Appendix
34 Installation and maintenance instructions Energy 2 0020283671_03
Status code Meaning
S.30 Room thermostat is blocking heating mode.
S.31 No heating demand: Summer mode, eBUS control, 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/operating block function due to water deficiency (flow/return spread too large)
S.54 Waiting period: Water deficiency 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
D 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/housing
F.11 Short circuit: Return temperature sensor NTC sensor defective, short circuit in the cable harness, cable/housing
F.12 and
F.91
Short circuit: Cylinder temperature
sensor
NTC sensor defective, short circuit in the cable harness, cable/housing
F.13 Short circuit: Domestic hot water cylinder
temperature sensor
NTC sensor defective, short circuit in the cable harness, cable/housing
F.20 Safety shutdown: Overheating temperat-
ure reached
Incorrect earth connection between cable harness and product, flow or return
NTC defective (loose connection), stray spark via ignition cable, ignition plug
or ignition electrode
F.22 Safety shutdown: Water deficiency in the
boiler
No or insufficient water in the product, water pressure sensor de-
fective, cable to the pump or to the water pressure sensor loose/not
connected/defective
F.23 Safety shutdown: Temperature spread
too great (NTC1/NTC2)
Pump blocked, insufficient pump output, air in product, flow and return NTC
sensors connected the wrong way round
F.24 Safety shutdown: Temperature rise too
fast
Pump blocked, insufficient pump output, air in product, system pressure too
low, non-return valve blocked/incorrectly installed
F.25 Safety shutdown: Flue gas temperature
too high
Break in plug connection for optional flue gas safety cut-out (SCO), break in
cable harness
F.27 Safety shutdown: Fault in flame detec-
tion
Moisture on the electronics, electronics (flame monitor) defective, gas solen-
oid valve leaking
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