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10.0
Troubleshooting
The following table should give an overview of possible errors and an instruction to check and to repair them.
Error
No sample gas flow
Low temperature alarm
High oxygen readings/ low
pollutant readings
Low readings during calibration
270NH3.MAN.REVD.062019
Possible reason
Filter element plugged
Filter chamber exit port plugged
Insufficient warm-up time
Power disconnected
Control switch defective
Leak
Insufficient calibration gas flow
Page 13 of 17
Check/Repair
Check/ replace filter element
Remove filter element and
inspect exit port. Exit port will be
located at 0° or 180° from the top,
depending on configuration
Ensure power has been applied
to the unit for a minimum of 15
minutes
Ensure power is supplied to the
unit. Check by measuring for AC
voltage on TB1-1 & 2
Verify by measuring for a closed
circuit between TB1-1 & 4
Leaking past the filter cap O-ring:
Remove filter element using the
filter change instructions. Inspect
the O-ring under the filter cap by
removing the 3 screws in the top
of the cap and removing the
aluminum section from the filter
cap plug. The O-ring under the
aluminum cap should be pliable,
undamaged, and seated in its
groove. Replace the O-ring if
necessary.
Leaking blowback solenoid valve:
Block or disconnect the blowback
supply and look for a change in
the analyzer readings.
Loose connection:
Verify all fittings are tight and leak
free
Ensure calibration flow is at least
110% of the sample gas flow
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