CMS200
Product Manual, Issue 6
www.nexo.com
Page 43
5.9
Other Problems
5.9.1 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.
5.9.2 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.
`
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
5.9.3 Heater 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 heater circuit
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Ensure the heater circuit is in working order (including fuse protection if fitted)
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Test the heater element for continuity – Remove the heater element from the circuit and
measure across the two terminals. A reading of zero (short circuit) or infinity (open circuit) is a
fail.
5.9.4 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)
