CAP. 16 - MESSAGE AND ALARM CODES 66 / 77 ENGLISH
M
ULTIGAS 8500 PLUS
Alarm messages are coded Axxx in the window title bar.
Alarms immediately terminate the procedure and prevent its resumption.
CODE MESSAGE When it can
occur
Possible causes Actions
A000 EEPROM NOT
WORKING
Electronics
fault
EEPROM
damaged
Replace the logic electronic
board
A001 EEPROM DATA
CORRUPT
Electronics
fault
EEPROM
damaged
Replace the logic electronic
board
A002 PRESSURE SAFETY
SWITCH
ACTIVATED
Pressure
above 18 bar
High pressure in
the internal tank
or circuit
between
compressor and
tank obstructed
or closed.
Verify
If internal vessel
pressure level is over 18
bar, wait for pressure
reduction
disconnect
equipment from the mains,
use safety protection, open
equipment and verify if the
valve between compressor
and internal vessel are
open
A003 ADC NOT
WORKING
Electronics
fault
ADC analog-
digital converter
damaged
Replace the logic electronic
board.
A004 FAN NOT
WORKING
Only during
use with R-
1234yf
Fan not working
properly
(stopped or
fan’s rpm not
adequate)
Stop use of the equipment:
1. check electrical
connections
2. if necessary,
change fan and
related wiring
3. Replace the logic
electronic board.
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