Operating Faults; Operating Faults List - geminox Merite ZEM 2-17 C Technical Instructions

1 - OPERATING FAULTS LIST

Display A0
Outside sensor fault
Boiler sensor fault
Flue gas detector fault
Flow sensor 1 fault
Flow sensor 2 fault (plate exchanger
sensor/DHW stratification tank)
Faulty room unit
Violation of the plausibility criteria
(STB related criteria)
Triggering of the underfloor heating
safety thermostat
Maximum flue gas temperature too
high
Burner locks
No flame formed after the safety time
period
LMU internal error
LMU setting error
The minimum speed threshold of the
fan is not reached
The maximum speed threshold of the
fan is exceeded
Communication problem with the
regulator
The service function is active
The regulator shut-down function is
active
Note:
- The last 5 working faults are accessible through
the QAA 73, lines 728 / 729 / 730 / 731 / 732. The
last saved fault code is displayed at line 728.
III - OPERATING FAULTS
Description
- 12 -
Solution
Check that the sensor is correctly fitted and
connected
Check that the sensor is correctly fitted and
connected
Check that the sensor is correctly fitted and
connected
Check that the sensor is correctly fitted and
connected
Check that the sensor is correctly fitted and
connected
Check the connections on the unit
Check that the water flow of the system is
correct (circulating pump, isolation valve, etc.)
Reset the safety thermostat.
Check that the water flow of the system is
correct (circulating pump, isolation valve, etc.)
Check whether the boiler is not on thermal
overload or that the exchanger is not clogged
Position the selector on RESET for at least 1
second.
Check that the gas reaches the boiler (Pi),
check the condition of the gas valve, if there is
a major adjustment fault on the gas valve,
check the condition of the transformer, cables,
ignition electrode, ionisation current value.
Position the selector on RESET for at least 1
second.
Check the A6 code
Check the A6 code
Check the wiring of the fan and LMU, ensure
that the fan is turning correctly
Check the mains supply and the fan cable
connections
Position the mode selector (1, fig. 46 - page 40
- chapter VI - COMMISSIONING -
INSTALLATION MANUAL) to RESET for at
least 1 second. If the fault persists, replace the
LMU.
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