Vaillant ecoTEC plus VC 406/5-5 - C Fault Messages - Overview

Appendix
0020261188_00 ecoTEC plus Installation and maintenance instructions 43
Status code Meaning
S.98 Flow/return sensor test running, heating demands are blocked.
S.108 Purging process is running
C Fault messages – Overview
Message Possible cause Measure
F.00 Flow temperature sensor
interruption
NTC plug loose/not plugged in ▶ Check the NTC plug and plug connection.
NTC sensor defective ▶ Replace the NTC sensor.
Multiple plug loose/not plugged
in
▶ Check the multiple plug and plug connection.
Interruption in the cable harness ▶ Check the cable harness.
F.01 Return temperature sensor
interruption
NTC plug loose/not plugged in ▶ Check the NTC plug and plug connection.
NTC sensor defective ▶ Replace the NTC sensor.
Multiple plug loose/not plugged
in
▶ Check the multiple plug and plug connection.
Interruption in the cable harness ▶ Check the cable harness.
F.03 Cylinder temperature
sensor interruption
NTC sensor defective ▶ Replace the NTC sensor.
NTC plug loose/not plugged in ▶ Check the NTC plug and plug connection.
Connection to cylinder electron-
ics defective
▶ Check the connection to the cylinder electronics.
F.10 Flow temperature sensor
short circuit
NTC sensor defective ▶ Replace the NTC sensor.
Short circuit in the cable har-
ness
▶ Check the cable harness.
F.11 Return temperature sensor
short circuit
NTC sensor defective ▶ Replace the NTC sensor.
Short circuit in the cable har-
ness
▶ Check the cable harness.
F.13 Cylinder temperature
sensor short circuit
NTC sensor defective ▶ Replace the NTC sensor.
Short circuit in the cable har-
ness
▶ Check the cable harness.
F.20 Safety shutdown: Safety
cut-out
Flow NTC defective ▶ Check the flow NTC.
Return NTC defective ▶ Check the return NTC.
Earth connection faulty ▶ Check the earth connection.
Stray spark via the ignition
cable, ignition plug or ignition
electrode
▶ Check the ignition cable, ignition plug and ignition electrode.
F.22 Safety shutdown: Water
deficiency
Insufficient/no water in the
product.
▶ Fill the heating installation. (→ Page 21)
Interruption in the cable harness ▶ Check the cable harness.
F.23 Safety shutdown: Temper-
ature spread too great
Pump blocked ▶ Check that the pump is working correctly.
Pump runs with insufficient out-
put
▶ Check that the pump is working correctly.
Flow and return NTC connected
the wrong way round
▶ Check the connection for the flow and return NTC.
F.24 Safety shutdown: Temper-
ature rise too fast
Pump blocked ▶ Check that the pump is working correctly.
Pump runs with insufficient out-
put
▶ Check that the pump is working correctly.
Non-return valve blocked ▶ Check that the non-return valve is working correctly.
Non-return valve installed incor-
rectly
▶ Check the installation position of the non-return valve.
System pressure too low ▶ Check the system pressure.
F.25 Safety shutdown: Flue gas
temperature too high
Flue gas safety cut-out plug is
not plugged in or is loose
▶ Check the plug and the plug connection.
Interruption in the cable harness ▶ Check the cable harness.
F.27 Safety shutdown: Flame
simulation
Gas solenoid valve not leak-
tight
▶ Check that the gas solenoid valve works correctly.