5.2 Troubleshooting Chart - Model 8018 Controller
Upon power up, the 8018 Controller will test all of its
internal circuits for proper operation. If there is a problem, the
controller will sound an audible alarm, and display one of the
following error codes in the two large displays in the “PRO-
GRAM DISPLAY” section of the controller.
Problem
Cause
Remedy
ERR 1
Internal RAM test failed.
Turn unit “off”, wait one minute, turn unit back “on”, if ERR 1
reappears, call the factory. The unit must be returned to the factory
for repair.
ERR 2
External RAM test failed.
Turn unit “off”, wait one minute, turn unit back “on”, if ERR 2
reappears, call the factory. The unit must be returned to the factory
for repair.
ERR 3
EEPROM Check-sum Test failed.
Turn unit “off”, wait one minute, turn unit back “on”, if ERR 3
reappears, call the factory. The unit must be returned to the factory for
repair.
ERR 4
Real Time Clock Test failed.
Turn unit “off”, wait one minute, turn unit back “on”, if ERR 4
reappears, call the factory. The unit must be returned to the factory for
repair.
ERR 5
This test will fail if both
Turn unit OFF. Check all thermocouple connections. Turn unit ON.
thermocouples are NOT attached
to the controller, when it is turned ON.
ERR 6
Non-volatile RAM Test failed.
Wait, unit will clear itself. All user programmed memory must be
(This could appear in a low voltage,
reprogrammed. Factory-set programs will not be lost.
or “brown-out” situation.)
ERR 7
This is the result of an electrical
Turn unit “off”, wait one minute, turn unit back “on”, if ERR 7
disturbance.
reappears, call the factory. The unit must be returned to the factory for
repair.
5.3 Troubleshooting Chart - Freezing Chamber
Problem
Probable Cause
Remedy
Nitrogen continually
Controller is improperly set or is malfunctioning.
Reset/repair controller.
enters the freezing chamber
Solenoid valve is stuck in the “open” position.
Repair/replace solenoid.
Liquid nitrogen supply pressure is above 22 PSIG
Adjust LN2 supply pressure to 22 PSIG
Liquid nitrogen will not
Liquid nitrogen service supply valve is shut.
Open liquid nitrogen service supply valve.
enter freezing chamber.
Power signal, connectors are not properly,
Check for proper connections.
or completely, installed.
Solenoid valve is faulty.
Repair/replace solenoid valve.
Controller is faulty.
Repair faulty controller.
Liquid supply empty.
Low pressure supply.
Uneven cooling in freezer chamber.
Freezing rate is improperly set.
Refer to Section 4, for freezing rate information.
Fan has not been energized at the controller.
Models 1010 and 1011 ________________________________________________________________________Maintenance
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