Thermo Electron NESLAB System III, Installation-Operation- Installation-Operationbasic Service

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Section VI Troubleshooting
Error Codes
The controller also has the capability to display error codes.
Power up Errors
Power up errors are displays until any controller key is pressed. If the error
message persists the problem is likely a keypad or controller board failure.
Display Indication
Er 00 ROM checksum
Er 01 RAM check
Er 02 Keypad failure
Er 03 NOVRAM checksum error
Operating Errors
Operating errors are displays once and then clear after three seconds or when
any controller key is pressed. If error messages Er04 - Er14 persist, the
problem is likely controller board failure. If Er15 is displayed, ensure serial
communications is turned off in the Setup Loop. If Er16 is displayed the unit
needs calibration, contact Thermo for assistance.
Display Indication
Er 04 - 13 Interrupt error
Er 14 Synchronous error
Er 15 Asynchronous error
Er 16 Bad calibration
Latching Errors
In order to restart the unit when a latching error is displayed, the controller's
START/STOP button must be pressed after the condition is cleared.
Display Indication
Lo t Fluid temperature lower than low temp alarm setting.
Hi t Fluid temperature higher than high temp alarm setting.
Er 22 Fluid temperature higher than the high overrange point.
This is a fixed value, factory set at 55°C.
Er 25 RDT1 input shorted.
Er 26 RTD1 input open.
LLF Low level fault switch open for at least three seconds.
PHEr Improper phasing.
OL Pump motor overload.
If any other code appears contact Thermo customer service, see Preface.