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Last seen: Jun 2, 2026
As @jamespa says, there is some sort of limitation, or rather imbalance. The difference between the set flow temp and actual flow temp isn't trivial, ...
Which means the actual flow temp will be less than the set flow temp, and it is was probably also the case in the previous image. You need to catch it...
Does that image show a target flow temp of 49°, and a current flow temp of 33°C (the images are rather blurred). If so, and it is not in the deep trou...
I think just a few readings would be useful. Try to pick a time when the OAT is low, and do the same again when it is higher, and you have two points ...
I think that is an important step, to narrow down where the problem lies, even if you need to do it manually. PS didn't mean to rattle off a lot of ...
There are still things that don't stack up in this chart (reproduced to avoid the need for page hopping): Why does the power dro...
Some observations: 1. I for one don't know the Vaillant jargon and that makes it difficult to comment, or even understand what the problem is. I thi...
Yes, but that is in cold weather. If you look at my chart, you will see that I was using around 4kW in the middle of the night (ouch!), but middle of ...
A different heat pump (Midea 14kW) but a stark reminder of what a difference a change in OAT makes to the trailing 60 minute COP (blue line in lower c...
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