CHART MVE 1839 - 10 Troubleshooting Quick Reference

MVE Biological Systems
TEC 3000 Operating and Maintenance Freezer Manual
13289499 Rev H • 141
10. Troubleshooting Quick Reference
Symptom
Possible Causes
Fixes
Instructions
Freezer not filling
Improperly connected LN2 supply
Verify LN2 connections
Equipment Usage
Page 7
Inadequate LN2 supply volume or
pressure
Verify adequate supply
Verify Adequate LN2 Supply
Page 115
Fill solenoid valves not opening
Verify fill solenoid
resistance
Solenoid Valve Replacement
Page 119
Check fill solenoid valves
for debris
Lid switch not engaged
Verify lid switch settings
and functionality
Lid Switch Settings
Page 58
Current LN2 level at or above the
high level setpoint
Verify current LN2 level
and level control settings
Liquid Level Settings
Page 52
Auto Fill disabled
Press Start Fill to verify
manual operation.
Confirm auto fill settings
Auto Fill Control
Page 53
Slow fills or
Long fill times
Inadequate LN2 supply
Verify adequate supply
Verify Adequate LN2 Supply
Page 115
Clogged inline filter
Clean/replace inline filter
Inline Filter Replacement
Page 118
Fill solenoid valves not opening
all the way
Verify fill solenoid
resistance
Solenoid Valve Replacement
Page 119
Check fill solenoid valves
for debris
Leak in plumbing or LN2 supply
connection
Check for leaks
Plumbing Leak Check
Page 116
Incorrect
temperature
readings
Restore to defaults, improperly
calibrated or requires
recalibration
Recalibrate temperature
sensor
Temperature Sensor
Calibration
Page 80
Incorrect LN2 saturation
temperature for altitude
Verify and adjust LN2
saturation temperature
LN2 Saturation Temperature
Page 51
Faulty temperature probe
Confirm resistance values
and replace if necessary
Resistance Table
Page 131
Incorrect LN2 level
readings
Requires calibration
Perform LN2 level
calibration
LN2 Level Calibration
Page 84
Disconnected clear vinyl tube
Check clear vinyl tube
connections and integrity
Plumbing Leak Check
Page 116
Leak in level sensing line
Perform leak test on purge
valve, vinyl tube, and
fittings
Purge valve defective
Check resistance of purge
valve (140 ohms)
Purge valve replacement
Insufficient freezer venting
Increase lid gasket vent.
Replace gasket/lid if
necessary
Lid Gasket Replacement
Page 121
Obstruction in level sensing line
Purge level sensing
annular line and clear any
debris in the bottom of
freezer. Complete freezer
thaw and moisture removal
may be necessary
Complete Freezer Thaw and
Moisture Removal
Page 124
Consistent power
failure alarms
Non-uniform AC voltage (dirty
power)
Install uninterruptable power supply (UPS), Battery Backup, or
quality surge protector
Transition to generator power