Specifications

Part No. 20862 Rev. G February 2015 - 14 - Visair+ Chilled Cabinets
TROUBLE SHOOTING continued
Boil-off /Pump
Failure LED
illuminated
If the cabinet shuts down and the Boil-off/Pump fail LED fault light is lit, then
either the condensate pump has failed or the boil-off element thermal cut-out
will have tripped.
Thermal Cut-
out Tripped
Check if the probe in the boil-off tank is dirty and needs cleaning (a dirty probe
can complete a circuit to earth causing the unit to think water is still present and
keep the element powered up) clean if required.
Check if the probe in the boil-off tank is bent or incorrectly positioned and
touching the side of the tank - (this will complete a circuit to earth causing the
unit to think water is still present and keep the element powered up) repair as
required.
Check if the control unit is faulty and continues to give an out-put to the element
relay when no water is present. Disconnect the probe wire from terminal "S+" on
the control unit. If it continues to output 230V on terminal "L1" after 10 seconds,
replace the control unit.
Water present,
but no heating
If the boil-off element does not come on even though water is present and
touching the bottom of the sensor probe, check the following:
 Check for 230V across the element, if there is 230V across the element and
the element does not heat replace the element.
 If the thermal cut-out has 230V supply, try resetting the thermal cut-out. If
the thermal cut-out won't reset replace it.
 If 230V is not present at the thermal cut-out, check if the element relay has
230V supply to its contacts. If no power is present at the switched terminals,
check the cabinet power supply. If 230V power is present on the switched
terminals, check if the relay coil has 230V power across the coil terminals. If
there is 230V across the element relay coil terminals, replace the relay.
 If 230V power is not present across the element relay coil terminals, check
for a 230V out-put from the control unit terminal "L1". If 230V power is not
present, check for a 230V power supply into the control unit on terminal "L".
 If 230V power is present on the control unit terminal "L", check the unit by
shorting out the sensor terminals "S+" & "S-". If after shorting sensor
terminals "S+" & "S-" the unit does not provides a 230V output on terminal
"L1", replace the control unit. If the control unit does provide a 230V output
on terminal L1 then the sensor wiring and sensor need to be checked.
 Check the sensor wiring for continuity and repair or replace if open circuit.
Check the probe in the boil-off tank for dirt build-up over its surface (this can
act as an insulator), clean as required.