Summary of faults
58
HDK350_EN_01_2005-05-10
Fault
Possible cause
Remedy
Specialised
personnel
Service technician
No expansion in
chamber
Valve V7/V8 does not open properly
see *
Valve V7/V8 does not close properly
Dryer is continuously
bled
Valve V1/V2 does not close properly
see *
Dryer is bled excessively Valves V1/V2, V3, V4, V5, V6 do not
close properly
see *
Check supply voltage.
z
z
Check whether coil is properly mounted.
z
z
Inspect valve for contamination; clean
or replace, if necessary.
z
z
*
Valve fails to open or close properly
Check voltage at cables, contacts and
coils; replace, if necessary.
z
With dewpoint-sensing control (optional)
Fault code
Description of fault
Possible cause
Remedy
Specialised
personnel
Service technician
Drying capacity
exceeded.
See instructions for commissioning.
If the drying agent is wet, replace it.
z
+20
Upper measuring range
limit exceeded
Error in programme.
Restart programme.
z
999
Dewpoint sensor
defective
Sensor defective or
irreversibly
contaminated.
Replace sensor.
z
sens
or
–999
Sensor not powered, or
cable or sensor defective
Sensor, sensor cable
or sensor adapter
defective.
Visual inspection; check power
supply (24 V to terminals 4 and 6).
Replace defective component(s).
z
Summary of Contents for HDK 50/100
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