Troubleshooting
Installation and maintenance instructions ecoTEC plus 0020134833_01
71
13
13.2.8
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.02
Interruption cylinder charging sensor actoSTOR
(NTC) only in combination with F.91
NTC defective, NTC cable defective, defective plug connection on NTC,
defective plug connection on actoSTOR electronics
F.03
Interruption cylinder sensor actoSTOR (NTC)
only in combination with F.91
NTC defective, NTC cable defective, defective plug connection on NTC,
defective plug connection on actoSTOR electronics
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.12
Short circuit at cylinder charging sensor (NTC)
only in combination with F.91
NTC defective, short circuit in cable harness, cable/casing
F.13
Short circuit cylinder sensor (NTC) only in combina-
tion with F.91
NTC defective, short circuit in cable harness, cable/casing
F.20
Safety switch-off: Temperature limiter
Incorrect earth connection between cable harness and boiler, flow or
return NTC defective (loose connection), black discharge via ignition
cable, ignition plug or ignition electrode
F.22
Safety switch-off: Low water pressure
No water pressure, or water pressure is too low in the boiler, water pres-
sure 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 boiler, flow and return
NTC interchanged
F.24
Safety switch-off: Temperature rise too fast
Pump blocked, poor pump performance, air in boiler, system pressure
too low, non-return valve blocks/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.26
Fault: Gas valve without function
Gas valve stepper motor not connected, multiple plug on the PCB not
plugged in correctly, interruption in cable harness, gas valve stepper
motor defective, electronics defective
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 cur-
rent interrupted (cable, electrode), incorrect earthing of boiler, electron-
ics defective
F.29
Failure during operation: Re-ignition unsuccessful
Gas supply temporarily stopped, flue gas recirculation, condensate duct
blocked, faulty earthing of boiler, 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
Air/flue gas duct fault
Air/flue gas duct blocked
F.42
Coding resistor fault (possible in combination with
F.70)
Short circuit/interruption in coding resistor output range (in cable har-
ness at heat exchanger) or gas group resistor (on PCB)
13.2 Fault codes
Summary of Contents for ecoTEC plus VUI
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