Vaillant ecoTEC plus VUI Series, Installation And Maintenance Instructions Manual

Page: 79 / 100

0020308121_04 Installation and maintenance instructions
79
Code/meaning Possible cause Measure
F.064
The sensor signal could not be
converted correctly.
Sensor defective
▶
Check the sensor displayed under D.166 .
PCB defective
▶
If the displayed value for D.166 is > 20 and is not listed, re-
place the PCB.
F.065
The permissible operating tem-
perature range for an electronic
component has been exceeded.
Electronics overheated
▶
Check the external heat effects on the electronics.
PCB defective
▶
Replace the PCB.
F.067
The flame monitor is defective.
Implausible flame signal
▶
Check the flame signal.
PCB defective
▶
Replace the PCB.
F.068
The flame monitor reports an
unstable signal.
PCB defective
▶
Replace the PCB.
F.070
The Device Specific Number
(DSN) is incorrect, missing or
does not match the coding res-
istor.
Device Specific Number not set
correctly following simultaneous
replacement of the PCB and
display 1. Set the correct Device Specific Number.
2. Following simultaneous replacement of the PCB and
display, replace the control electrode.
Fault in the electrical connection
for the gas valve assembly
▶
Check the wiring harness between the PCB and gas valve
assembly, including all plug connections.
F.071
Flow temperature sensor re-
turns implausible values.
Flow temperature sensor in the
incorrect position
▶
Check the positioning of the flow temperature sensor.
Flow temperature sensor de-
fective
▶
Check and, if required, replace the flow temperature sensor.
F.072
The temperature spread
between the flow and return
temperature sensor is invalid.
Flow temperature sensor de-
fective
▶
Check and, if required, replace the flow temperature sensor.
Fault in the electrical connection
for the flow temperature sensor
▶
Check and, if required, replace the wiring harness between the
PCB and sensor, including all plug connections.
Return temperature sensor de-
fective
▶
Check and, if required, replace the return temperature sensor.
Fault in the electrical connec-
tion for the return temperature
sensor
▶
Check and, if required, replace the wiring harness between the
PCB and sensor, including all plug connections.
F.074
The signal for the water pres-
sure sensor has been interrup-
ted.
Fault in the electrical connection
for the water pressure sensor
▶
Check the wiring harness including all plug connections and, if
required, replace it.
Water pressure sensor defect-
ive
▶
Check and, if required, replace the water pressure sensor.
F.075
The pressure change is too
low when the heating pump is
started up.
Water pressure sensor defect-
ive
▶
Check and, if required, replace the water pressure sensor.
Internal heating pump defective
▶
Replace the internal heating pump.
System pressure too low
▶
Check the system pressure.
Internal expansion vessel de-
fective
▶
Check the internal expansion vessel and replace it, if neces-
sary.
Insufficient/no water in the
product. 1. Fill the heating installation.
2. Check the product and the system for leakages.
Air in the product
▶
Purge the heating installation.
Open circuit in wiring harness
(LIN cable)
▶
Check the wiring harness (LIN cable).
Interruption in the wiring har-
ness
▶
Check the wiring harness including all plug connections and, if
required, replace it.
F.076
The overheating protection for
the primary heat exchanger is
active.
Interruption in the wiring har-
ness
▶
Check the wiring harness including all plug connections and, if
required, replace it (PCB plug X20, contact 3/14).
F.077
A condensate pump or an ex-
ternal flue non-return flap is
blocking the burner operation.
No feedback from the flue non-
return flap or the feedback is
incorrect
▶
Check that the flue non-return flap functions correctly.
Flue non-return flap defective
▶
Replace the flue non-return flap.
Fault in the electrical connection
to the condensate pump
▶
Check the electrical connection to the condensate pump.
Condensate pump defective
▶
Replace the condensate pump.
F.078
The control centre is not sup-
ported by the unit.
Incorrect control module con-
nected
▶
Check whether the control module is compatible with the
product.