Article reference KA-01786
Follow the extract of the manual below to switch on the back up electric element (Elec Mode) for the hot water. This should provide some hot water until a service engineer can look at the cylinder.

Note if you have your Edel set as a language other than English the error may display as -
APPT.ELEC (French)
ZUSH.ELEKT (German)
INT.RESIS (Italian)
GRZA LKA E (Polish)
ELEC.BACKU (Dutch)
APY O_ELEC(Spanish)
EL Z AL_ZD (Slovakian)
EL_G RELEC (Slovene)
EL Z AL_ZD (Czech)
ELEK.GRIJ (Croatian)
APOI ELET (Portuguese)
EL TILSK (Norwegian)
ELEK.UTANF (Hungarian)
MOD.ELEKT (Albanian)
ELEK.GREJ (Serbian)
Applicable Models
Edel – EDL170-520RF, EDL200UK-630RF, EDL270UK-630RF, EDL200UK-630, EDL270UK-630