Is anyone having problems with recent Daikin heat pumps?

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#3264075 24-Jul-2024 20:31

timmmay: I could try to gather data, home assistant monitors it here too, at the heat pump and at my desk. I don't leave it on the same temperature all day though, the room gets too hot.

Try monitoring it, they had that problem too, set it to 21 and found the room got way too hot and measured it at something like 28 as it had been slowly ramping up the temperature during the day.

tweake

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#3264076 24-Jul-2024 20:38

one other thing, do they have a ventilation system? if so where is the vent compared to the heat pump.

Stu1

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#3264078 24-Jul-2024 20:44

timmmay: There was a similar thread within the last year. Someone went to Daikin support and got a technician out and they said it was working fine so charged them for the callout fee.

I had to pay for the call out fee , still have same problems. Tonight it gets too hot , I just turn it off let the lounge cool down a bit then turn it back on . I think it’s a feature of the heat pump

timmmay

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#3264079 24-Jul-2024 20:49

I don't need to monitor to say all my Daikin high wall heat pumps do this, I know they do. I'd only have to monitor if I needed to prove it to Daikin.

It's not practical to leave there temperature set the same all day for me. It'd be too cold in the morning and too hot in the afternoon. If I thought Daikin would actually do something about it I could do it on the weekend, it only costs me about 50c a day to run since it's a small room.

neb

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#3264081 24-Jul-2024 20:50

Stu1: Tonight it gets too hot , I just turn it off let the lounge cool down a bit then turn it back on . I think it’s a feature of the heat pump

If you've got any temperature logging capability, check whether it's going slightly over or way, way over. If this is a fault in a large number of devices then they need to fix it - their response to date has been "we've sold thousands of these and have had no complaints", when from this thread it sounds like there's quite a few people experiencing this problem.

And it's not just an inconvenience, think of someone keeping a baby/toddler's room warm with one of these and they end up cooking them because they can't regulate their body temperature.

timmmay

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#3264082 24-Jul-2024 20:53

I'll see if I can get a decent graph to show it. If I can I'll see what I can do.

Even if I change the temperature it'll probably still show it isn't working well.

pih

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#3264083 24-Jul-2024 20:58

(Daikin ad): Ask yourself: Does it do what a Daikin does?

Ummm no, thankfully, it doesn't. That sounds really annoying.

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#3264085 24-Jul-2024 21:01

neb:

If you've got any temperature logging capability, check whether it's going slightly over or way, way over. If this is a fault in a large number of devices then they need to fix it - their response to date has been "we've sold thousands of these and have had no complaints", when from this thread it sounds like there's quite a few people experiencing this problem.

And it's not just an inconvenience, think of someone keeping a baby/toddler's room warm with one of these and they end up cooking them because they can't regulate their body temperature.

It's not important if you are the only one to have this problem or dozens or hundreds have the problem. Items need to be fit for purpose for a reasonable time. If it doesn't meet this criteria, you have recourse under NZ law.

Worst case you could take them to DT.

Stu1

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#3264089 24-Jul-2024 21:15

neb:

Stu1: Tonight it gets too hot , I just turn it off let the lounge cool down a bit then turn it back on . I think it’s a feature of the heat pump

If you've got any temperature logging capability, check whether it's going slightly over or way, way over. If this is a fault in a large number of devices then they need to fix it - their response to date has been "we've sold thousands of these and have had no complaints", when from this thread it sounds like there's quite a few people experiencing this problem.

And it's not just an inconvenience, think of someone keeping a baby/toddler's room warm with one of these and they end up cooking them because they can't regulate their body temperature.

I have just set it up with a Sensibo so will do some monitoring. We have central heating through the rest of the house just the daiken in the extension where I haven’t run additional vents. This is what the service tech came with

Daikin FTZM50U installed 12/2021

won't switch off auto mode

sensor not picking up when no-one in room & switch to Eco

SERVICE SUMMARY

Our service engineer attended the site on 15/07/22 and checked the following:

Pressure

Installation

Pipe work

Unit operation

DIAGNOSIS & RECOMMENDATION

Our service engineer recommends:

Use fan on low speed rather than auto

If issues continue may need to re-charge unit

dazzanz

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#3264154 24-Jul-2024 22:23

Not exactly the same but I have a Daikin multi split with 5 Zena Vogue units on it. Currently in one room I have it set to heat, 20 degrees. The unit reports in the app that it is 24 degrees and it maintains that temperature (it may drop to a reported 23 but it then goes back to 24). I have a separate thermometer in the room and it reports that it is 18 degrees - which I would believe. I would love to add an external temp sensor to it but I have no idea if that is possible.

I also have a Mitsubishi that seems much more accurate, I set it to 22 degrees and it heats to that and holds it, and the temperature is correct.

Senecio

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#3264169 25-Jul-2024 08:50

We have two Diakin heat pumps and they both overshoot the set point. Not by as much as the data presented in the OP and they don't continue to rise like the OP. We just set them a couple of degrees lower that what we want the room to feel like (eg. set to 20* to achieve 22*).

neb

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#3264268 25-Jul-2024 14:22

Here's the response to the various questions, sent via Signal so that's a lotta typing on a phone screen, reformatted slightly for here:

What's generating the data? The graphs are native graphs built-in to Home Assistant (HA). No effort at all to product that graph. HA will graph anything it logs.

ac Boys bdrm current temperature - is the Daikin reported "suction temperature" - the ambient return air temperature at the top of the coil (obviously at the top of the room)
ac Boys bdrm heating - is Daikin reporting the unit status, "Heating" which broadly shows active heating. Other states are "Off, Idle, Cooling"
ac Boys bdrm target temperature - is the Daikin reported temperature set point requested, the number on the remote you have asked for
ac Boys Bedroom Temperature - is a completely independent YoLink wireless temperature sensor sitting on a chest of drawers in the room, not in the direct airflow path of the ac unit
ac Boys bdrm Outside temperature - is the Daikin reported the outside ambient temperature, this is a sensor on the back of the outdoor coil, therefore measuring outside air temperature

All the Daikin data is coming from the Daikin Wi-Fi module on each ac unit. It's the same data that the Daikin app shows. There is an integration for HA that simply polls the Daikin about every 30 seconds and gets all this data, local polling not cloud.

About overshooting / oversized, etc. None of that really matters, because here's the essential questions:

Why did it work quite well in the beginning for 4 hours? After a very small initial overshoot, it got control of the room and between 0910 - 1230 hours it did a great job holding the room temperature steady, the green YoLink temperature correlates that.

If oversized / poor installation / etc - why didn't it fault from 0920 - 1230 hours?

Even as the outside temperature rose and then fell, from 1240 hours onwards it just began to slowly overheat the room, running another strong heating cycle every 20 mins regardless of the return air temperature.

tweake

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#3264282 25-Jul-2024 15:33

i was wondering if ventilation air was tripping the indoor sensor, but don't see any indication of that in the temps.

what looks interesting is when its in the temp rising period, the outdoor temp goes down suddenly like the sensor is to close to the coil, or has air flow issues.

the regularly running looks odd. its almost like its has a minimum run mode (keep the oil warm?). that can be a sizing issue, if its meant for a larger room then that room would not heat up when it does that.

an odd thing to check, but check if the clock setting on the remote is set right.

RunningMan

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#3264292 25-Jul-2024 15:52

neb:[snip] from 1240 hours onwards it just began to slowly overheat the room, running another strong heating cycle every 20 mins regardless of the return air temperature.

This sounds like reverting to some base line programme like limp mode in a car. It can't sense a temp or pressure or something so defaults to a timed repeating cycle.

timmmay

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#3264360 25-Jul-2024 17:10

Does this help? I didn't leave the heat pump at the same temperature all day, I have to turn it down twice because it was getting hotter and hotter. Daikin Cora FTXM25U high wall, in heat mode.

Key:

Office desk temperature - the temperature of a small Xiaomi sensor on my desk
Office Daikin current temperature - temperature sensor inside the Daikin
Office Daikin target temperature - setpoint
Office Daikin Heating - whether it's heating or not

Here's a narration:

At 0530 the room temperature is about 12.5 degrees. The heat pump is switched onto heat mode with a target temp of 23.
0830 the desk temperature is about 24 and the dakin temperature is about 25 and it's too hot. I turn the setpoint to 21. The Dakin keeps heating the room up to 25 degrees, 24 at the desk or a little more.
1200 it's too warm again, I turn the setpoint to 19. The room is quite warm and it's a bit sunny outside so the Daikin doesn't turn on for the rest of the day.

In summary, the Daikin always heats to above the temperature I set it to, and it gets hotter over time until it's so hot I need to turn it down manually. It's so reliable overheating the room that I have home assistant automations that do it for me, which I disabled today.

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