CMS100
Product Manual, Issue 8
www.nexo.com
Page 41
5.8
Other Problems
5.8.1 Cooler lights do not switch ON/OFF as expected
Note: Enter the service mode via the APP or the In-code test routine via the front panel of controller to
ensure that the controllers intended operation is not affecting the result.
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Ensure electrical connection from the output of the controller to the lights
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If applicable - Ensure the physical switch for the lights is switched ON.
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If applicable - Ensure the physical light switch is in working order.
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If L.E.D lighting - Ensure the power supply (transformer) is in working order.
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If fluorescent lighting – Ensure the bulb is in working order.
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If fluorescent lighting - Ensure the ballast is in working order.
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If fluorescent lighting - Ensure the starter is in working order.
5.8.2 Evaporator fan does not switch ON/OFF as expected
Note: Enter the service mode via the APP or the In-code test routine via the front panel of controller (if
applicable) to ensure that the controllers intended operation is not affecting the result.
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Ensure electrical connection from the output of the controller to the evaporator fan
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Ensure the fan motor is in working order (including fuse protection if fitted)
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Ensure the fan blades are free from obstruction
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Ensure the evaporator fan belt is not loose and/or worn out
5.8.3 The compressor does not switch ON/OFF as expected
Note: Enter the service mode via the APP or the In-code test routine via the front panel of controller (if
applicable) to ensure that the controllers intended operation is not affecting the result.
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Ensure electrical connection from the output of the controller to the compressor
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Ensure the compressor circuit is in working order (including fuse protection if fitted)
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If thermal overload cut out protection is present - Allow the compressor time to cool off and
reset the thermal overload protection (if applicable)
5.8.4 If the compressor has failed
The vast majority of all compressor failures are due to a problem with the system, that causes the
compressor to fail. If you don’t find this problem with the system and correct it, a replacement compressor
would also soon fail.
Some of the most common contributors to compressor failure are:
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Dirty Evaporator or Condenser
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Loose Evaporator Fan Belts
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Improper Refrigerant Charge
