Maintenance; Draining The Appliance; Checking / Replacing The Sacrificial Anode; Descaling - Stiebel Eltron PSH 20 Plus Installation Et Fonctionnement

INSTALLATION

Maintenance

Fault Cause
The water does not heat The high limit safety
up and the ON/OFF indi- cut-out has responded
cator does not illuminate. because the controller is
faulty.
The high limit safety
cut-out has responded
because the temperature
has fallen below 5°F
(-15°C).
The water does not heat The heating element is
up and the ON/OFF indi- faulty.
cator illuminates.
The water does not heat The temperature control-
up sufficiently and the ler is faulty.
ON/OFF indicator illumi-
nates.
The heat-up time is very The heating element is
long and the ON/OFF in- scaled up.
dicator illuminates.
The T&P relief valve drips The valve seat is contam-
when heating is switched inated.
off.
Water pressure is too
high.
An expansion vessel was
not installed.
Reset key, high limit safety cut-out
If the high limit safety cut-out has activated, it should be reset.
Shut off the circuit breaker connected to the appliance before
removing the bottom cover and resetting the switch.
15. Maintenance
WARNING Electrocution
Carry out all electrical connection and installation work
in accordance with relevant regulations.
Before any work on the appliance, disconnect all poles
of the appliance from the power supply.
If you need to drain the appliance, observe chapter 15.1, "Draining
the appliance", pg. 10.
10 | PSH Plus

15.1 Draining the appliance

Remedy
Remedy the cause of the
fault. Replace the con-
troller.
Press the reset button
(see diagram).
If is necessary to drain the cylinder for maintenance or to protect
the whole installation from freezing, proceed as follows:
f Close the shut-off valve in the cold water feed line. f
Replace the heating el-
f Open the DHW valves of all draw-off points until the appli- f
ement.
Replace the temperature
f Drain any residual water from the T&P relief valve. f
controller.

15.2 Checking / replacing the sacrificial anode

Descale the heating el-
f Check the sacrificial anode after the first year of use and re- f
ement.
f Next, decide the time intervals at which further checks f
Clean the valve seat.
Install a pressure reduc-
ing valve.

15.3 Descaling

Install an expansion
f Remove loose scale deposits from the water heater. f
vessel in line with the
appliance (see plumbing
f If necessary, descale the inner cylinder with commercially f
schematic).
f Only descale the flange after disassembly and never treat the f

15.4 Anti-corrosion protection

Ensure that while carrying out maintenance work the anti-cor-
rosion protection resistor (560 Ω) is not damaged or removed.
Reinsert the anti-corrosion protection correctly after replacement.

15.5 Replacing the power cable

WARNING Burns
Hot water may escape during the draining process.
ance is fully drained.
place if necessary.
should be carried out.
available descaling agents.
cylinder surface and sacrificial anode with descaling agents.
DANGER Electrocution
The power cable must only be replaced (for example if
damaged) by a qualified technician.
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