Appendix
0020230531_01 ecoFIT pure Installation and maintenance instructions
33
Status code
Meaning
S.16
DHW mode: Fan overrun
S.17
DHW mode: Pump overrun
Display in Comfort mode with warm start or hot water handling mode with cylinder
S.20
Hot water handling mode: Requirement
S.21
Hot water handling mode: Advance fan operation
S.22
Hot water handling mode: Pump pre-run
S.23
Hot water handling mode: Burner ignition
S.24
DHW mode: Burner on
S.25
DHW mode: Pump/fan overrun
S.26
DHW mode: Fan overrun
S.27
DHW mode: Pump overrun
S.28
Hot water handling mode: Temporary shutdown of the burner
Other displays
S.30
Room thermostat is blocking heating mode.
S.31
No heating demand: Summer mode, eBUS controller, waiting period
S.32
Fan waiting time: Fan speed outside of the tolerance values
S.33
Forced fan operation until the pressure monitor is switched
S.34
Frost protection active
S.39
Underfloor heating contact open
S.41
Water pressure too high
S.42
Flue non-return flap closed
S.46
Frost protection mode (Comfort): Minimum load
S.53
Product in waiting period/operation block function due to low water pressure (flow/return spread too large)
S.54
Waiting period: Low water pressure in the circuit (flow/return spread too large)
S.76
Maintenance message: Check the water pressure
S.88
Product purging active
S.91
Maintenance: Demo mode
S.96
Automatic test programme: Return temperature sensor, heating demands blocked.
S.97
Automatic test programme: Water pressure sensor, heating demands blocked.
S.98
Automatic test programme: Return temperature sensor, heating demands blocked.
S.99
Internal automatic test programmes
S.108
Purging the combustion chamber, fan in operation
S.109
Product's standby mode activated
C
Overview of fault codes
Note
Since the code table is used for various products, some codes may not be visible for the product in question.
Fault code
Meaning
Possible cause
F.00
Fault: Flow temperature sensor
NTC plug not plugged in or has come loose, multiple plug on the PCB not
plugged in correctly, interruption in cable harness, NTC sensor defective
F.01
Fault: Return temperature sensor
NTC plug not plugged in or has come loose, multiple plug on the PCB not
plugged in correctly, interruption in cable harness, NTC sensor defective
F.10
Short circuit: Flow temperature sensor
NTC sensor defective, short circuit in the cable harness, cable/casing
F.11
Short circuit: Return temperature sensor
NTC sensor defective, short circuit in the cable harness, cable/casing
F.12
and
F.91
Short circuit: Cylinder temperature
sensor
NTC sensor defective, short circuit in the cable harness, cable/casing
F.13
Short circuit: Domestic hot water cylinder
temperature sensor
NTC sensor defective, short circuit in the cable harness, cable/casing
