Siemens DE2427515: A fault, what to do? Fault

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en

A fault, what to do?

If your appliance does not operate as required, it is often due to a very minor problem. Please check whether you can remedy 

the fault yourself by using the following guidelines. You will save yourself the costs of an unnecessary visit by customer service 

personnel.

Fault

Cause

Solution

Who

Water flow-rate is too low.

The filter in either the water tap or 

the showerhead is clogged. 

Remove the filter and either 

clean it or descale it.

Customer

The filter in the corner regulating 

valve is clogged.

Get a servicing expert to clean the 

filter.

Servicing 

expert

The filter upstream from the check 

valve in the cold water supply inlet 

is clogged.

Remove the filter and either 

clean it or descale it.

Servicing 

expert

The desired water temperature is 

set, but it is not reached.

The continuous-flow heater is 

connected to a thermostatically-

controlled water faucet.

Set the temperature on the continu-

ous-flow heater to “60 °C”.

Customer

The display is blank

The fuse in the house electrical in-

stallation has triggered/blown.

Check the fuse in the house electri-

cal installation.

Customer

The appliance's automatic circuit 

breaker has been tripped.

Get the appliance's automatic 

circuit breaker checked by an 

electrician.

Servicing 

expert

The water is not warm.

The fuse in the house electrical in-

stallation has tripped/blown.

Check the fuse in the house electri-

cal installation.

Customer

From time to time, cold water 

flows out.

The air sensor in the appliance de-

tects air in the water and momen-

tarily switches the heating element 

off.

After a few seconds, the continu-

ous-flow heater automatically goes 

back into operation.

Continuous-

flow heater 

automati-

cally resolves 

problem

The set temperature, for instance 

41.0 °C flashes. The temperature 

of the water leaving the tap is 

higher than the set temperature.

The temperature of the water 

supplying the continuous-flow 

heater is higher than the set tem-

perature (e. g. due to pre-warmed 

water supplied from a solar water 

heater).

The thermostatic premixer in the 

domestic supply must be set ac-

cordingly to lower temperatures.

Customer

Winter operation:The desired wa-

ter temperature leaving the tap is 

no longer reached.

The supply temperature has 

reduced.

Reduce the water flow on the taps 

until the desired water temperature 

is reached.

Customer

E02

No thermostatic premixer available 

The supply temperature to the 

continuous-flow heater is higher 

than 55 °C (e. g. due to pre-warmed 

water supplied from a solar water 

heater).

Install a thermostatic premixer in 

the domestic supply. 

Customer

The supply temperature to the 

continuous-flow heater is higher 

than 55 °C (e. g. due to pre-warmed 

water supplied from a solar water 

heater).

The thermostatic premixer in the 

domestic supply must be set ac-

cordingly to lower temperatures.

E03–E04

Temperature sensor defective

Please contact customer service.

Customer 

Service

E05–E07 

Electronic malfunction

Please contact customer service.

Customer 

Service

E08

Frost damage

The water supply sensor measures 

a temperature on ≤ 0 °C.

The appliance is defective! Switch 

off the water supply immediately 

and disconnect the appliance from 

the electrical supply (also refer to 

the safety instructions) 

Please contact customer service.

Customer/

Servicing 

expert