ERR. 08 error is displayed on the Edel cylinder. What does this mean?

This means the Edel had detected an issue with the evaporator sensor

An engineer’s visit will be needed to establish root cause & repair.

Take following parts (applies to all sizes):
X-B4993072 (Evap temp probe 10kOhm 900mm)
X-B1244096 Main PCB
  

When ERR08 is encountered the heat pump should automatically enable the backup immersion element.

Require additional help? Please follow link below

https://glendimplexservice.freshdesk.com/a/solutions/articles/79000136321

Applicable Models:

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