Troubleshooting/Service; Replaceable Parts - Nelson SmartZone EZ 8504 Guide D'installation Et De Programmation

TROUBLESHOOTING/SERVICE

SYMPTOM
no output to zone, pump or
master valve
no AC and blank display
LCD is blank
LCD is scrambled or is missing
segments
"M-X" appears on the LCD when
trying to run a zone manually
"C-X" appears on the LCD when
trying to CYCLE a program
"S-X" appears on the LCD when
trying to run a 3 MINUTE TEST
The controller won't run a
3 MINUTE TEST
Er1 is displayed on the LCD
Er2 is displayed on the LCD

REPLACEABLE PARTS

• Transformer
• Interconnect ribbon
• Front panel
POSSIBLE CAUSE
• AC disconnected
• no battery or dead battery
• no AC and no battery
• ribbon cable is disconnected
• controller needs to be reset
• MODE dial is in program position
• MODE dial is in program position
• MODE dial is in program position
• No programs on A, B, or C
• This is a communications error between the
micro-controller and the non-volatile memory
• This is telling the user there is more than 24 • Review your total run times on all programs
hours of run time programmed
• 6' AC cord
• Interconnect board
SOLUTION
• check AC source, if AC is not detected
by the controller, the no AC indicator
will be lit
• replace battery and press reset
• install battery to regain use of display,
check AC to ensure output to field
• ensure ribbon cable between the front
panel and controller board is
connected at both ends
• press the reset button. If still
scrambled, press the reset button and
the select + button at the same time
(returns to factory defaults)
• position the MODE dial in the AUTO
position to run a zone manually
• position the MODE dial in the AUTO
position to cycle a program
• position the MODE dial at the AUTO
position to run the 3 Minute Test
procedure
• enter a program with run times for the
zones you need. The 3 MINUTE TEST
only runs those zones with programmed
run times on them
• press reset. If the error does not clear,
replace the board
and correct - OR -
• Press reset and select + at the same
time to return to factory default settings.
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