AEC WD 350 through WD3000 Dehumidifying Dryers - Manual (Page 62)

Figure 18
Level 1 Controller Error Messages
Note: The temperature controller has self-diagnostic functions, and displays the following error
messages to simplify troubleshooting:
Message Cause Controller output
FFF
1) Temperature has risen beyond
temperature scale range.
2) Thermistor has been short-circuited.
OFF during heating (reverse) action
ON during cooling (normal) action
---
1) Temperature has fallen below
temperature scale range.
2) Thermistor has broken.
ON during heating (reverse) action
OFF during cooling (normal) action
FFF
(blinks)
1) Failure has occurred in thermocouple of
platinum resistance thermometer.
2) Temperature has risen much beyond
scale range.
OFF
---
(blinks )
1) Failure has occurred in platinum
resistance thermometer.
2) Polarities (positive and negative) of
thermocouple have been reversed.
3) Temperature has fallen much below
scale range.
OFF
E 1 1
or
E33
1) Memory failure (
E 1 1
[E11] display).
2) Analog-to-digital converter failure (
E33
[E33] display). Repair temperature
controller if recovery is not made; turn
power off once and on again.
Both controller output and alarm
output are
OFF
Key operations are disabled.
Note: When using alarm outputs, an alarm output actuates when
FFF
and
---
messages
display. These display messages indicate when the temperature rises beyond or falls
below the temperature scale range.
Operation when Sensor Fails
Thermocouple Type
Condition Display Controller output
Break in sensor.
FFF
(blinks)
OFF
Note: When the output short-circuits, the ambient temperature displays.
WDMR and WDFR Series Dehumidifying Dryers Page 61