Appendix
52
Installation and maintenance instructions auroCOMPACT 0020233500_01
Code
Meaning
Cause
F.74
Water pressure sensor signal outside correct
range (too high)
Line to water pressure sensor has a short circuit to 5 V/24 V or internal
fault in the water pressure sensor
F.75
Fault: Insufficient throughput on pump start-up.
Pump defective, air in heating installation, too little water in unit, mass
flow sensor defective
F.77
Fault: Flue non-return flap/condensate pump
No response from flue non-return flap or condensate pump defective
F.82
External current anode fault (if installed as an
accessory)
Anode connection or external current anode PCB defective
F.83
Fault: Flow and/or return temperature sensor
temperature change
When the burner starts, the temperature change registered at the flow
and/or return temperature sensor is non-existent or too small
–
Insufficient water in product
–
Flow or return temperature sensor not in correct position at pipe
F.84
Fault: Flow/return temperature sensor temperat-
ure difference implausible
Flow and return temperature sensors returning implausible values.
–
Flow and return temperature sensors have been inverted
–
Flow and return temperature sensors have not been correctly in-
stalled
F.85
Fault: Flow and return temperature sensors
incorrectly installed
The flow and/or return temperature sensors have been installed on the
same pipe/incorrect pipe
F.86
Fault: Floor contact
Safety thermostat when underfloor heating is switched on: Setting the
target heating value
F.90
Fault: No communication between SMU and
BMU
Interruption between BMU and SMU, faulty product code
F.92
Gas coding resistor fault
The coding resistor on the PCB does not match the entered gas group:
Check the resistance, repeat the gas family check and enter the correct
gas group.
F.93
Gas group fault
Combustion quality outside the permitted range: Incorrect gas injector,
recirculation, incorrect gas group, internal pressure measuring point in
Venturi blocked (do not use lubricant on the O-ring in the Venturi).
Commu-
nication
fault
No communication with the PCB
Communication fault between display and PCB in the electronics box
F.1018
Actuation fault in solar pump no. 1
Pump control cable harness disconnected.
F.1019
Actuation fault in solar pump no. 2
Pump control cable harness disconnected.
F.1020
Safety shutdown: Temperature cut-out
Solar cylinder temperature too high.
F.1021
Dry running of solar pump no. 1
Lack of solar fluid in solar circuit.
F.1022
Dry running of solar pump no. 2
Lack of solar fluid in solar circuit.
F.1070
Configuration fault in the SMU solar PCB
Incorrect coding resistor identified
F.1273
Electronics fault in solar pump 1
Connection fault, fault in pump PCB
F.1274
Electronics fault in solar pump 2
Connection fault, fault in pump PCB
F.1276
Solar pump 1 blocked
Solar pump 1 defective
F.1277
Solar pump 2 blocked
Solar pump 2 defective
F.1278
Panel sensor fault
Sensor incorrectly connected or defective
F.1279
Fault in sensor on lower part of cylinder
Sensor incorrectly connected or defective
