Thermo Scientific XBF40-MD Series Installation, Operation And Service Manual page 24

Troubleshooting
Table 1: Troubleshooting Procedures
Problem
"P1" Alarm
"P2" Alarm
"HA" Alarm
"LA" Alarm
"dA" Alarm
"rtc" Alarm
"rtF" Alarm
20 Installation, Operation and Service Manual
Cause
Evaporator fan not functioning
Cabinet temperature probe
failure
Evaporator temperature probe
failure
High cabinet temperature
alarm
Low cabinet temperature alarm
Door open alarm
Real time clock alarm
Clock failure alarm
Solution
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.
Replace cabinet temperature probe
Replace evaporator temperature probe
Allow ample time to recover from loading warm product.
Contact Service if unit does not recover.
Check controller parameters
Close door. If alarm persists, check door switch magnet
location. If magnet is placed correctly, contact Technical
Service.
Set controller clock
Contact Technical Service to replace controller.
Thermo Scientific XBF40-MD Series Blast Freezers