Question about Mastercool 67680 Evaporative Cooler Air Conditioner

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Pulleys not working

When I turn on the power switch for the air conditioner, the motor hums like it is trying to start but it won start turning the belt, until I help the bottom wheel move slightly ... then it runs like a champ.
Is my belt to tight? do I need to adjust something?

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More than likely the pulley set screw is lose. Look on the inner hub of the pulley's both on the motor and the fan for a threaded hole with an allen head type of screw in it. Before you 'help' it to turn, look to see if one shaft of the other is spinning inside the pulley without the pulley itself turning. Buy a set of allen wrenches and tighten the screw. You may have to remove the belt to see the setscrew hole. It can be done by stretching it over the edge of the larger pulley and rotating it by hand. Put it back the same way. BTW make sure the power is OFF! fingers are still at a premium.

Posted on May 07, 2009

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Motor winding seems to be shortcircuited

Posted on May 05, 2008

  • Kleanthis Mavropoulos
    Kleanthis Mavropoulos May 05, 2008





    The unit tries to start for a few seconds and then quits

    Every air conditioner has a motor called a compressor. The compressor provides the cooling capacity for the air conditioner. If the compressor or its electrical controls are defective the compressor may try to start, fail, and create an electrical overload. If the unit does create an overload, every compressor circuit is also equipped with an overload safety switch. The safety switch is designed to protect the compressor from burning out. The safety switch will cut the power to the compressor for a certain length of time and then reset itself. When it resets it will allow the electricity to flow to the compressor once again. If the compressor then starts, the unit should function normally. If the compressor doesn't start when the overload resets, the overload will again cut the electricity to the compressor. This cycle will continue indefinitely. (Always allow three to five minutes before restarting the compressor.) If this situation is occurring, unplug the air conditioner and get help from a qualified repair technician. This problem is often fatal to the air conditioner because the cost of repair often exceeds the price of a new air conditioner.

  • Kleanthis Mavropoulos
    Kleanthis Mavropoulos May 05, 2008

    give model no and mfg name to search if a service manual is available on web.

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see this causes and fix it. God bless you
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Thermal Cut Out Fuse Kit Most dryers have several temperature control devices such as a thermal fuse, thermal cut out, high limit fuse or high limit thermostat. Some manufacturers sell the thermal fuse and thermal cut out in a kit. These kits normally solve no-heat problems rather than when the dryer won't start. However, in some models, this kit will solve both problems. Even though this is not the most common part to fail if the dryer won't start, both can be checked using an ohm meter or continuity checker. If they have continuity they are good. If not, they should be replaced.

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9_29_2012_12_57_07_pm.gif

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see this causes and fix it.God bless you
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Door Switch The door switch is located near the dryer door and is activated when the door is closed. If the door switch fails, the dryer won't start at all. Many types of door switch will make an audible click when they are activated. If the door switch makes a clicking sound when activated it is probably not defective. If it doesn't make a click, it can be checked with an ohm meter or continuity checker. The door switch is relatively easy to replace and is usually not very expensive.

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Thermal Cut Out Fuse Kit Most dryers have several temperature control devices such as a thermal fuse, thermal cut out, high limit fuse or high limit thermostat. Some manufacturers sell the thermal fuse and thermal cut out in a kit. These kits normally solve no-heat problems rather than when the dryer won't start. However, in some models, this kit will solve both problems. Even though this is not the most common part to fail if the dryer won't start, both can be checked using an ohm meter or continuity checker. If they have continuity they are good. If not, they should be replaced.
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see this causes and fix it. God bless you
Timer The timer is normally not at fault when the dryer won't start. In many situations where timers are replaced they end up being returned. First, check all of the more common components in this troubleshooting guide before replacing the timer. If the dryer won't start, the cause is much more likely to be a thermal fuse or switch. The timer can not be tested, it must be replaced if it is defective.

Main Control Board The main control board is normally not at fault when the dryer won't start. First, check all of the other components in this troubleshooting guide before replacing the main control board. The main control board can not be tested and must be replaced if it is defective. If there are obvious signs of burning or a shorted out component on the board, it should be replaced.

Belt Switch If the dryer won't start, there might be a belt switch that has failed. This is not a common problem and most dryers do not have this switch. If the dryer has a belt switch, the switch shuts off power to the entire dryer if the belt breaks. It is possible that this switch has failed, even if the belt is not broken. It can be checked with an ohm meter or continuity checker. If the dryer works at all, even if all it does is hum, this is not the problem.

Incoming Power Problem If the dryer won't start, check to certain there is electricity to the dryer. For a gas dryer, unplug the dryer from the wall and plug something else into the outlet to see if it's working. For an electric dryer, check the home circuit breaker or fuses. If they are working, check the outlet where the dryer plugs in with a volt meter. There should be between 208 and 240 volts. If there is power to the dryer, check the more common items in this troubleshooting guide.

Thermal Cut Out Fuse Kit Most dryers have several temperature control devices such as a thermal fuse, thermal cut out, high limit fuse or high limit thermostat. Some manufacturers sell the thermal fuse and thermal cut out in a kit. These kits normally solve no-heat problems rather than when the dryer won't start. However, in some models, this kit will solve both problems. Even though this is not the most common part to fail if the dryer won't start, both can be checked using an ohm meter or continuity checker. If they have continuity they are good. If not, they should be replaced.

Drive Belt On most dryers, if the drive belt breaks the motor can still be heard and it will still be blowing air out the exhaust tube, but the drum will not spin. However, in some dryers when the drive belt breaks the tension pulley arm trips a switch which shuts off power to the entire dryer. If the dryer won't start, check to see if the belt is broken. If it is, replace the belt and the dryer should be fine. If the belt is not broken, check the other components that can fail when the dryer won't start.

Drive Motor The dryer drive motor turns the drum and the blower wheel to exhaust the air. If the dryer won't start the motor might be defective. Before replacing the motor, check the thermal fuse, start switch and door switch because all three are more likely the cause. If the dryer won't start and the dryer motor makes a humming noise there might be something caught in the blower wheel, or the drum might be binding. Try removing the belt from the motor and checking the blower wheel for obstructions. The dryer motor can't be tested easily. If the more common components have been checked and it seems the motor itself is defective, it will need to be replaced. It is not serviceable.

Door Switch The door switch is located near the dryer door and is activated when the door is closed. If the door switch fails, the dryer won't start at all. Many types of door switch will make an audible click when they are activated. If the door switch makes a clicking sound when activated it is probably not defective. If it doesn't make a click, it can be checked with an ohm meter or continuity checker. The door switch is relatively easy to replace and is usually not very expensive.

Start Switch The start switch is on the dryer control panel. Depending on the model, either press a button or turn a dial to start the dryer. If the start switch fails the dryer won't start or make any noise. Test the switch with an ohm meter or continuity checker. If the dryer hums when the start switch is activated, or if the motor runs only while activating the start switch, the motor might be defective or something might be binding the drum preventing it from turning freely. If the dryer start switch does not have continuity when it is activated, it will need to be replaced.

Thermal Fuse The thermal fuse helps to prevent a dryer fire by shutting off power to the dryer if it overheats. If the dryer won't start check this fuse first. Test the thermal fuse with an ohm meter or continuity checker. This is the most common part to fail when the dryer won't start. Once the thermal fuse has blown, it has to be replaced. It can not be reset.
9_29_2012_1_07_19_pm.gif

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2 Answers

Hello... I have a Goodman CKL49 a/c unit on the exterior of my house. I have checked everything I can think of and isolated the issue to the fan motor not turning on. The unit will recieve the signal from...


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