Troubleshooting - Thermo Scientific XBF40-MD Series Installation, Operation And Service Manual

9 Troubleshooting

Table 1: Troubleshooting Procedures
Problem
Unit does not operate;
display is blank
Breaker trips on startup
Temperature fluctuates
Unit warms up
Thermo Scientific XBF40-MD Series Blast Freezers
WARNING: Troubleshooting procedures involve working with high
voltages which can cause injury or death. Troubleshooting should only be
performed by trained personnel.
This section is a guide to troubleshooting equipment problems.
Cause
Power supply
Power supply
Controller Parameters
Condenser
Door is open
Warm product recently loaded
in unit
Power supply
Compressor
Evaporator iced over
Solution
Check that the cord is securely plugged in.
Plug another appliance into the outlet to see if it is live.
If the outlet is dead, check the circuit breaker or fuses.
Contact an electrician to confirm whether the outlet is
providing suitable power for the unit.
Make sure that the control is set correctly.
Make sure the condenser is clean.
Make sure the door is completely closed.
Allow ample time to recover from loading warm product.
Check for proper voltage to the unit. If there is no voltage to
the unit, call an electrician.
If the compressor is not running, look for a green snowflake
symbol on the controller display, indicating that the system
is calling for the compressor to be on.
If the snowflake is illuminated but you do not hear the
compressor running, allow the unit 2 hours to reset its
internal protector. If the compressor does not restart after 2
hours call Technical Service.
If the snowflake is flashing, the unit is in Start Delay mode:
wait for the flashing to stop and then see if the compressor
starts. If the snowflake is not illuminated, check the
controller parameters to make sure they are set correctly.
Trigger a manual defrost cycle by holding the "melting
snowflake" key until the unit enters defrost mode.
Installation, Operation and Service Manual
Troubleshooting
19