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10 Error Modes
The Control Link ACC has several error modes it
will enter when failures occur. The controller has a
General Status LED that blinks at a 0.5 Hz (1 blink
per second) rate if the microprocessor is running. If
any of the error modes below occur, the green Status
LED will blink at a rate specific to the error condition.
The controller has a Heat LED that illuminates when
the heater is on. In the case of an error condition, the
heater will go into the indicated mode. For each error
mode, note the priority level — if more than one error
mode is active, the LED blink rate will only show the
error condition with the highest priority (priority #1 is
the highest, and priority #5 is the lowest). Note that a
higher priority will mask a lower priority error until
the higher priority is fixed.
10.1. Priority 1: FAIL: OVER
TEMP
The board temperature sensor has determined that
the heater driver is exceeding its maximum
temperature rating. If this condition is detected, the
heater output will be turned OFF. Once the
temperature has fallen at least 5°C (9°F), the heater
will be allowed to come back ON. General Status
LED blinks 5 times: pause - 5 times - pause, and then
repeats.
10.2. Priority 2: FAIL: TEMP
SENS
If the PMAC Algorithm mode is NOT enabled, a
door frame temperature sensor that is open or shorted
is considered to be a failure. The General Status LED
blinks 2 times: pause - 2 times - pause, and then
repeats. If the PMAC Algorithm is enabled, the
General Status LED will continue to blink normally
even if the door frame temperature sensor is not
present. If the door frame temperature sensor is not
present, the Control Link ACC will revert to PMAC
mode for operation.
30 • Control Link ACC I&O Manual
10.3. Priority 3: FAIL: DEWPT
SNS
Cannot communicate with the dewpoint sensor,
and there is no dewpoint data being broadcast. The
ACC will attempt for a duration of 100 seconds to
communicate with a local dewpoint Sensor before
flagging this failure. Once past the first 100 seconds,
the remote timeout is 46 seconds before this error will
occur. If there is no dewpoint sensor, the heater will be
on 95% of the time. The General Status LED blinks 3
times: pause - 3 times - pause, and then repeats.
10.4. Priority 4: FAIL: FLASH/
CLK
Either the Flash executable code has changed or
the hardware clock is not functioning properly. The
General Status LED blinks: short - long - pause, and
then repeats.
10.5. Priority 5: FAIL:
CONFIGURE
The user configuration has an error in the version
stored in flash. The General Status LED blinks: long
- short -pause, and then repeats.
026-4704 Rev 6
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