Control Unit Locking Codes - DeDietrich AMC 15 Installation And Service Manual

Code Text display
H03.02 Flame loss detected
H03.05 Internal blocking
H03.17 Safety check
Tab.82 CU-GH08 locking codes
Code Text display
E00.04 TReturn Open
E00.05 TReturn Closed
E00.06 TReturn Missing
E00.07 dTReturn Too High
E00.16 DHW sensor Open
7686707 - v.01 - 06092018
Description
Measured ionisation current is below
limit
Gas Valve Control internal blocking
occured
Periodically safety check ongoing
11.1.3

Control unit locking codes

Description
Return temperature sensor is either
removed or measures a temperature
below range
Return temperature sensor is either
shorted or measures a temperature
above range
Return temperature sensor was
expected but not detected
Return temperature difference is too
large
Domestic Hot Water tank
temperature sensor is either
removed or measures a temperature
below range
Recommendation
No flame during operation:
No ionisation current:
Purge the gas supply to remove air.
Check whether the gas tap is properly open.
Checking the gas supply pressure.
Check the operation and setting of the gas
valve unit.
Check that the air inlet and flue gas dis­
charge flues are not blocked.
Check that there is no recirculation of flue
gases.
Security kernel error:
Restart the boiler
Replace the CU-GH08 control panel
-
Recommendation
Open circuit in return temperature sensor:
Bad connection: check the wiring and connec­
tors.
Incorrectly fitted sensor: check that the sensor
has been correctly fitted.
Faulty sensor: replace the sensor.
Return temperature sensor short-circuited:
Bad connection: check the wiring and connec­
tors.
Faulty sensor: replace the sensor.
No connection to temperature return sensor:
Bad connection: check the wiring and connec­
tors.
Faulty sensor: replace the sensor
Difference between the flow and return tempera­
tures too great:
No circulation:
Vent the air from the CH system
Check the water pressure
If present: check the boiler type parameter
setting
Check the circulation (direction, pump,
valves)
Check that the heating pump is operating
correctly
Check the cleanliness of the heat exchanger
Sensor not connected or incorrectly connected:
Check that the sensors are operating correct­
ly
Check that the sensor has been fitted proper­
ly
Faulty sensor: replace the sensor if necessary
Calorifier sensor open:
Bad connection: check the wiring and connec­
tors.
Faulty sensor: replace the sensor.
11 Troubleshooting
AMC 117