STIEBEL ELTRON LWZ 404 SOL Installation Manual

42 | LWZ304-404 SOL www.stiebel-eltron.com
INSTALLATION
Troubleshooting
No. Fault Appliance response Cause Remedy
03 High pressure switch The high pressure switch has re-
sponded five times in five hours.
The heat pump will shut down.
The external filter on the return is
contaminated.
Clean the filter.
The pump has seized. Ensure its function or replace the pump.
The flow rate through the heat pump
is too low, for example if the ther-
mostatic valves on all the radiators
or the zone valves in the underfloor
heating system are closed.
If you add the flow rate to “Favourites”, you can easily monitor
it. If all valves are closed, this indicates that a heating curve has
been set too high. Match the heating curve in accordance with
the description in chapter “Heating/Heating curve”.
Press the electronics reset button. Notify customer support if
the fault repeats.
04 Low pressure limiter The low pressure switch has re-
sponded five times in five hours.
The heat pump will shut down.
The exhaust air fan is faulty. Fault07
should then also be in the fault list.
Fault in defrost detector. Remove the defrost hose (see chapter "Maintenance and clean-
ing/ Cleaning the evaporator") and check whether it has iced
up. Then push the hose on again to the same length.
Heat pump intake or discharge is
blocked.
Check and clean if required
Press the electronics reset button. Notify customer support if
the fault repeats.
05 Extract air fan The fan speed is not correct. The
fan will be blocked.
The fans are protected by a fuse
against excess current. If one of these
fuses has blown, the fan is blocked
until it has been isolated from the
power supply.
Isolate the appliance across all poles from the mains power for
approx. one minute. If the fan repeatedly fails to start, inform
customer support.
06 Supply air fan The fan speed is not correct. The
fan will be blocked.
The fans are protected by a fuse
against excess current. If one of these
fuses has blown, the fan is blocked
until it has been isolated from the
power supply.
Isolate the appliance across all poles from the mains power for
approx. one minute. If the fan repeatedly fails to start, inform
customer support.
07 Exhaust air fan The fan speed is not correct. The
fan will be blocked. The heat
pump will be blocked.
The fans are protected by a fuse
against excess current. If one of these
fuses has blown, the fan is blocked
until it has been isolated from the
power supply.
Isolate the appliance across all poles from the mains power for
approx. one minute. If the fan repeatedly fails to start, inform
customer support.
This fault may also occur if the power
supply utility shuts down the heat
pump during a power-off period and
parameter "POWER-OFF" has been
set incorrectly.
Ensure that the power-OFF contact has been connected cor-
rectly. Set parameter “POWER-OFF” in accordance with the
specification issued by the power supply utility (see chapter
“Settings/ Contractor level/ Power-OFF”). Press the electron-
ics reset button.
08 Max hot gas The max. hot gas temperature of
120°C was exceeded. The com-
pressor was shut down for safety
reasons.
09 EVE min. The "Min. superheating" limiter
has responded five times in five
hours. The heat pump will shut
down.
Press the electronics reset button. If this faults occurs repeat-
edly, notify customer support.
10 Flow max Call the service department.
11 Low pressure sensor The low pressure sensor does
not deliver a plausible signal
(<2mA longer than 10s).
Cause may be the low pressure sen-
sor fault.
Also check the sensor lead. Notify customer support if the fault
repeats.
12 HP sensor The high pressure sensor does
not deliver a plausible signal
(<2mA longer than 10s). The
heat pump will be blocked in
cooling mode.
Likely cause is the high pressure
sensor fault.
Also check the sensor lead. Notify customer support if the fault
repeats.
13 EVE refrigerant
shortage
The "Refrigerant shortage" lim-
iter has triggered five times in
five hours. The heat pump will
shut down.
Press the electronics reset button. If this faults occurs repeat-
edly, notify customer support.
14 EVE Ex valve will not
close
Call the service department.

STIEBEL ELTRON LWZ 404 SOL Specifications

General

Brand	STIEBEL ELTRON
Model	LWZ 404 SOL
Category	Fan
Language	English