62
HDK-MT350_EN_06
With dewpoint-sensing control
If the measured dewpoint exceeds the preset alarm limit (5 °C (41 °F) above the
switchover value), the displayed dewpoint value is flashing. Error codes and their
causes:
Fault code
Description
Possible cause
Remedy
T
ech
n
ical
p
e
rs
o
n
n
e
l
S
er
vi
ce t
ech
n
ici
an
+20
Upper measuring range
limit exceeded
Drying capacity
exceeded.
See instructions for commissioning.
If the desiccant is wet, replace it.
Error in programme.
Restart programme.
999
Dewpoint sensor
defective
Sensor defective or
irreversibly
contaminated.
Replace sensor.
sens
or
–999
Sensor not powered, or
cable or sensor defective
sensor defective
Sensor, sensor cable
or sensor adapter
defective.
Visual inspection. If necessary,
check 24V voltage supply at
terminals 4 and 6. Replace defective
component(s).
SEr
Display for service
interval. Regular
maintenance tasks must
be carried out.
The display appears
after every 8000
operating hours.
Inform the manufacturer’s service
staff and order the appropriate
service kit. The package includes a
dongle with which you can reset the
operating hours counter after
maintenance has been carried out.
For instructions on how to use the
dongle see the enclosed information
sheet (in the service kit).
