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6.2
Fault Finding Procedure
6.2.1 Fault Code Display Status
If a fault should develop in the temperature measurement system, defrost system, fans or low ambient
heater, a fault code will be shown automatically on the display and the fault audio alarm will sound. At the
same time, the bottom L.E.D. will flash red alternately with the fault L.E.D.(s) When any control button is
pressed, the audio alarm is turned off although the display will continue to be “flashed” instead of the normal
“back-lit” display.
The refrigerator goes through a sequence of tests whenever it is turned on at the power supply or whenever
the door is closed while it is on. It takes 20 seconds to complete the test sequence, and opening a door will
interrupt it. If, for example, there is a fault with the fans/low ambient heater connector at the power module
(it may be unplugged) and a door is opened as soon as the fault audio alarm sounds, the fault code shown
will be code 13 (low ambient heater drawing less current than expected). This is because the low ambient
heater is the first item tested and so the refrigerator will fault for this but carry on with more tests. If the doors
are left closed until the tests are completed, the fault code shown will be code 11 (the current measured for
the ambient heater, PC fan and FC fan is lower than expected). It is therefore recommended that if the fault
audio alarm sounds as soon as the refrigerator is turned on, or as soon as the doors are closed, the service
technician should wait for 20 seconds before opening the door to check the fault code. This will allow the
refrigerator to complete the sequence of tests and will ensure that the fault code displayed is the correct one.
To reset the audio alarm, disconnect the refrigerator from the power supply for a few seconds. If this is not
done, the audio alarm will automatically reset after 72 hours.
Fault codes will be in a binary code and the L.E.D.s that flash will have the following binary values:
To determine the value of the displayed fault code, add up the values of the L.E.D.s that are flashing (ignore
the flashing red L.E.D.). The faults and their respective fault code that can be checked and serviced in the
field are as follows:
Display Code: 1
Reason:
On the last power up, the power/control module failed its self-test.
Primary Action:
Replace power/control module.
Display Code: 2
Reason:
The previous 2 defrosts were aborted after 30 minutes.
Primary Action:
Check defrost heater assembly in the FC. If faulty, replace.
Secondary Action:
Check power module is supplying 230V to heater during defrost. If not, replace
power module.
Display Code: 3
Reason:
The resistance of all the temperature sensors is outside the normal range. (> 45K
Ohms).
Primary Action:
Check the 6 way RAST connector at the power module.
Secondary Action:
Re-terminate the 6 way RAST connector.
Tertiary Action:
Replace the power module.
Mode
Button
Temperature Down
Temperature Up
1
2
4
8
16
32
64
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Summary of Contents for 790 Active Smart
Page 1: ...790 ACTIVE SMART REFRIGERATOR FREEZER 517800...
Page 2: ...2...
Page 42: ...42 8 WIRING DIAGRAM...
