Daikin highwall heat pump overheating room - how to make it stop heating at setpoint

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#3019062 9-Jan-2023 14:09

richms:

Not anymore, dry just runs it in cool but a slower fan speed so the air has time to condense out. In winter its useless to keep a room warm and dry and I run a normal dehumidifier.

Interesting, thanks.

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#3019064 9-Jan-2023 14:13

richms:

Why none of the aircons have a wireless temperature sensor for them is something I don't understand. Hell, they all still use a prehistoric IR remote protocol that makes it so you have to aim the remote like a 2000s dvd player.

my parents old one had a temperature sensor in the remote and you could choose to have use the remote as the temperature source or the unit itself or split the difference.

would not be difficult to do.

timmmay

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#3019065 9-Jan-2023 14:20

I can set up something in home assistant to use the temperature sensor on my desk, but it won't be especially pretty. HA can look at the desk temperature and increase or decrease the setpoint if it's too hot or too cold. I would probably do that in ApoDaemon / Python rather than a standard automation.

openmedia

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#3019130 9-Jan-2023 15:44

richms:

neb:

A problem with the "don't use auto mode" on heat pumps is that it dates from 15-20 years ago when they would mindlessly oscillate from heating to cooling mode to try and keep at the set point. Is this advice still relevant for today's systems?

Its irrelevent now with them all being inverter ones. What the problem is caused by is that they try to be too smart based on the limited input they have from a sensor on the device itself which is clearly not the room temperature.

Why none of the aircons have a wireless temperature sensor for them is something I don't understand. Hell, they all still use a prehistoric IR remote protocol that makes it so you have to aim the remote like a 2000s dvd player.

Our new Mitsubishi's bounce between heat/cool if in Auto mode. I've got Home Assistant collecting the state information and I can see it changing.

Generally known online as OpenMedia, now working for Red Hat APAC as a Technology Evangelist and Portfolio Architect. Still playing with MythTV and digital media on the side.

neb

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#3019147 9-Jan-2023 16:24

openmedia:
Our new Mitsubishi's bounce between heat/cool if in Auto mode. I've got Home Assistant collecting the state information and I can see it changing.

Good (if depressing) to know that in 20 years nothing has changed and the advice to avoid auto mode is still valid.

tweake

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#3019157 9-Jan-2023 17:37

auto mode, if the unit is working properly then it should be fine. mine here have a 2 degree split either way. ie if set for 22c, it won't turn on heating until it goes below 20c. it also won't turn on cooling until its over 24c. however that goes out the window if the unit is overshooting the temps. i think sizing is the big culprit here, but also temp sensor location and stray air currents. tho sometimes my main one will start to play up and usually resetting the heat pump will solve that.

timmmay

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#3019161 9-Jan-2023 17:45

tweake:

auto mode, if the unit is working properly then it should be fine. mine here have a 2 degree split either way. ie if set for 22c, it won't turn on heating until it goes below 20c. it also won't turn on cooling until its over 24c. however that goes out the window if the unit is overshooting the temps. i think sizing is the big culprit here, but also temp sensor location and stray air currents. tho sometimes my main one will start to play up and usually resetting the heat pump will solve that.

Thanks, but I don't see how unit capacity matters here. If it was overshooting, maybe, but it's not overshooting. It will be in heating mode but idle, the Daikin internal sensor showing 24 degrees, setpoint is 21 degrees, and it will turn on to add more heat. It's just a bit odd.

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tweake

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#3019234 9-Jan-2023 19:29

timmmay:

tweake:

auto mode, if the unit is working properly then it should be fine. mine here have a 2 degree split either way. ie if set for 22c, it won't turn on heating until it goes below 20c. it also won't turn on cooling until its over 24c. however that goes out the window if the unit is overshooting the temps. i think sizing is the big culprit here, but also temp sensor location and stray air currents. tho sometimes my main one will start to play up and usually resetting the heat pump will solve that.

Thanks, but I don't see how unit capacity matters here. If it was overshooting, maybe, but it's not overshooting. It will be in heating mode but idle, the Daikin internal sensor showing 24 degrees, setpoint is 21 degrees, and it will turn on to add more heat. It's just a bit odd.

that sounds like overshooting. not sure exactly why they do it but both my oversized ones do and the correct size one doesn't (tho thats a floor mount). i have seen overseas brands where you can adjust all the temp settings and its a little bit more complicated. they have a few extra bits i'm not familiar with. part of it may be to account for different heights. the install manual shows the minimum install height to be higher than the wall (2.4m). they may be made for a different market where 2.7m walls are common.

btw is it actually running and putting out heat, or just moving some warm air. they will run the fan every so often to check the temp. so a high wall will move the hotter air thats at ceiling height.

insane

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#3019290 9-Jan-2023 19:57

Final thought, do you have the ionizer enabled or some of air filtering setting that's causing the fan to continuously run?

And as tweaked said, sometimes turning them off and on again can indeed reset their sensors. This has worked for me with Panasonic units in the past if I've had a unit running continuously for more than a few days.

timmmay

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#3019310 9-Jan-2023 20:47

tweake:

that sounds like overshooting. not sure exactly why they do it but both my oversized ones do and the correct size one doesn't (tho thats a floor mount). i have seen overseas brands where you can adjust all the temp settings and its a little bit more complicated. they have a few extra bits i'm not familiar with. part of it may be to account for different heights. the install manual shows the minimum install height to be higher than the wall (2.4m). they may be made for a different market where 2.7m walls are common.

btw is it actually running and putting out heat, or just moving some warm air. they will run the fan every so often to check the temp. so a high wall will move the hotter air thats at ceiling height.

It's not overshooting. The fan can be completely off, set to heat mode 22, the room is 24 degrees, and it will start off and heat the room. It's not just blowing air about. It's not overshooting if it starts up explicitly. The unit is sized about right for the room. Thanks for the thought though.

timmmay

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#3019311 9-Jan-2023 20:49

insane: Final thought, do you have the ionizer enabled or some of air filtering setting that's causing the fan to continuously run?

And as tweaked said, sometimes turning them off and on again can indeed reset their sensors. This has worked for me with Panasonic units in the past if I've had a unit running continuously for more than a few days.

I don't think it has any of those ionisation type features. The unit usually runs in heat mode in the mornings, is turned off when it's warm enough maybe 11am, turned onto cool in the afternoon, then off at about 4pm. It doesn't run continuously. Thanks for the ideas though.

Stu1

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#3019328 9-Jan-2023 22:10

I have the same issue I hate the heatpump, I have had muiltple techs and complaints with Daiken. Basically there is a tolerance if you set it to 22 it wont stop even in auto mode to around 24 to 26 degrees.I even did a test and video to show the tech after 90 minutes the unit still wouldn’t stop even though the room was 26 and the unit was set to 21. The other issue is comfort mode only works in auto mode so it runs full tit so can’t hear the TV. The smart eco sensor doesn’t work as well wish you walk out of the room. The Daiken rep even admitted it’s not that good. I regret ever putting it in only use it in summer. Gave up and added more central heating vents in the new part of the house for winter

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#3019330 9-Jan-2023 22:33

Interesting, Stu. I have a ten year old Daikin that works fine, odd that the newer ones don't do well with temperatures. If I get around to automating remote temperature controls in Home Assistant I'll post the code, though HA is not particularly easy to use.

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#3019332 9-Jan-2023 22:46

timmmay:
Interesting, Stu. I have a ten year old Daikin that works fine, odd that the newer ones don't do well with temperatures. If I get around to automating remote temperature controls in Home Assistant I'll post the code, though HA is not particularly easy to use.

My one is a year old, I even had to pay the tech fee as they said it wasn’t a fault of the unit. Very disappointing experience with them , hope you get a solution for your problem

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#3019338 9-Jan-2023 22:59

It's looking like "it's a feature, not a bug", and I'll just have to get used to it.

Each heat pump is different. Fit6 the same level of comfort we set the heat pumps between 21c and 24c.

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