Elstat Nexo CMS200 - Condenser Sensor Alarms; Evaporator Sensor Alarms; Freeze-up protection (888); Condenser high temperature (Ht) alarms

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 aecting 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.
5.9.2 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 aecting 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
5.9.3 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 aecting the result.
` Ensure electrical connection from the output of the controller to the heater circuit
` Ensure the heater circuit is in working order (including fuse protection if tted)
` 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 innity (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 aecting 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)