Vaillant ECOTEC EXCLUSIVE 627 VU 256/5-7 Installation And Maintenance Instructions Manual - page 43
Appendix
0020193966_01 ecoTEC exclusive Installation and maintenance instructions
43
Status code
Parameter
Meaning
S.98
Flow/return temperature sensor self-test
Flow/return sensor test running, heating demands are
blocked.
S.99
Vaillant self-test
Self-test
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.
Code
Parameter
Possible causes
F.00
Interruption: Flow sensor
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
Interruption: Return sensor
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: DHW outlet sensor
Only in conjunction with F.91
NTC defective, NTC cable defective, defective plug connection on NTC,
defective plug connection on the actoSTOR electronics
F.03
Interruption: Cylinder sensor
Only in conjunction with F.91
NTC defective, NTC cable defective, defective plug connection on NTC,
defective plug connection on the actoSTOR electronics
F.10
Short circuit: Flow sensor
NTC defective, short circuit in cable harness, cable/housing
F.11
Short circuit: Return sensor
NTC defective, short circuit in cable harness, cable/housing
F.12
Short circuit: DHW outlet sensor
Only in conjunction with F.91
NTC defective, short circuit in cable harness, cable/housing
F.13
Short circuit: Cylinder sensor
Combination product: Warm start sensor/cylinder sensor short circuit
Combination product with actoSTOR: Short circuit cylinder sensor (NTC)
only in combination with F.91
NTC defective, short circuit in cable harness, cable/housing
F.20
Safety switch-off: Temperature limiter
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 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: Temp.spread too large
Pump blocked, insufficient pump output, air in product, flow and return
NTC connected the wrong way round
F.24
Safety switch-off: Temp. incr. 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 temp. too high
Break in plug connection for optional flue gas safety cut-out (SCO),
break in cable harness
F.26
Fault: Fuel valve not working
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 switch-off: Flame simulation
Moisture on the electronics, electronics (flame monitor) defective, gas
solenoid valve leaking
F.28
Start-up failure: Ignit. unsuccessful
Gas meter defective or gas flow monitor has triggered, air in gas, gas
flow pressure too low, thermal isolator device (TAE) has triggered, con-
densate route blocked, incorrect gas injector, incorrect spare part gas
valve assembly, value in D.052 does not correspond to the printed value
on the current gas valve assembly, fault on the gas valve assembly, mul-
tiple plug on PCB incorrectly plugged in, break in cable harness, ignition
system (ignition transformer, ignition cable, ignition plug, ignition elec-
trode) defective, ionisation flow interrupted (cable, electrode), incorrect
earthing of product, electronics defective
F.29
Start-up failure: Ignit. unsuccessful
Gas supply temporarily stopped, flue gas recirculation, condensate route
blocked, defective earthing of product, ignition transformer has spark
failure
F.32
Fault: Fan
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