Thermo Scientific Jewett Pass-Thru BBR25D-1B, Installation And Operations

Troubleshooting

Thermo Scientific

Jewett Pass-Thru Blood Bank Refrigerators

         29

Chapter 9  

Troubleshooting

PROBLEM

POSSIBLE CAUSE

SOLUTION

The unit will not operate

Unit is not turned on

Flip the switch in the back of the unit to the "On" position and 
confirm light on switch comes on. 

Power cord unplugged

Plug unit into a grounded 3 prong outlet on a dedicated 

circuit

Power supply/Outlet is not 

working

Plug another electrical device into the outlet to confirm the 
outlet is receiving power. If the device does not work check 
and replace the building fuse or reset the circuit breaker. If 
problem continues call an electrician.

Building circuit breaker tripped

Reset breaker and plug unit into a grounded 3 prong outlet on 
a dedicated circuit

Power supply voltage incorrect

Verify power supply voltage matches unit voltage on 

dataplate

Unit warms up or 

temperature fluctuates 

(if unit is warming up 
remove product before 
troubleshooting to 

protect)

Door is open

Make sure door is completely closed and sealing properly

Warm product loaded into unit

Allow ample time to recover from loading warm product

Power supply/Outlet is not 

working

Plug another electrical device into the outlet to confirm the 
outlet is receiving power. If the device does not work check 
and replace the building fuse or reset the circuit breaker. If 
problem continues call an electrician.

Condenser is blocked or dirty

Clean condenser to ensure sufficient airflow

Airflow to machine 

compartment blocked

Maintain proper clearances around unit as described in 

“Installation” 

Airflow inside unit is blocked

Ensure aiflow path to grill inside freezer/refrigerator is clear 
and there is room for airflow around contents

Evaporator coil iced over

Look through grill inside unit to see if ice is blocking airflow 
through evaporator. If there is excessive ice turn unit off to 
defrost unit. Turn unit back on after ice is clear.

Cold or warm air from building 
HVAC system blowing directly on 
refrigeration system

Move unit out of HVAC airflow path

Troubleshooting table continued on next page