Appendix
0020181421_04 ecoCOMPACT Installation and maintenance instructions 51
Status code Meaning
S.96 Return sensor test running, heating demands are blocked.
S.97 Water pressure sensor test running, heating demands are blocked.
S.98 Flow/return sensor test running, heating demands are blocked.
S.105 Low heating flow rate, carry out purging P00 again. (Proklima)
F Overview of fault codes
Applicability: ecoCOMPACT
Code Meaning Cause
F.00 Flow temperature sensor interruption NTC plug not plugged in or has come loose, multiple plug on the PCB
not plugged in correctly, interruption in cable harness, NTC defective
F.01 Return temperature sensor interruption NTC plug not plugged in or has come loose, multiple plug on the PCB
not plugged in correctly, interruption in cable harness, NTC defective
F.03 Cylinder sensor fault NTC defective, NTC cable defective, defective plug connection on NTC
F.10 Flow temperature sensor short circuit NTC defective, short circuit in cable harness, cable/housing
F.11 Return temperature sensor short circuit NTC defective, short circuit in cable harness, cable/housing
F.13 Cylinder sensor short circuit NTC defective, short circuit in cable harness, cable/housing
F.20 Safety shutdown: Temperature cut-out Incorrect earth connection between cable harness and unit, flow or re-
turn NTC sensor defective (loose connection), stray spark via ignition
cable, ignition plug or ignition electrode. Pump blocked, air present.
F.22 Safety shutdown: Water deficiency No or insufficient water in the product, water pressure sensor defective,
cable to pump or water pressure sensor loose/not connected/defective
F.23 Safety shutdown: Temperature spread too great Pump blocked, insufficient pump output, air in product, flow and return
NTC 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 limiter
(accessory for Austria) or other safety compon-
ents on the pre-fitted plug on X20
NTC defective, short circuit in cable harness, cable/housing
F.26 Fault: Gas valve assembly without function Gas valve assembly stepper motor not connected, multiple plug on the
PCB not plugged in correctly, interruption in cable harness, gas valve
assembly stepper motor defective, electronics defective
F.27 Safety shutdown: Recording incorrect flames Moisture on the electronics, electronics (flame monitor) defective, gas
solenoid valve leaking
F.28 Failure during start-up: Ignition unsuccessful Gas meter defective or gas pressure monitor has triggered, air in gas,
gas flow pressure too low, thermal isolator device (TAE) has triggered,
condensate route blocked, incorrect gas injector, incorrect spare part
gas valve assembly, fault on the gas valve assembly, multiple plug on
PCB incorrectly plugged in, break in cable harness, ignition system
(ignition transformer, ignition cable, ignition plug, ignition electrode)
defective, ionisation flow interrupted (cable, electrode), incorrect earthing
of product, electronics defective
F.29 Failure during operation: Re-ignition unsuccess-
ful
Gas supply temporarily stopped, flue gas recirculation, condensate route
blocked, defective earthing of product, ignition transformer has spark
failure
F.32 Fan fault Plug on fan not correctly plugged in, multiple plug on PCB not correctly
plugged in, break in cable harness, fan blocked, Hall sensor defective,
electronics defective
F.35 Lack of air in combustion unit Fan speed not correct, air supply or smoke outlet blocked, plug not
correctly connected to fan, multiple plug on PCB not correctly connected,
break in cable harness, fan blocked, Hall sensor defective, electronics
defective
F.42 Coding resistor fault (possible in combination
with F.70)
Short circuit/interruption in output range coding resistor (in cable harness
at heat exchanger) or gas group resistor (on PCB)
F.47 Detachment of domestic hot water sensor in
cylinder outlet (flow rate detection)
NTC defective, NTC cable defective, defective plug connection on NTC
F.48 Domestic hot water sensor short circuit at cylin-
der outlet (flow rate detection)
NTC defective, short circuit in cable harness, cable/housing
F.49 Fault: eBUS Short circuit on eBUS, eBUS overload or two power supplies with differ-
ent polarities on the eBUS
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