Troubleshooting l 6-13
Alarms
• Shutdown (A#): The dryer has automatically shut down because it has detect-
ed a serious problem that could damage your material or dryer.
• Passive (P#): The dryer continues to operate, but warns of a problem that could
prevent correct drying of your material. If ignored, this problem could lead to a
condition that will shut down the dryer.
6
Troubleshooting
Problem
A36 -Control
Communications Watchdog
- The display board has lost
communications
with the control board.
A38 - Phase Error (Phase
Option, STD on MDC's) -
One of the three power wires
is connected wrong, or one or
more phases of power is
missing.
A39 - EEProm Write Error
A41 & P30 - Setback RTD
Integrity - The control can
not sense the regeneration
outlet RTD.
Possible cause
Plugs on wire harness between the
display and control boards are loose or
not wired correctly.
Display board or control board has
failed.
One of the three power wires are out of
phase.
A fuse has blown.
Phase detection board has failed.
Loose wire connection between phase
board and control board.
Internal control board problem.
The connection in the electrical enclo-
sure for the hopper RTD is loose.
The connection of the RTD plug on the
control board is loose.
The setback RTD has failed.
The control board has failed.
The setback RTD connection to the con-
trol box is loose.
Solution
Make sure plugs are tight on board
connections and match the wiring
diagram.
Replace the defective boards.
Switch the position of two of the incom-
ing lead power wires at the dryer.
Check and/or replace the fuse.
Replace the phase detection board.
Make sure wires are correct and secure.
Replace the control board.
Check the RTD plug connection and
tighten if needed.
Check the plug connection and tighten if
needed.
Replace the setback RTD.
Replace the control board.
Check the connection to the receptacle
and tighten if needed.
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