OVERHEAT error is displayed on the Edel cylinder. What does this mean?

This means the Edel had detected that the hot water is above 85C. This could be a fault with the hot water temperature sensor. 

This will require a service visit to resolve.

The below spare parts will be required-

X-B1244575 (Hot water temp probe 10kOhm 1200mm)
X-B1244096 Main PCB
 This applies to the Edel 170, 200 & 270 cylinders

If the heat pump detects hot water is back to an acceptable temperature, normal operation will continue automatically.

Note: It is impossible to ask for the backup to run if there is an OVERHEAT fault is actively present as the Edel assumes the water is already too hot!

Note if you have your Edel set as a language other than English the error may display as - 

SURC HAUFF (French) 

UEBE RHITZ (German) 

SURR ISCAL (Italian) 

PRZE GRZ (Polish) 

OVE RHITT (Dutch) 

PROT.SOBRE (Spanish) 

PREH RIEV (Slovakian)

PREG REVAN (Slovene) 

PREH RATI  (Czech) 

PREG RIJ (Croatian) 

SOBR.TEMP (Portuguese) 

OVER HET (Norwegian) 

MAGA S HOM  (Hungarian) 

MBIN XEHJE (Albanian) 

PREG REVA  (Serbian) 

Applicable Models:

EDL170-520, EDL170-520RF, EDL200UK-630, EDL200UK-630RF, EDL270UK-630, EDL270UK-630RF