Code Text display Description Recommendation
E02.35 Safety device lost Safety critical device has been
disconnected
Check the PCB.
E02.39 AF low presure rise No sufficient rise of pressure after
autofilling
The water pressure in the system has not risen
sufficiently during the automatic filling procedure:
Check the system for leaks.
Check the water pressure in the system.
Check that the inlet gas valve is fully open.
Check that the main water valve is fully open.
Check the operation of the pressure sensor.
Check the operation of the safety valve.
E02.47 Failed Conn Funct Gr Failed Connecting Function Groups Function group not found:
Carry out an auto-detect
E02.78 Dhw Dcw swap The domestic cold water and the
domestic hot water connections are
swapped
Check that the central heating pipes and DHW
pipes have not been reversed.
E04.00 Parameter error Safety parameters Level 5 are not
correct or missing
Replace the control unit if it is defective.
E04.01 TFlow Closed Flow temperature sensor is either
shorted or measuring a temperature
above range
Flow temperature sensor short circuited:
Bad connection: check the wiring and connec
tors.
Incorrectly fitted sensor: check that the sensor
has been correctly fitted.
Faulty sensor: replace the sensor.
E04.02 TFlow Open Flow temperature sensor is either
removed or measuring a
temperature below range
Flow temperature sensor open:
Bad connection: check the wiring and connec
tors.
Faulty sensor: replace the sensor.
E04.03 Max Flow temp Measured flow temperature above
savety limit
Maximum heat exchanger temperature increase
has been exceeded:
No flow or insufficient flow:
Check the circulation (direction, pump,
valves).
Check the water pressure.
Check the cleanliness of the heat exchanger.
Check that the installation has been correctly
vented to remove air.
Sensor error:
Check that the sensors are operating correct
ly.
Check that the sensor has been fitted proper
ly.
E04.07 TFlow Sensor Deviation in flow sensor 1 and flow
sensor 2 detected
Flow temperature sensor deviation:
Bad connection: check the connection.
Faulty sensor: replace the sensor.
11 Troubleshooting
7686707 - v.01 - 06092018 AMC 119
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