Large Dehumidifying Dryers Troubleshooting 51
7-3 Alarms The Alarm Screen will pop up to show what alarm the dryer is having that moment. Look
through the window on the door to see the screen.
7-4 Alarm Descriptions Alarm
Code Alarm Description Alarm Effect
BV The Main Air Valve did not maintain or find
position.
Possible Motor or Limit Switch Failure.
Immediate
Shut Down
CV The Closed Loop Cooling Valve did not find
position.
Possible Motor or Limit Switch Failure.
Immediate
Shut Down
PS The process supply air temperature switch
opened.
Possible thermocouple failure.
Process
Shut Down
RS The regeneration air temperature switch opened.
Possible thermocouple failure. Regeneration
Shut Down
PH Process air temperature deviation is above high
limit value.
Possible solid state relay failure.
Process
Shut Down
PL Process air temperature deviation is below low
limit value.
Possible heater failure. Alert Only
RH Regeneration air temperature deviation is above
high limit value. Regeneration
Shut Down
DP
The dew point value is above the high limit
value.
Possible ambient air contamination or failed
regeneration cycle.
Alert Only
PB Process blower is not running.
Possible overload fault, contactor fault. Process
Shut Down
RB Regeneration blower is not running.
Possible overload fault, contactor fault. Regeneration
Shut Down
PF or RF Process air filter (PF) or regen air filter (RF)
requires cleaning. Alert Only
PR
The process redundant air temperature
thermocouple is out of range.
Possible thermocouple or solid state relay
failure.
Immediate
Shut Down.