Monitoring Legionella Cycle on Ecodan

abbbbbottttt · 16 February 2023 10:16

Hi All,

I’ve just started monitoring my Ecodan setup and am slightly confused by the data when the legionella cycle is running.

I’m not seeing the Tank Temperature go above 50 and there’s no appreciable increase in electricity consumption.

I’m wondering if there’s something wrong with the immersion… Do you guys see spikes when the cycle is running?

Thanks,

Chris

TrystanLea · 16 February 2023 10:34

Hello Chris

Ecodan’s have the immersion heater connected via a second supply. There should be a second mains cable that goes into your indoor controller which is then switched by a relay in the main controller before going to the immersion heater.

Does your monitoring on the Ecodan include that separate supply? Is it even wired in? I’ve seen one installation where the immersion heater was wired in to the main controller but there was no secondary supply connection connected - and so when the relay would switch on/off it wouldn’t do anything…

Note: Immersion heater should be connected independently from one another to dedi-cated power supplies. and the diagram showing this separate supply below:

abbbbbottttt · 16 February 2023 10:57

There’s a separate supply and two fused switches on the wall with two wires coming into the control unit.

Interestingly, they were both switched up (in the traditional off position) when I just checked. I’ve set the cycle to run at 11:00 so will see what happens then.

Do you know why there would be two wires here?

TrystanLea · 16 February 2023 11:26

Im not sure, booster heater, pumps on seperate supplies? any labels?

abbbbbottttt · 16 February 2023 13:27

Unfortunately not… However, I believe I’ve gotten to the bottom of the problem.

It seems the reset button had popped on the immersion heater. Resetting it and I’m now seeing heat and power recordings.

ciachul · 20 January 2024 20:44

I started seeing the same. Legionella cycle is running for 2-3 hours with temp not going above 50. I had to reset heat pump and remove legionella cycle from schedule completely. I guess for some time it is ok, but this option is for a reason so should get this working again sooner or later. When you say your reset button popped what do you mean. Do you mean fuse ? I see fuse is ok. I have attached pictures.