CMS100 Product Manual, Issue 8
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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 aecting the result.
` Ensure electrical connection from the output of the controller to the lights
` If applicable - Ensure the physical switch for the lights is switched ON.
` If applicable - Ensure the physical light switch is in working order.
` If L.E.D lighting - Ensure the power supply (transformer) is in working order.
` If uorescent lighting – Ensure the bulb is in working order.
` If uorescent lighting - Ensure the ballast is in working order.
` If uorescent 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 aecting the result.
` Ensure electrical connection from the output of the controller to the evaporator fan
` Ensure the fan motor is in working order (including fuse protection if tted)
` Ensure the fan blades are free from obstruction
` 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 aecting the result.
` Ensure electrical connection from the output of the controller to the compressor
` Ensure the compressor circuit is in working order (including fuse protection if tted)
` If thermal overload cut out protection is present - Allow the compressor time to cool o 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 nd 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:
` Dirty Evaporator or Condenser
` Loose Evaporator Fan Belts
` Improper Refrigerant Charge
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