6 720 607 072 (16 January)
Troubleshooting
27
Display Cause Solution
E9 Temperature limiter opened circuit
(overheat).
Check connections.*
EA No ionization during safety time (safety
time out).
Check gas pressure.
Check that gas is not diluted with air, as a
result from recent gas pipeline rework.*.
Check if vent terminal is blocked (specially
when the appliance starts up for some
seconds and then looses ionization signal).
Check ionization electrode.*
Check for a proper ground.*
FA Leakage error (gas valves do not close
gas circuit)
Check gas valve and electronic controller.*
F7 Ionization error (flame sensing at stand-
by)
Check electronic controller.*
E0 Internal software/hardware failure. Check electronic controller.*
A7 Hot water temperature sensor/receiver
defect (from main controller)
Check water temperature sensor/receiver and
connections.*
A9 Hot water temperature sensor/receiver
mis-assembled (from main controller)
Check that the water temperature sensor/
receiver is properly assembled in the water
pipe.*
E1 Over-temperature detected (from main
controller)
Check heat exchanger sealings.*
Check heat exchanger and flue gas collector.*
Check over temperature fuse.*
C1 FAN rotation too low at start-up (from
main controller)
Check supply voltage.*
Check fan and connections.*
Check electronic controller.*
C6 FAN rotation too low at operation (from
main controller)
Check supply voltage.*
Check fan and connections.*
Check electronic controller.*
C7 No rotational speed sensor signal from
FAN
Check fan and connections.*
Check electronic controller.*
CA Water flow signal over specified
maximum value
Check water valve and flow sensor.
E2 Inlet temperature sensor fault Check water temperature sensor/receiver and
connections.*
Table 5
* By installer or service technician only.
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