BOILER DISPLAY
DESCRIPTION OF TEMPORARY FAULTS
CAUSE
Check / Solution
Group
code
Specific code
H.02 .09 Partial stoppage of the boiler
SIGNAL INDICATING BLOCKING INPUT ACTIVE
OR FROST PROTECTION ACTIVE
External cause: remove the cause
Parameter configuration error: check parameters
Faulty wiring connection: check wiring
H.02 .10 Complete stoppage of the boiler
BLOCKING INPUT SIGNAL
(WITHOUT FROST PROTECTION)
External cause: remove the cause
Parameter configuration error: check parameters
Faulty wiring connection: check wiring
H.02 .12
Opening of the control unit input signal contact
from the external device
-
H.02 .38 No water hardness Not possible
H.02 .70 External unit heat recovery test failed SCB-09 board error
H.03 .00 No identification data for boiler safety device.
MAIN PCB ERROR
Replace the main PCB
H.03 .01
Communication failure in comfort circuit (internal
fault in boiler PCB).
MAIN PCB ERROR
Replace the main PCB
H.03 .02 Temporary flame loss ELECTRODE PROBLEM
Check the electrode connection and wiring
Check the condition of the electrode
GAS SUPPLY
Check the gas supply pressure
Check the gas valve calibration
FLUE GAS PIPES
Check the pipes and the terminal
H.03 .05 Power supply voltage too low Check the mains voltage
H.03 .17 Periodic safety check in progress -
H.03 .54
Temporary flame loss
Shutdown due to the power supply voltage being
too low
ELECTRODE PROBLEM
Check the electrode electrical connections
Check the condition of the electrode
GAS SUPPLY
Check the gas inlet pressure
Check the gas valve calibration
FLUE GAS EXHAUST PIPE
Check the air intake and flue gas exhaust terminal
Check the power supply voltage
Tab.34 List of permanent faults (boiler stoppage, reset required)
SHOWN ON BOILER
DISPLAY
DESCRIPTION OF PERMANENT FAULTS THAT
REQUIRE RESETTING
CAUSE
Check / Solution
Group
code
Specific
code
E.00 .04 Return temperature sensor disconnected
SENSOR/CONNECTION PROBLEM
Check the operation of the temperature sensor
Check the connection of the sensor/PCB
E.00 .05 Return temperature sensor short circuited
SENSOR/CONNECTION PROBLEM
Check the operation of the sensor Check the
sensor/PCB connection
E.00 .06 Return sensor expected but not detected -
E.00 .07 The difference in return temperature is too great -
E.00 .16 DHW tank temperature sensor not connected
SENSOR OPEN
Check the operation of the sensor
Check the sensor/PCB connection
E.00 .17 DHW tank temperature sensor short-circuited
SENSOR CLOSED
Check the operation of the sensor
Check the sensor/PCB connection
11 Troubleshooting
74 600 Combi 2
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