Section 7 - Trouble Shooting Guide
Problem
Possible Causes
Solution
Excessive Pressure Drop
Low inlet pressure.
Lower flow rate to system.
Switching valve failure.
Check tower-operating sequence to
verify and identify which valves are
operating.
Desiccant breakdown
Change desiccant
Clogged filters
Change filter elements
Valve shut
Open valve
Repressurization Failure or Purge
Failure/ Tower Back-pressure
Purge flow control valve orifice clogged.
Clean or replace.
Failed check valve.
Replace.
Purge exhaust solenoid valve failure.
Turn dryer off, check connections to
PLC, inspect valve and solenoid,
replace if necessary.
Purge exhaust muffler clogged.
Clean or replace.
Controller screen on unit not running
Insufficient / low voltage
Check voltage to and from transformer.
Supply correct voltage to unit.
