Telemark Cryogenics Microprocessor Based Cryochillers
Page
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Revision 1.0.7 October 2018
The CoreSense™ module will continue to display the code
until the fault condition has been rectified and or manual
power reset (unit Powered off) has been carried out. More
than one LED can be illuminated depending upon the fault.
The CoreSense™ LED’s will flash at about one every second
with a three second pause in between the each flashing
cycle. (i.e. x number of flashes followed by a pause).
Status LED Status LED Description Status LED Troubleshooting
Information
Green Alert
LED
Solid
Module supply voltage
present.
Compressor running OK
1. Supply voltage present.
2. Compressor Running OK
Green Alert
LED
3 Flashes
Short Cycling.
Compressor power on/off
too many times
1. Check pressure or temperature
control.
2. Possible loss of refrigerant.
Green Alert
LED
5 Flashes
Open Circuit
Demand signal is present
but no compressor
current for four (4) hours
1. Compressor Thermal Overload
trip.
2. Compressor Contactor Failed.
3. Open Circuit in compressor
supply wiring.
4. Compressor Windings
Damaged.
Green Alert
LED
8 Flashes
Welded Contactor.
No demand signal, but
current has been
detected in one or all of
the 3 phases. This is
displayed for 24 hours
after last detection
1. Contactor welded closed.
2. Thermostat demand signal not
connected to module. Verify the
wiring form the thermostat to
module.
Green Alert
LED
11 Flashes
Discharge Temperature
Sensor Error. Short or
open circuit detected.
1. Check discharge Temperature
sensor wiring and mounting.
2. Check for open or short circuit.
(Resistance 86 k
@ 77°F
(25°C).
Green Alert
LED
12 Flashes
Current Transducer (CT)
error
3. Check CT module plugged into
module.
4. Check for short circuit on CT
module.
Yellow Alert
LED
Solid
Trip
Demand Present but no
current detected.
1. Compressor Thermal Overload
tripped.
2. High Pressure Trip switch
Tripped. Reset.
3. Contactor failure.
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