22
METEO GREEN HE R.S.I.
Fault codes: WATER
CODE
TYPE
MEANING
41
Temporary
Too little water pressure in the appliance:
this alarm is generated because the CH
system pressure level drops below 0,3 bar.
The burner is switched off during this 60 seconds.
If the pressure goes over 0,4 bar within 60 seconds the boiler will work normally,
otherwise will become fault code 40.
NO
YES
42
Final
Water pressure transducer fault:
this alarm is generated when the transducer gives
to the PCB immediately (without passing through the previous two alarms) a value of
tension out of range correspondent to a pressure of 0 or 6 bar (short circuit or open
circuit). The 4-digits display will show “----“.
Check: wiring harness or water pressure transducer defected.
YES
YES
Fault codes: PCBs
CODE
TYPE
MEANING
50-51
52-53
54-55
56-57
58-59
Final
Internal failure:
they can be related to EEPROM read/write error or error reading
parameters or internal fault PCB.
For all these fault codes, check the parameters setting and wiring connections.
If the problem still remain replace PCBs.
YES
YES
60
Temporary
Domestic hot water sensor NTC3 short circuit or open circuit:
it’s generated
because the DHW sensor NTC3 value has been continuously (over 120°C or under
-10°C) for more than 2 seconds.
The alarm will automatically reset if the temperature will return for more than 2 seconds
within the limits (118°C or -8°C).
The fault will be shown ONLY when the boiler is in stand-by mode, and ONLY if the
PARAMETER 10 is set to 1, 2 or 4.
The boiler will continue to produce DHW, but modulating on the FLOW NTC1 sensor
at a fix value of 55°C, switching off at 60°C and switching on at 55°C. (SURVIVOR
FUNCTION)
NO
YES
Fault codes: TEMPERATURE PROTECTIONS
CODE
TYPE
MEANING
70
Final
Flow NTC1 sensor short circuit or open circuit:
it is generated when the detected
value of the flow NTC1 sensor stays continuously for more than 2 seconds out of range:
T1 > 120°C NTC1 short circuit
T1 < -10°C NTC1 open circuit
The burner is switched off because of protection.
It’s necessary to reset the boiler by pressing the RESET button.
YES
YES
71
Temporary
Maximum flow NTC1 temperature reached:
it is generated when the detected value of
the flow NTC1 sensor is:
T1 > 95°C if the burner is on during modulation phase
Each next block is updated an OVER TEMPERATURE COUNTER with 0,25 seconds
The burner is on during this time.
NO
NO
72
Final
Return NTC2 sensor short circuit or open circuit:
it is generated when the detected
value of the return NTC2 sensor stays continuously for more than 2”
T2> 120°C NTC2 short circuit
T2 < -10°C NTC2 open circuit
The burner is switched off because of protection.
It’s necessary to reset the boiler by pressing the RESET button.
YES
YES
74
Final
DT1/dt too high or dT2/dt too high (no water circulation):
every time that the burner
is on and the system start modulating, the boiler checks the flow temperature and return
temperature.
After 6 seconds checks again both temperatures.
The alarm is generated if one or both temperatures increased too fast within the first 6
seconds:
dT1/dt > 15°C (dT1 MAX delta) the burner is switched off and blocked.
dT2/dt > 12°C (dT2 MAX delta) the burner is switched off and blocked.
It’s necessary to reset the boiler.
Post pump time during 60 seconds.
YES
NO
(continued)
