10
Fig 3
CONTROL BOARD FAULT CONDITIONS AND DISPLAY
Fault conditions are recognized and displayed by the Upper LED display panel
Only overheating and overcooling conditions are displayed at the element LEDs.
These conditions are likely the result of poor air flow resulting from dirty air
filters.
All other conditions are displayed by the LED located on the backside of the LED
panel.
Simply count the number of flashes at the single element panel fault LED and
refer to the chart below.
NOTE, to view the LED panel fault indicator LED the front control cover must be
removed.
This sequence should only be performed by a qualified contractor.
WARNING, HIGH VOLTAGE IS PRESENT IN THE CONTROL
COMPARTMENT, SERIOUS INJURY OR DEATH MAY RESULT
IF PROPER PRECAUTIONS ARE NOT FOLLOWED.
Fault
Number
Element LED
Resulting
Condition
Flashes
Flashes
Controller Action
Excessive fan
1
none
All outputs turned off
motor amp draw
Alarm relay on
Alarm beeper on
No current draw
2
none
All outputs turned off
At fan motor
Alarm relay on
Alarm beeper on
Failed RA sensor
3
none
Failed RAR sensor
4
none
Failed DA sensor
5
none
Failed DAR sensor
6
none
Failed CT sensor
7
none
Overheating
8
Element 1
Overcooling
9
Element 2
Crfitical Overheat
10
Element 1 & 2
Thermostat error
11
none
Summary of Contents for ALPHA
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