20 | WWK 220-300 electronic www.stiebel-eltron.com
INSTALLATION
Troubleshooting
13. Troubleshooting
WARNING Electrocution
Prior to all work on the appliance, isolate it from the
power supply.
!
Material losses
If you disconnect the appliance from the power supply, it
is no longer protected against frost or corrosion.
Only disconnect the appliance from the power sup-
ply for longer periods if you are also draining the
DHW cylinder.
For work inside the appliance, remove the appliance cover
(see chapter "Cleaning and maintenance/ Removing the ap-
pliance cover").
If necessary, remove the upper section of the casing jacket
(see chapter "Maintenance and cleaning/ Removing the cas-
ing ring").
Note
Refit the casing ring after completing the work. See chap-
ter "Maintenance and cleaning/ Fitting the casing ring".
Note
Refit the appliance cover after completing your work. See
chapter "Maintenance and cleaning/ Fitting the appliance
cover").
13.1 Fault table
Fault Cause Remedy
The appliance
switches off
unexpectedly
and does not
switch on
again.
Excessive pressure in
the refrigerant circuit.
The safety pressure lim-
iter has responded. The
compressor has been
switched off.
Eliminate the cause of the in-
crease in pressure in the refriger-
ant circuit.
Wait approx.5 to 15minutes for
the appliance to equalise the
pressure. Reset the safety pres-
sure limiter (see chapter "Trou-
bleshooting/ Resetting the safety
pressure limiter").
The appliance is operated
outside the application
limits. The ambient tem-
perature is higher than
the permissible value.
The safety pressure limit-
er has responded.
Ensure that the application limits
are observed.
Wait approx.5 to 15minutes for
the appliance to equalise the
pressure. Reset the safety pres-
sure limiter (see chapter "Trou-
bleshooting/ Resetting the safety
pressure limiter").
The compres-
sor switches off
unexpectedly.
The thermal load of the
compressor has been ex-
ceeded. The motor over-
load relay has responded.
Remedy the cause of the high
thermal load. Wait until the appli-
ance restarts.
The heating
output of the
appliance has
reduced.
An inadequate air flow
across the evaporator is a
possible cause.
Check whether the fan is contam-
inated. Check whether the evapo-
rator is contaminated. Ensure that
the supply and extract air flow are
unimpeded.
For explanations of the fault codes, see chapter "Troubleshooting".
13.2 Resetting the safety pressure limiter
The safety pressure limiter shuts down the compressor if the
pressure inside the refrigerant circuit exceeds the permissible
maximum value. The safety pressure limiter may also respond if
the appliance is operated above its permissible application limit
or the temperature controller of the heat pump fails to respond.
D0000034801
1
2
1 Reset button for safety pressure limiter
2 Reset button for high limit safety cut-out
After removing the cause of the fault, reset the safety pres-
sure limiter by pressing the reset button.
13.3 Resetting the high limit safety cut-out
The high limit safety cut-out protects the appliance from overheat-
ing. The electric emergency/booster heater is switched off when
the cylinder water temperature exceeds 87±5 °C.
Once the cause of the fault has been removed, press the reset
button of the high limit safety cut-out on the rod thermostat. To
do so, remove the appliance cover.
13.4 Motor overload relay
In the event of excessive thermal load on the compressor, the
motor overload relay switches the compressor off.
Remove the cause.
After a short cooling period, the motor overload relay will restart
the compressor automatically.
314104-38523-9034_WWK_220-300_electronic_en_pl.indb 20 24.02.2015 10:33:47
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