Glad you found it useful Tom.
Are you able to break out heating and DHW COP?
Obviously the integral issue only relates to space heating.
What curve are you on? What’s your design temp?
Have you tried playing with the curve?
My Arotherm 5kw unit (installed 9/23) has the firmware bug and I’ve obtained a new updated control board from Vaillant, ready to fit.
I’m contemplating doing this swap myself as I have a background and experience which gives me confidence to do it, providing the swap just means the physical removal / refit / re-plug connectors while observing electrostatic protection, etc.
To those who have done the swap (or had it done), are there any other issues / settings to be done, please? Does the warranty need to be updated with Vaillant?
Ultimately, I can wait till next service for a ‘qualified’ person to do it, or am happy to do it myself if it’s a simple 'switch-off / open-up / earth-down / swap / close-up / switch back-on sort of job. Comments welcome!
Finally thanks as always to @Zarch (Mick) for the excellent write-up for the firmware issue.
Andy
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Did they make you buy it?
No, I managed to get it free. I spoke to Vaillant’s UK Product Manager for heat pumps at last year’s Everything Electric show at Farnborough. Armed with @Zarch 's write-up, I asked about the firmware issue (which they knew about) and they offered to have the board replaced by Vaillant service. In trying to subsequently set up a service visit, Vaillant declined to do the visit because I couldn’t answer their questions about easy and unobstructed access to the unit - I was having some building work done. I think they were being unnecessarily ‘picky’ but accepted their offer to send me the board anyway.
Andy
Good. I also got.it replaced FOC (it’s my before/after data in the blog). Others not been as lucky though.
I watched my installer do it. Looked pretty simple.
Switch unit off. top lid off, front cover off.
The board is in a waterproof box at the front.
unplug, plug new one in.
put back in reverse.
If you’re unsure though, i’d get an installer to do it for you.
I specifically asked Vaillant what they needed to know when we swapped the board and they said nothing.
You’ll lose compressor / COP history as that’s stored on the board.
Hey no worries. Glad it helped!! 