STIEBEL ELTRON electronic comfort SHZ 30 LCD Operating And Installation Instructions page 22

7. Fault rectification
Code enquiry
LCD display Button Note
Fault / defect code / Info
No display in the control panel.
Ca-scale symbol shows
Service symbol.
Code Continuous display -
setpoint temperature.
Code
Code No anode protection.
Code Last preset setpoint values
active. Possibly continuous
display of
Defect symbol >> flashing.
Code Continuous display -
setpoint temperature.
Code No heating-up symbol.
Code Running dry protection.
Code
22 22 22
by the qualified installer
Menu selection.
Code enquiry for service.
Possible cause / defect
No voltage.
No connection to the control unit.
Control unit defective.
Heating element scaled. Heating continues.
Water heating continues.
Maintenance requirement.
Temperature sensor fault.
Parasitic current anode fault.
Communication fault with electronic
„regulator" and „control unit" modules.
.
No water heating.
Temperature sensor defective.
Safety thermal cut-out (STB) actuated.
Heating element defective.
No water in the reservoir.
No anode current.
Relay defective.
Rectification
Restore voltage supply.
Check that connector „X2" is correctly
H
fitted .
Check control unit (21) and if necessary
replace.
Descale element. Symbol will disappear.
Service code enquiry.
Service / maintenance required.
Check that connector „X10" is correctly
L
fitted . Inspect temperature sensor.
Check that connector „X7" is correctly
L
fitted . Check parasitic current anode and
wiring.
Check that connector „X2" is correctly
H
fitted on both modules .
Check connection cable and modules.
Defect code enquiry.
Corrective maintenance urgently
required!
Check that connector „X10" is correctly
L
fitted . Inspect temperature sensor.
Eliminate error and reset thermal cut out.
Rectify cause and unlock; inspect STB and if
necessary replace.
Fill the reservoir with water.
Check that connector „X7" is correctly
L
fitted . Inspect parasitic current anode
and wiring.
Replace regulator electronic module ( 23 ).