54
Installation and maintenance instructions ecoTEC exclusive 0020193966_04
Code
Parameter
Possible causes
F.72
Fault: Flow/return sensor
Flow/return NTC temperature difference too great
→
flow and/or return
temperature sensor defective
F.73
Fault: Water press. sensor
Interruption/short circuit of water pressure sensor, interruption/short
circuit to GND in supply line to water pressure sensor or water pressure
sensor defective
F.74
Fault: Water press. sensor
The line to the water pressure sensor has a short circuit to 5 V/24 V or
internal fault in the water pressure sensor
F.75
Fault: Pump/ water shortage
Water pressure sensor and/or pump defective, air in the heating installa-
tion, insufficient water in the product; connect external expansion vessel
to the return
F.77
Fault: Flue non-ret. valve/condens. pump
No response from flue non-return flap or condensate pump defective
F.78
Interrupt.: DHW outlet sensor on ext. contr.
UK link box is connected but the domestic hot water NTC is not bridged
F.80
Fault: actoSTOR inlet sensor
Only in conjunction with F.91
NTC defective, NTC cable defective, defective plug connection on NTC,
defective plug connection on the
actoSTOR
electronics
Sensor plug has short to earth to the housing, short circuit in cable har-
ness, sensor defective
F.81
Fault: cylinder charging pump
Only in conjunction with F.91
Cylinder is not fully charged after specified time.
–
Check cylinder charging sensor and cylinder sensor
–
Air in the
actoSTOR
pump
–
Inspect cable harness for pump
–
Check the impeller sensor and/or limiter in the product
–
Prioritising diverter valve defective
–
Secondary heat exchanger blocked
–
Pump defective
F.82
Fault: Ext. current anode
External current anode not connected:
–
X43 edge connector with bridge missing from the PCB
External current anode connected:
–
Power supply to the external current anode was interrupted
–
Cable between PCB and external current anode defective
–
External current anode defective
F.83
Fault: NTC temp. gradient
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: NTC temp. diff. 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: NTCs fitted incorrectly
The flow and/or return temperature sensors have been installed on the
same pipe/incorrect pipe
F.90
Fault: Communication
Check the cable harness from the product to the
actoSTOR
module
(PEBus).
If the product is to be operated without an
actoSTOR
module, set
D.092
= 0.
F.94
Fault: Vortex and differential pressure
Check: Pump (function), cable harness, plug, sensors.
LED
actoSTOR
module
actoSTOR electronics status
LED on: Communication OK
LED flashing: Communication not OK
LED off: No power supply
Commu-
nication
fault
Communication fault
Communication fault between display and PCB in the electronics box
