MAN.270SF.REVB.102018
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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
(is not valid for the starting-up period of cooler).
Error
Possible reason
Check/Repair
No sample gas flow
Filter element plugged
Filter chamber exit port plugged
Check/ replace filter element
Remove filter element and
inspect exit port. Exit port will be
located at 0° or 180° depending
on configuration
Low temperature alarm
Insufficient warm-up time
Power disconnected
Control switch defective
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
High oxygen readings/ low
pollutant readings
Leak
Leaking past the filter element O-
Rings. Remove filter element and
inspect O-Rings. There are two
O-Rings, one located at the base
of the filter element and the other
in the cap. Ensure both are
pliable and seated in their
respective grooves
Leaking blowback solenoid valve.
Block or disconnect the blowback
supply
Loose connection Verify all
fittings are leak free
Low readings during calibration
Insufficient calibration gas flow
Ensure calibration flow is at least
110% of the sample gas flow
