DeDietrich 24 Installation And Service Manual page 205

DISPLAY
DESCRIPTION OF TEMPORARY FAULTS
Group Specific
code code
H.03 .05 Power supply voltage too low
Temporary flame loss
H.03 .54 Shutdown due to the power supply voltage being too
low
Tab.122 List of permanent faults (boiler stoppage, reset required)
DISPLAY
DESCRIPTION OF PERMANENT FAULTS (RESET)
Group Specific
code code
E.00 .04 Return temperature sensor disconnected
E.00 .05 Return temperature sensor short circuited
E.00 .16 DHW tank temperature sensor not connected
E.00 .17 DHW tank temperature sensor short-circuited
The flue gas temperature sensor is not connected or
E.00 .20
measured a temperature below the range
The flue gas temperature sensor has short-circuited
E.00 .21
or measured a temperature above the range
E.01 .04 Flame loss detected five times in 24 hours
Temperature measured by return sensor greater than
E.01 .12
flow temperature
7804841 - 02 - 20012022
CAUSE – Check/Solution
An installer is required for most checks and solu­
tions.
Check the mains voltage
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 termi­
nal
Check the power supply voltage
CAUSE – Check/Solution
An installer is required for most checks and solu­
tions.
SENSOR/CONNECTION PROBLEM
Check the operation of the temperature sensor
Check the sensor/PCB connection
SENSOR/CONNECTION PROBLEM
Check the operation of the sensor
Check the sensor/PCB connection
SENSOR OPEN
Check the operation of the sensor
Check the sensor/PCB connection
When removing a domestic hot water tank, set
parameter DP150=1
SENSOR CLOSED
Check the operation of the sensor
Check the sensor/PCB connection
SENSOR OPEN
Check the operation of the sensor
Check the sensor/PCB connection
SENSOR CLOSED
Check the operation of the sensor
Check the sensor/PCB connection
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
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
en
11 Troubleshooting
INIDENS 205