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Thermo Fisher Scientific
Table 6-1. Troubleshooting - General Guide, continued
Malfunction
Possible Cause
Contaminated cell
Sticky solenoid valve
Photometer does not
Leak
calibrate properly
Bench thermistor defective
Pressure transducer out of
calibration
Dirty system
Defective solenoid
Lamp intensity unstable
Slow response
Averaging time
Leak
Contaminated optical bench
Table 6-2. Troubleshooting - Alarm Messages
Alarm Message
Possible Cause
Alarm - O
Lamp Temp
Defective ozonator board
3
Defective ozonator lamp heater
Alarm - Lamp Temp
Defective photometer board
Defective photometer lamp heater
Alarm - Bench Temp
Defective fan
Check fan filter
Troubleshooting
Troubleshooting Guides
Action
Clean cell.
Replace with known good
solenoid valve.
Perform leak test (see
"Servicing" chapter.
Replace bench thermistor.
Recalibrate pressure
transducer.
Clean cells and flow
components.
Replace solenoid.
Replace detector or
photometer board.
Verify averaging time is set
properly.
Perform leak test (see
"Servicing" chapter).
Clean bench and then
condition system overnight.
Action
Replace ozonator board.
Replace ozonator lamp
heater.
Replace photometer board.
Replace photometer lamp
heater.
Check for 24 VDC on fan
connector and replace fan if
24 VDC is applied to fan.
Clean or replace foam filter
(see "Preventive
Maintenance" chapter).
Model 146i Instruction Manual
6-5
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Troubleshooting
