you get get more data via service codes, for example:
003 // compressor starts
004 // discharge temp
005 // th3
007 // th6
012 // superheat
013 // subcool
019 // fanspeed
No its not released yet for his firmware, its in beta at the moment. Just wait for it. TH3 for me is a good indicator for next defrost
It’s been exposed into HA below, few of us were testing/monitoring ahead of formal release (imminently) to understand variation between FTC and ensure performance isn’t impacted by the slow request/received times of these requests
Thanks. Have installed this now. Both TH3 and TH6 are reading 0 at the moment. Will see how it goes.
@gekkekoe Is there anything I should watch for in there?
@Timbones Thanks for the review. My installer is coming out tomorrow to check another couple issues (around wiring and a small leak) so I’ll see if I can mention it to him. He might know something.
Monitor TH3, defrost and outside temp, and see if there’s a relation between them for your install
You might get some insight why its defrosting. Also I remember the ecodan needs a certain min return temperature to do the defrost, but yours are pretty high, so that’s not the problem.
Ah its updated now.
TH6 sitting at 6 and TH3 at 11.
I have no idea what these mean but can watch them.
plot defrost, TH3 and outside temp, for me delta around 10k triggers a defrost, you can see that TH3 will gradually go down when more ice is forming. Try to understand why. Monitor TH3 before and after defrost, is it still low?
so TH3 before defrost was around 10c, but then drops to around 1c. Probably resolution is not high enough. When defrost is finished, whats the TH3 afterwards? It seems colder than before it started, so maybe defrost did not worked well enough. Can you plot TH6 as well? That’s the water temp flowing in when defrosting.
For example, this was my last defrost today:
You can see that TH3 eventually is becoming -1c again. During startup after a defrost, my heatpump is trying a somewhat higher frequency before it settles. TH3 drops because of this (we are extracting more heat from the air)
@Timbones might be on to something, that the defrosting is not working as it should and then defrost too often
@F1p Is going to grab me a version with higher resolution later tonight but got a few more events. These don’t seem as bad?
TH3 seems to go back to before value. Its defrosting 30 mins after the previous, that seems too fast, is it very humid outside?
Can you plot the defrost, discharge temp and compressor frequency ?
yeah 80% is fine, defrost every 30 mins is only normal at > 90% humidity and near outside temp <= 2
Your discharge temp seems a bit high. You mentioned that the installer is coming by, ask them to check for low amount of refrigerant. Complain about way too low COP.
[edit] Hmm ftc7, so R290, I don’t know the normal range for the discharge temps 
That could be an explanation of the bad COP and too frequent defrost. Is your system defrosting with mid temperatures?
Its R32 not R290.
Depends on what mid temperatures are:
Randomly picked another day with ‘ish’ temps:
Latest defrost with more granular data:
I can mention that I asked people here and they recommended checking for low refrigerant due to a lot of defrosts & low COP
I see multiple defrosts around 6c outside temp, was it humid ? I would not expect this to happen with 6c outside temp. You can mention that and your bad COP.
Not sure tbh. Don’t have reliable humidity history