Appendix; A Troubleshooting - Vaillant electronicVED lite Operating Instructions Manual

Appendix

A Troubleshooting
Diagnostics in accordance
with the LED display
No LED lights up
The green LED flashes
The green and yellow LEDs
flash (not in every case)
The green LED flashes and
the yellow LED lights up
permanently
The green LED flashes and
the red LED flashes quickly
The green LED flashes and
the red LED lights up per-
manently
46
Fault Possible cause
No domestic hot water The fuse has tripped.
generation
The PCB is defective
Product does not start The shower head and/or aerator for
the water tap are calcified
The domestic hot water The product's filter is dirty
flow rate quantity is too
low
No domestic hot water, The volume flow sensor is defective
while the flow rate quant-
ity is greater than the ini-
tial flow rate
The set temperature is The product has reached its power
not reached limit
One of the product's phases is de-
fective
The set temperature is The target valuator or the connection
not reached cable is defective. The connection
cable is not connected.
The scald protection is activated
The outlet sensor is defective
No domestic hot water, The heating system is defective
while the flow rate quant-
ity is greater than the ini-
tial flow rate
The PCB is defective
No domestic hot water The product is calcified
generation
No domestic hot water The safety pressure switch has been
generation triggered.
Electronics safety fault
The inlet sensor or the connection
cable is defective.
Short circuit in the outlet sensor or
connection cable.
The PCB is defective
The desired temperature The cold water input temperature is
of > 55 °C is not main- above 55 °C
tained
The product switches The air detection registers air
itself off
The domestic hot water generation is
temporarily switched off
Troubleshooting
Check the circuit breaker (fuse) and,
if required, switch it on.
Replace the product
Descale the shower head and/or
aerator for the water tap, or replace
it
Clean the filter
Replace the product
Reduce the flow rate quantity, install
a flow rate limiter, check the flow
rate limiter
Check the circuit breaker (fuse) and,
if required, switch it on.
Connect the connection cable; if
required, replace the valuator.
Deactivate the scald protection
Ensure that the outlet sensor is con-
nected; if required, replace the outlet
sensor.
Check the resistance of the heating
system and, if required, replace the
product.
Replace the product
Replace the product
Open a draw-off valve downstream
of the product for one minute in or-
der to allow the heating system to
cool. Activate the safety pressure
switch by pressing the safety switch
(→ Page 42)
Replace the product
Check the cable connection and, if
required, replace the inlet sensor
Check the connection and, if re-
quired, replace the outlet sensor
Replace the product
Reduce the product's inlet temperat-
ure
The product restarts after one minute
Installation and maintenance instructions 0020323586_00