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ENGLISH
www.stiebel-eltron.com WWK222-302 H | 17
INSTALLATION
Troubleshooting
13. Troubleshooting
WARNING Electrocution
Troubleshooting work must only be carried out by a
qualified contractor. 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
Following an interruption of the power supply, compres-
sor operation remains blocked for at least one minute
while the appliance initialises.
If the compressor subsequently fails to start, it may be
blocked by additional safety devices (motor overload
relay, high pressure switch). This block can last between
1 and 10minutes.
Fault Cause
Remedy
No hot water is
available.
The impressed current
anode is faulty.
Replace the impressed current
anode.
The compressor
switches off un-
expectedly.
The application limits
have been exceeded or
undershot.
No action required.
Excessive pressure in the
refrigerant circuit. The
safety pressure limiter
has responded 5 times in
5 hours. The compressor
has been switched off.
Eliminate the cause of the
increase in pressure in the
refrigerant circuit. Wait ap-
prox.5-15minutes for the appli-
ance to equalise the pressure.
The appliance can only be un-
blocked using a service program-
ming unit.
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 evap-
orator is contaminated. Ensure
that the supply and extract air
flow are unimpeded.
13.1 Resetting the safety pressure limiter
The safety pressure limiter responds if the pressure in the re-
frigerant circuit exceeds the permissible maximum value. If the
safety pressure limiter responds 5 times in 5hours, compressor
operation is blocked.
Eliminate the cause of the increase in pressure in the refrig-
erant circuit
Wait approx.5-15minutes for the appliance to equalise the
pressure.
The appliance can only be unblocked using a service program-
ming unit.
13.2 WWK222H/ WWK 302H: Resetting the high
limit safety cut-out
If the DHW cylinder is overheated, the high limit safety cut-out
switches off the electric emergency/booster heater to protect the
appliance.
D0000039352
1
1 Reset button for high limit safety cut-out
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.
13.3 Motor overload relay
The motor overload relay will shut down the compressor in the
case of excessive thermal load.
Remove the cause.
After a short cooling period, the motor overload relay will restart
the compressor automatically.
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