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11 Troubleshooting
74
Combi 2
Tab.33
List of permanent faults (boiler stoppage, reset required)
DISPLAY
DESCRIPTION OF PERMANENT FAULTS (RESET)
CAUSE – Check/Solution
An installer is required for most checks and
solu tions.
Group
code
Specific
code
E.00
.04
Return temperature sensor disconnected
SENSOR/CONNECTION PROBLEM
Check the operation of the temperature sensor
Check the sensor/PCB connection
E.00
.05
Return temperature sensor short circuited
SENSOR/CONNECTION PROBLEM
Check the operation of the sensor
Check the sensor/PCB connection
E.00
.16
DHW tank temperature sensor not connected
SENSOR OPEN
Check the operation of the sensor
Check
the
sensor/PCB
connection
When removing a domestic hot water tank, set
parameter DP150=1
E.00
.17
DHW tank temperature sensor short-circuited
SENSOR CLOSED
Check the operation of the sensor
Check the sensor/PCB connection
E.00
.20
The flue gas temperature sensor is not connected or
measured a temperature below the range
SENSOR OPEN
Check the operation of the sensor
Check the sensor/PCB connection
E.00
.21
The flue gas temperature sensor has short-circuited
or measured a temperature above the range
SENSOR CLOSED
Check the operation of the sensor
Check the sensor/PCB connection
E.01
.04
Flame loss detected five times in 24 hours
GAS SUPPLY
Check the gas supply pressure
Check the gas valve calibration ELECTRODE
PROBLEM
Check
the
electrode
connection and wiring
Check
the
condition
of
the
electrode
FLUE GAS PIPES
Check the air intake and flue gas exhaust pipes
EXCHANGER
ON
FLUE
GAS
SIDE
BLOCKED
Check the cleanliness of the exchanger MAINS
VOLTAGE
Check the power supply voltage
E.01
.12
Temperature measured by return sensor greater than
flow temperature
SENSOR/CONNECTION PROBLEM
Check that the sensors are positioned the correct
way
around
Check that the flow sensor is in the correct posi-
tion
Check
the
return
temperature
in
the
boiler
Check the operation of the sensors
E.01
.17
No water circulation (permanent)
INSUFFICIENT CIRCULATION
Check the installation pressure
Activate
a
manual
venting
cycle
Check the operation of the pump
Check
the
boiler/installation
circulation
SENSOR ERROR
Check the operation of the temperature sensors
Check the temperature sensor connection
E.01
.20
Maximum flue gas temperature reached
EXCHANGER ON FLUE GAS SIDE BLOCKED
Check the cleanliness of the exchanger
E.02
.13
Total stoppage of the boiler (antifreeze function not
active)
SIGNAL INDICATING BLOCKING INPUT
Contact X15 open, check connected devices
Parameter
configuration
error:
Check
setting
AP001
E.02
.17
Permanent communication failure in the PCB
MAIN PCB ERROR
Check for any electromagnetic interference
Contact the Service Network