Vaillant ecoTEC plus 418 - Page 103

F.29
Flame goes off during operation and
subsequent
ignition attempts failed Gas supply
temporarily stopped, faulty earthing of
appliance
F.32
Fan speed variation
Fan blocked, plug not inserted correctly
on fan, hall sensor defective, fault in
cable harness, electronics defective
F.49
eBUS under voltage
Short circuit on eBUS, overload on
eBUS or two power sources on eBUS
with different polarity
F.61
Gas–valve control defective
Short circuit/earth (ground) leak in cable
harness to gas valves, gas valve
assembly defective (earth/ground leak
from coils), electronic control system
defective
F.62
Gas valve shut off delay
Gas valve leaking, electronics defective
F.63
EEPROM error
Electronics defective
F.64
Electronics/NTC fault
Short-circuit in flow or return NTC or
electronics defective
F.65
Electronics temperature too high
Electronics too hot due to external
effect, electronics defective
F.67
Flame detector input signal is outside
the limits (0 or 5 V)
Electronics defective
F.70
No valid DSN in display and/or main
board
Spare part failure display and main
board interchanged at same time and
device specific number not adjusted
F.71
Flow NTC reports constant value (stuck
at)
Flow NTC is defective
F.72
Flow and/or return NTC fault
Flow and/or return NTC is defective
(tolerances too big)