5. Troubleshooting
Troubleshooting Chart
User Manual
Problem
Possible Cause
Corrective Action
Compressor stops running
and does not restart.
Excessive discharge pressure
Reset the discharge pressure relay by
inserting a finger through the PS1 access
hole located on the back panel and
pushing the green reset switch forward.
Contact a Polycold Service Center if the
problem persists.
Inadequate cooling of the
cold probe
Excessive heat load on the
Cold Probe
Verify the probe is in proper ambient
pressure (1 torr or deeper vacuum). See if
there is excessive external frosting of the
trap housing. Defrost the probe and retest
the results. Contact a Polycold Service
Center if the problem persists.
5-31
Brooks Automation
