contactor is defective. If the contactor closes and the compressor doesn't come on, check the capacitor. If the capacitor is good then check your compressor motor. I suspect you have an improperly wired thermostat

Aug 26, 2013 | Honeywell PRO 4000 5-2 Day Programmable...

1 Answer

K star electric pool heater


Had same problem K-Star 10 both contactors, Check all your connections, I found 2 loose. If the contactor closes and can't get enough power the voltage drops, contactor starts to chatter. Loose connections also cause arcing and fires. The manual says do not store clorine in the same room.
I took the contactors out, to the bench, applied 208volts to the coil and beat on them till they stopped acting up. Put them back and they work. They are very ugly on the inside I will replace them as soon as I can find new ones on Monday..

Jul 17, 2013 | Pool & Spa

1 Answer

Repaced fan motor, capacitor, contactor still fan not working.


press the contactor in using a wooden pencil does it come on? if so then you are not getting a control signal from the tstat or a low pressure (low freon switch) is open stopping the contactor from pulling in

May 21, 2013 | Goodman CKL49AR49 Air Conditioner

1 Answer

Fan on my hvac split system won't stop running


Hello, sounds like the contactor coil is stuck which keeps sending power to the motor. Change out the contactor.

May 06, 2012 | Heating & Cooling

1 Answer

My contactor will not pull in


If the contactor won't pull in the first thing to check is the low voltage circuit to the contactor. Is there 24v going to the contactor? If yes and the contactor is not pulling in, then you have a bad or dirty contactor. I have often time seen bugs get in between the contacts and stop the flow of electricity. If there is not 24v being supplied to the contactor then you will have to check your thermostat and the wiring from the furnace to the outdoor unit. Hope this helps

Aug 14, 2011 | Goodman Heating & Cooling

1 Answer

Outside unit is continually on. Only way to stop it is to disconnect inside and outside units from the power. The unit has worked correctly until recently.


Sounds like your contactor has welded shut. Everytime your condensing unit turns on, you'll have a an arc of electricity across the contactor. Over time, the arcing causes to contactor to become covered in cardon. When it gets to a certain resistance across the coil, it will weld shut and the comressor and outdoor fan will run forever until the bad contactor gets replaced. If you know what a contactor is, it's a simple fix and the price is about $20 bucks. If your unsure about replacing it yourself, by all means can an HVAC contractor to replace it. 240 volts is not something you want to mess with unless you know what you are doing

Sep 28, 2010 | Panasonic CS-A12C Air Conditioner

1 Answer

My outside a/c unit fan stopped working. When I


By saying the condenser fan is not working as well, I have to ask is the contactor making any kind of noise?. If the contactor is not making noise, look for some smaller wires going to the contactor. These are the low voltage wires that send 24 volts to the contactor. Make sure the thermostat is turned on, set it for a temperature lower than the current room temperature. Are you getting voltage to the contactor? If the answer is no check the W wire at the air handler and at the thermostat. The G wire runs the inside blower only. This is why you can put the fan in the ON position and not have the compressor running all the time. If you are getting voltage at the contactor turn the power back on at the compressor, take a sturdy insultaded rod, very dry wood or plastic remember electricity can kill damp wood can conduct electricity. Look for a small bump in the center of the contactor. Press it with the rod and see if the compressor turns on. If it turns on when you press this point on the contactor and off when you release it then the low voltage side of the the contractor is bad. If the bump is pulled in and the unit is not running take the multimeter and carefully check to see if your are getting 240 volts across the two bottom connections and then 240 volts across the top of the connections. If you are getting 240 volts on one side only the the contactor is bad and you need a new one. Turn off ALL POWER this is the breakers for both the compressor and the furnace. Again make sure the power is off. Make a diagram of the wire positions, then disconnect them. Remove the contactor and take it to an electrical supplier or an HVAC parts supplier and get a new one. Reinstall it and reconnect the wires. Turn the power back on and everything should be working again.
Good Luck

Jun 15, 2009 | Ruud UBHC Air Conditioner

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