Appendix
0020239015_05 ecoTEC plus Installation and maintenance instructions
33
Status code
Meaning
S.54
Waiting period: Low water pressure in the circuit (flow/return spread too large)
S.88
Product purging active
S.91
Maintenance: Demo mode
S.96
Automatic test programme: Return temperature 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
E
Overview of fault codes
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.10
Flow NTC short circuit
NTC defective, short circuit in cable harness, cable/casing
F.11
Return NTC short circuit
NTC defective, short circuit in cable harness, cable/casing
F.13
Warm start sensor/cylinder sensor short circuit
NTC defective, short circuit in cable harness, cable/casing
F.22
Safety switch-off: Low water pressure
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 switch-off: Temperature difference too
great
Pump blocked, insufficient pump output, air in product, flow and return
NTC connected the wrong way round
F.24
Safety switch-off: 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 switch-off: Flue gas temperature too high
Break in plug connection for optional flue gas safety temperature limiter
(STB), break in cable harness
F.27
Safety switch-off: Flame simulation
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 duct blocked, incorrect gas restrictor, incorrect spare part
gas valve, fault on the gas valve, multiple plug on PCB incorrectly
plugged in, break in cable harness, ignition system (ignition transformer,
ignition cable, ignition plug, ignition electrode) defective, ionisation
current 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 duct
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.49
Fault: eBUS
Short circuit on eBUS, eBUS overload or two power supplies with differ-
ent polarities on the eBUS
F.61
Fault: Gas valve regulation
–
Short circuit/short to earth in cable harness for the gas valve
–
Gas valve defective (coils shorted to earth)
–
Electronics defective
F.62
Fault: Gas valve switch-off delay
–
Delayed shutdown of gas valve
–
Delayed extinguishing of flame signal
–
Gas valve leaking
–
Electronics defective
F.63
Fault: EEPROM
Electronics defective
F.64
Fault: Electronics/NTC
Flow or return NTC short circuited, electronics defective
F.65
Fault: Electronics temp.
Electronics overheating due to external influences, electronics defective
F.67
Fault: Electronics/flame
Implausible flame signal, electronics defective
