D Overview Of Fault Codes - Vaillant ecoTEC plus Installation And Maintenance Instructions Manual

Status code Meaning
S.97 Water pressure sensor test running, heating
demands are blocked.
S.98 Flow/return sensor test running, heating de-
mands are blocked.
D Overview of fault codes
Code Meaning
F.00 Flow temperature sensor interruption
F.01 Return temperature sensor interruption
F.02 Interruption cylinder charging sensor
actoSTOR (NTC) only in combination with
F.91
F.03 Interruption cylinder sensor actoSTOR
(NTC) only in combination with F.91
F.10 Flow NTC short circuit
F.11 Return NTC short circuit
F.12 Short circuit at cylinder charging sensor
(NTC) only in combination with F.91
F.13 Product with integrated hot water
generation: Short circuit warm start
sensor/cylinder sensor
Product with integrated hot water genera-
tion and actoSTOR: Short circuit cylinder
sensor (NTC) only in combination with F.91
F.20 Safety switch-off: Temperature limiter
F.22 Safety switch-off: Low water pressure
F.23 Safety switch-off: Temperature difference
too great
F.24 Safety switch-off: Temperature rise too fast
F.25 Safety switch-off: Flue gas temperature too
high
F.26 Fault: Gas valve without function
F.27 Safety switch-off: Flame simulation
F.28 Failure during start-up: Ignition unsuccess-
ful
F.29 Failure during operation: Re-ignition unsuc-
cessful
F.32 Fan fault
F.42 Coding resistance fault (possible in combin-
ation with F.70)
0020209591_01 ecoTEC plus Installation and maintenance instructions
Cause
NTC plug not plugged in or has come loose, multiple plug on the PCB
not plugged in correctly, interruption in cable harness, NTC defective
NTC plug not plugged in or has come loose, multiple plug on the PCB
not plugged in correctly, interruption in cable harness, NTC defective
NTC defective, NTC cable defective, defective plug connection on NTC,
defective plug connection on actoSTOR electronics
NTC defective, NTC cable defective, defective plug connection on NTC,
defective plug connection on actoSTOR electronics
NTC defective, short circuit in cable harness, cable/casing
NTC defective, short circuit in cable harness, cable/casing
NTC defective, short circuit in cable harness, cable/casing
NTC defective, short circuit in cable harness, cable/casing
Incorrect earth connection between cable harness and product, flow or
return NTC defective (loose connection), black discharge via ignition
cable, ignition plug or ignition electrode
No or insufficient water in the product, water pressure sensor defective,
cable to pump or water pressure sensor loose/not connected/defective
Pump blocked, insufficient pump output, air in product, flow and return
NTC connected the wrong way round
Pump blocked, insufficient pump output, air in product, system pressure
too low, non-return valve blocked/incorrectly installed
Break in plug connection for optional flue gas safety temperature limiter
(STB), break in cable harness
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
Moisture on the electronics, electronics (flame monitor) defective, gas
solenoid valve leaking
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
Gas supply temporarily stopped, flue gas recirculation, condensate duct
blocked, defective earthing of product, ignition transformer has spark
failure
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
Short circuit/interruption in output range coding resistance (in cable
harness at heat exchanger) or gas group resistor (on PCB)
Appendix
47