Indicator lamp flashing red
Malfunctions in ICP 10 are usually indicated by the indic-
ator lamp on the voltage converter housing flashing red.
First, reset the voltage converter by unplugging it from
the mains supply, waiting about 30 seconds and then
plugging it in again.
Possible causes if the fault persists.
• No or too little water in the hot water tank.
• Insufficient electrical connection between the mains-
powered voltage converter and anode/water heater.
• Insufficient insulation between the electrode and the
water heater’s wall or mounting components.
• Insufficient insulation of the titanium anode as a result
of a sealing fault.
When the tank is empty the resistance between the
titanium anode and the tank must be high, theoretically
infinite.
• Incorrect polarity in the connection cable. In normal
operation, the anode should be the positive terminal
and the tank should be the negative terminal.
• Cable break in the connection cable.
Measurements
The following measurements are carried out when
troubleshooting. Any deviations from the nominal values
indicate that the system has been incorrectly installed.
TIP
A digital multimeter is required for these
checks.
Measuring the operating voltage
Set the instrument’s measurement range selector to
the range 20 VDC. Connect the instrument’s positive
electrode to the anode and the negative electrode to
the water heater.
Nominal value: At least + 2,3 VDC. Depending on the
conductivity of the water, an operating voltage between
approx. 2,3 and approx. 5 V can be considered normal.
If the water has very low conductivity, the operating
voltage may be higher.
Deviations from nominal values: A higher operating
voltage (up to 10 V) could indicate an uninsulated metal
immersion heater. If the operating voltage is close to
zero, the cathodic corrosion protection does not work.
This can happen if the titanium anode is short circuited
to the water heater, for example as a result of a defect-
ive seal, or if the anode is in contact with components
inside the tank.
Measuring the protective current
Procedure: Set the instrument to the measurement
range 200 or 20 mA and connect it in series between
the mains-powered voltage converter and the tank, or
between the
mains-powered voltage converter and the anode.
Nominal value: With normal enamel, and if there are no
other components, values lower than 10 mA are normal
for normal drinking water quality. The real value is also
affected by the size of the tank.
Deviations from nominal values: High currents, particu-
larly 10 mA or higher, may indicate extensive enamel
damage or that non-enamelled components with insuf-
ficient insulation are short circuited. If the protective
current is zero, the cathodic corrosion protection does
not work.
Check the connection cable and connectors.
Polarity check
Procedure: Connect the instrument’s positive electrode
to the anode and the negative electrode to the water
heater.
Nominal value: Operating voltage 2,3 VDC. The instru-
ment must indicate positive voltage.
Deviations from nominal value: If the value has the
wrong sign (for example -2,5 V), the polarity is wrong,
which increases the risk of water heater corrosion.
Switch off ICP 10 immediately and contact your installer.
Checking the insulation
a) Titanium anode
Procedure: Set the instrument to resistance measure-
ment. Drain the water heater, so that the water does
not cause electrical conduction. Connect the instru-
ment’s electrodes to the titanium anode and the
enamelled water heater.
Read off the resistance.
Nominal value: High resistance (1 kΩ or more).
Deviations from nominal value: The resistance of a short-
circuited titanium anode is close to zero.
ICP 10 | GB
16
