Appendix
0020209591_01 ecoTEC plus Installation and maintenance instructions 49
Code Meaning Cause
F.74 Water pressure sensor signal outside cor-
rect 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: No pressure change detection when
starting pump
Water pressure sensor and/or pump defective, air in the heating installa-
tion, insufficient water in the product; check adjustable bypass, connect
external expansion vessel to the return
F.77 Fault: Flue non-return flap/condensate
pump
No response from flue non-return flap or condensate pump defective
F.78 Interruption to DHW outlet sensor at the
external controller
UK link box is connected, but hot water NTC not bridged
F.80 Interruption or short circuit of secondary
heat exchanger inlet sensor; only in con-
nection with F.91
NTC defective, NTC cable defective, defective plug connection on NTC,
defective plug connection on actoSTOR electronics
Sensor plug has short to earth to the casing, short circuit in cable har-
ness, sensor defective
F.81 actoSTOR charging pump defective; only in
combination 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
– Diverter valve defective
– Secondary heat exchanger blocked
– Pump faulty
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 tem-
perature 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.90 Communication with actoSTOR module
interrupted
Check cable harness from product to actoSTOR module (PEBus).
If the product is to be operated without an actoSTOR module, set
D.092 = 0.
F.91 Sensor/actuator fault on actoSTOR module
F.92 Coding resistance fault The coding resistance 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 Poor combustion quality Combustion regulation has detected poor combustion quality
– Incorrect gas restrictor has been installed for the gas family (another
gas family is present)
– Recirculation
– Mass flow sensor/Venturi defective (wet, blocked): Do not wet the
sensor, do not use any lubricants on the O-ring on the Venturi.
LED
actoSTOR
module
actoSTOR electronics status LED on: Communication OK
LED flashing: Communication not OK
LED off: No power supply
Commu-
nication
fault
No communication with the PCB Communication fault between display and PCB in the electronics box
To Next Page
Loading...
