5. TROUBLESHOOTING
©2014 Kraus Global Ltd.
Retail CNG Dispenser Manual
43
Table 5.2:
MICON
®
Fault Codes
Fault Code
Description
Possible Cause
Recommended Action
28 DISP1 DC
Display 1
disconnect
Display has been disconnected or
failed.
Check display power connector. Check display
communications connector. Check display power supply
barrier.
29 EEPROM
EEPROM
checksum
mismatch
Settings have become correpted.
Software has been updated and
settings have changed.
Re-configure settings from defaults. If problem reoccurs
frequently, repair/replace main board.
31 DISP2 DC
Display 2
disconnect
Display has been disconnected or
failed.
Check display power connector. Check display
communications connector. Check display power supply
barrier.
40 PWR FAIL
Power failed
during fill
Power failure during a fill
After clearing the fault, transaction data is loaded from
meter and displayed.
51 EXC FLOW Excess flow
detected
Ruptured hose Flkow rate has
exceed MICON
®
max flow setting
Check hose for ruptures or other damage. If no hose damage
is present, max flow setting may need to be adjusted.
76 P1 RANGE Pressure
transducer 1 out
of range
Pressure transducer has gone
below 3.8mA or above 21mA
Check pressure transducer wiring. Check pressure display
on secondary display. If the pressure fluctuates more than
50 psi when the dispenser is static, then replace
transmitter. If pressure reading is not fluctioating, but is
reading differently than the pressure gauge check that the
MICON
®
pressure full scale setting matches the full scale of
the transmitter.
77 P2 RANGE Pressure
transducer 2 out
of range
Pressure transducer has gone
below 3.8mA or above 21mA
Check pressure transducer wiring. Check pressure display
on secondary display. If the pressure fluctuates more than
50 psi when the dispenser is static, then replace
transmitter. If pressure reading is not fluctioating, but is
reading differently than the pressure gauge check that the
MICON
®
pressure full scale setting matches the full scale of
the transmitter.
78 AT RANGE Ambient
temperature
sensor out of
range
Ambient temperature sensor has
gone outside of the MICON
®
operating temperature range
−40
o
C
to +50
o
C
If the temperature range has actually been exceeded,
shutdown the dispenser until the ambient temperature is
back within the recommended operating temperature
range. If the ambient temperature is incorrect, check wiring
of ambient temperature probe. If wiring is good, then
replace temperature probe.
79 GT RANGE Gas temperature
out of range
Gas temperature has exceeded
mass flow meter operating range
−50
o
C
to +50
o
C
Wait for gas temperature to recover. If gas temperature is
not correct, then reset/replace mass flow meter.
91 MET1 NC
Meter 1 not
connected
Meter is not connected or not
responding. Meter has an
incorrectly programmed address
Check mass flow meter wiring. Confirm that meter is
powered (LED inside meter should be lit or blinking) If
meter is powered but not communicating, perform meter
marriage procedure. If meter marriage fails, check if meter
communications A/B are reversed.
92 MET2 NC
Meter 2 not
connected
Meter is not connected or not
responding. Meter has an
incorrectly programmed address
Check mass flow meter wiring. Confirm that meter is
powered (LED inside meter should be lit or blinking) If
meter is powered but not communicating, perform meter
marriage procedure. If meter marriage fails, check if meter
communications A/B are reversed.
93 MET1 SC
Meter 1 short
circuit/excess
load
Mass flow meter has drawn
excessive load or short circuited.
Check meter wiring. Reboot dispenser. If problem persists
or reoccurs frequently, replace mass flow meter.
94 MET2 SC
Meter 2 short
Mass flow meter has drawn
Check meter wiring. Reboot dispenser. If problem persists
