P.14
P.15
If the connection cable is damaged, it must be replaced with an original spare cable from the manufacturer by
an authorised technician in order to avoid any hazards.
If you cannot rectify the fault with the aid of the troubleshooting table, please contact the customer service.
The following table will help you to determine and rectify the reasons for possible problems.
5. Troubleshooting
Problem
Possible cause
Remedy
No water flows
Water supply is turned off
Open the main water valve and angle valve
Water flows more slowly
than expected
Water pressure too low
Check the water flow pressure
Dirt in the pipes
Remove any dirt from the filter, angle valve
and tap
The appliance switches
itself on and off
Water pressure fluctuates,
flow rate is too low
Remove any dirt / increase the water flow
pressure, close other taps, open angle
valve further
Water remains cold even
though the appliance
switches on
Electric supply incorrect
Check the electric supply
No voltage
Check fuses in the electrical installation
Faulty heating element
Replace heating element (by authorised
technician)
Appliance does not
switch on and the water
remains cold
Water connections mixed up
Check installation
Water flow pressure too low
Check water flow setting (by authorised
technician), open angle valve further,
check water pressure
Dirt in the pipes
Remove dirt from the inlet and outlet pipes
Hot water temperature
varies
Water pressure fluctuates
Stabilise the water flow pressure
Supply voltage varies
Check the supply voltage
Hot water temperature is
too low
Flow rate is too high or inlet tem-
perature is too low
Adjust the water flow (by authorised
technician)
Power supply is too low
Check the power supply
GPI-M6:A faulty heating element
Replace heating element (by authorised
technician)
4.4 Purging
Each time it is emptied (for example after work on the plumbing system or following repair work on the
appliance), the instantaneous electric water heater must be purged before it is used again.
1. Switch off the power supply to the instantaneous electric water heater.
2. To purge the instantaneous electric water heater, open the hot water tap and wait until the water
emerges free of air bubbles.
3. Switch the power supply back on again.
4.5 Cleaning and maintenance
- Plastic surfaces and fittings should only be wiped with a damp cloth. Do not use abrasive or chlorine-
based cleaning agents or solvents.
- For a good water supply, the outlet fittings (special tap aerators) should be unscrewed and cleaned at
regular intervals. Every three years, the electrical and plumbing components should be inspected by an
authorised professional in order to ensure proper functioning and operational safety at all times.
4.3 Changing the strainer
The cold water connection of the instantaneous electric water heater is equipped with a strainer. Dirt depos-
ited in this strainer can reduce the hot water output. Clean or replace as follows.
1. Switch off the power supply to the instantaneous electric water heater.
2. Close the shut-off valve in the inlet pipe.
3. Disconnect the water pipe from the water inlet. The water inlet is indicated in blue on the rating plate
(under the cover). This can cause water leakage.
4. Lever the strainer out of the connection piece of the
instantaneous electric water heater and clean or
replace it.
5. Insert the clean strainer into the connection piece
and connect the water pipe to the water inlet of the
instantaneous electric water heater.
6. Purge the instantaneous electric water heater as
described in the chapter “Purging”.
7. Switch the power supply back on again.
4. Use
