Problem
Delivery Heater High
Temperature – The snap
switch in the delivery heater
tube opens due to excessive
temperature.
Delivery RTD Integrity – If
the delivery RTD is faulty, it
shuts down the dryer.
Possible cause
There is an airflow blockage or loose
hoses.
The delivery blower is not running or run-
ning in the wrong direction.
The isolation contactor failed in the
closed position.
The delivery heater output on the board
has failed.
The heater solid state relays (SSRs) failed.
The delivery RTD connection to the con-
trol box is loose.
The connection in the electrical enclosure
for the delivery RTD is loose.
The connection of the RTD plug on the
control board is loose.
The delivery RTD has failed.
The control board has failed.
Solution
Locate and remove any airflow restric-
tions.
Tighten any loose hoses.
Correct the cause of the non-running
blower (blown fuse, etc.) or reverse the
rotation of the blower.
Replace the isolation contactor.
Replace the board.
Replace the failed heater solid state
relays (SSRs).
Check the connection to the receptacle
and tighten if needed.
Check the RTD plug connection and
tighten if needed.
Check the plug connection and tighten if
needed.
Replace the delivery RTD.
Replace the control board.
When supplied for central
drying applications, these
shutdown alarms are not
available.
6
Tr ou bleshooti ng
S h u t d o w n Al a rm s
If an alarm occurs, a red dialog box is displayed on the dryer’s touch screen control. The
dryer will shut down automatically to prevent damage to the equipment or personnel. The
dialog box will indicate whether the alarm is a shut down alarm or a passive alarm.
Tr o u b l es h oo t in g l 6- 9
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