Thermex ERD 100 V (pro) - Инструкция по эксплуатации - Страница 23

To carry out maintenance and replace the magnesium anode, one shall perform the following 
steps:

џ

Power off the EWH;

џ

Allow hot water to cool down or use it through a mixer;

џ

Block the flow of cold water into the EWH;

џ

Unscrew the relief valve or open the drain valve;

џ

Put the rubber hose on the cold water inlet pipe or on the drain valve by directing its second end into 
the sewage system;

џ

Open the hot water faucet on the mixer;

џ

Drain the water from the EWH through the cold water inlet or drain valve;

џ

Remove  the  protective  cover,  disconnect  the  wires,  unscrew  and  remove  the  removable  flange 
from the casing; 

clean  the  protective  envelope  of  the  heaterelement's

џ

Replace  the  magnesium  anode, 

  from  the 

scale, if necessary, and remove the sediment; 

џ

Perform the assembly, fill the EWH with water and switch on power supply.

When  carrying  out  the  EWH  maintenance  using  the  resources  of  a  specialized  organization,  a 
corresponding mark shall be made in the warranty certificate with the stamp of the organization that 
carried  out  the  maintenance.  When  the  magnesium  anode  is  replaced  by  the  customer,  a  sales 
receipt for the purchase of the magnesium anode shall be attached to this EWH manual.

Possible malfunctions and remedies

In case of malfunction in the product operation, it is necessary to disconnect it from the power supply 
network and shut off the water supply.

Failure

The pressure of hot 
water from the EWH 
has decreased. Cold 
water pressure has 
not changed

Remedy

Remove the valve and rinse it 
with water

Possible Reason

Clogging of the relief valve 
inlet opening

Heating time has 
increased

Protective envelope

 is 

covered with scale crust

Remove the 

Protective envelope

and descale it

The voltage in the power 
supply network has decreased

Contact the organization 
responsible for the maintenance 
of the power supply network

The valve 

24

 (

Fig.1

) is not 

closed or failed

Close or replace the valve 

24

 (

Fig.1

)

EWH works, but does 
not heat water

EN

Frequent triggering 
of the thermal switch

The set temperature is close 
to the temperature limit

Turn the thermostat knob toward 
temperature decrease (

–

)

The thermostat tube 
is covered with scale

Remove the removable flange 
from the EWH and carefully 
clean the pipe from scale

There is no voltage in the 
power supply network

Contact the organization 
responsible for the maintenance 
of the power supply network

The residual current device 
was triggered

Press the reset button of the 
residual current device. 
Check the voltage

.

The powered EWH 
does not heat water. 
There is no backlight 
of control lamps

.

Contact the service center

The mains cable is damaged

Disconnect the EWH from the 
power supply network, remove 
the protective cover, press the 
thermal switch button until it is 
secure, install the cover and 
switch on the power supply (

Fig. 3

)

The thermoswitch was 
triggered or is not switched on

The  abovementioned  malfunctions  are  not  defects  of  the  EWH  and  shall  be  eliminated  by  the 
customer themselves or by a specialized organization at the customer's expense.

Where impossible to eliminate the malfunction using the above recommendations or in case of any 
other problems, contact the service center specified in the user manual.

Fig

. 

3

Push

EN

22

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