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Thermo Scientific
Problem
Possible Cause
Flow, pressure or
Diaphragm or valve plates
vacuum are too low,
are worn or dirt in the head
or: pump produces no
flow
Connections or lines are
blocked
An external valve is closed
or a filter blocked
There is a leak at a
connector, in a line or in the
pump head
Liquid (condensate) has
collected in the pump head
Pump cable not seated
The cross-section of
pneumatic lines, or
connected components are
too small or they are
restricted
Alarm – board
Internal cables not
communication
connected properly
failure
Alarm – power
Internal cables not
supply
connected properly
Cell A or B frequency
Light adjustment
(Photometer)
Defective detector
Cell A and B
Lamp supply
frequency (Ozone)
Cell A or B frequency
Light adjustment
low or zero
One cell excessively
contaminated
Defective detector
Cell A and B
Dirty cells
frequency low or zero
Light adjustment
Troubleshooting
Troubleshooting Guide
Action
Rebuild or replace pump.
Let the pump run for a few minutes
pumping air.
Remove the external filter or valve to
see if the flow comes back into spec.
Find and repair leak.
Clean and dry. Pump may need
replacement.
Verify the pump cable is properly
seated into the Step POL board.
The pump is not designed for this
condition.
Verify cables to DMC PCB are seated
properly. Replace DMC PCB if
necessary.
Verify cables to DMC PCB are seated
properly. Replace DMC PCB if
necessary.
Readjust Lamp setting from the
"Photometer Bench Settings" menu.
Interchange detectors at Photometer
DMC PCB connectors to determine if
detector is defective.
Readjust lamp setting from the
"Photometer Bench Settings" menu.
Clean cell.
Interchange detectors at photometer
DMC PCB connectors to determine if
detector is defective.
Clean cells.
49iQ Instruction Manual
6-3
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