20
Installation, Operation and Service Manual
Thermo Scientific XBF40-MD Series Blast Freezers
Troubleshooting
Evaporator fan not functioning
Confirm that the fan symbol is illuminated on the controller
and that the evaporator fan is turning.
If the fan symbol is not illuminated, check that the magnet
on the bottom hinge side of the door is properly placed in the
depression on the door.
If the fan symbol is illuminated but the fan is not turning,
check to make sure it is not blocked by frost buildup. If it
free and turns freely, contact Technical Service.
"P1" Alarm
Cabinet temperature probe
failure
Replace cabinet temperature probe
"P2" Alarm
Evaporator temperature probe
failure
Replace evaporator temperature probe
"HA" Alarm
High cabinet temperature
alarm
Allow ample time to recover from loading warm product.
Contact Service if unit does not recover.
"LA" Alarm
Low cabinet temperature alarm
Check controller parameters
"dA" Alarm
Door open alarm
Close door. If alarm persists, check door switch magnet
location. If magnet is placed correctly, contact Technical
Service.
"rtc" Alarm
Real time clock alarm
Set controller clock
"rtF" Alarm
Clock failure alarm
Contact Technical Service to replace controller.
Table 1: Troubleshooting Procedures
Problem
Cause
Solution