Why does my second unit sometimes start up unexpectedly on a Daikin split system?
Firstly forgive me im a noob in this space, I may get some terminology wrong, but I have been down the channels of trying to get help from the installers and from Daikin direct and I need some expert advice.
I have a problem, that is a little difficult to explain, on the face of it looks like a mode conflict error but it is not.
I hope someone out there has experienced this because according to Daikin and my installer I have a completely unique problem. Which I suspect is not right.
Here goes:
I have a Daikin outdoor Air source heater / cooler compressor (can take up to 5 aircon units) I have two ducted aircon Daikin Sky Sir units connected to it.
Loft - 3.5 kw
Kitchen - 6kw
I have Madoka wall wired thermostat controllers for each.
Symptom
Ever since the install I have a strange situation where 'Sometimes' the kitchen unit turns and heats when the loft unit is turned on, never the other way around.
When it does this the unti is not controllable by its local Madoka or Madoka App, it is pumping out hot air, it show nothing of note onscreen other than the conflict symbol (which you would expect) but it should not turn itself on.
How to replicate the issue
This happens when the units are in different modes to each other, regardless of whether the kitchen unit is on or not.
I can also fix the this problem temporarily by running the kitchen unit in the same mode as the loft for a period of time, sometime 5 mins, sometime an hour.
When it is fixed, the kitchen unit NEVER comes on unless I change the mode (Even if it is off)
I have proven that I can get the unit into a mode where the kitchen does not come on at all and also break it by changing the kitchen mode.
Troubleshoots and other info
Daikin are not interested in helping they said initially that this was design behaviour as the loft unit was too small for the compressor and needs to vent of pressure to other unit on the circuit, hence the kitchen unit turns on. BUT if that were true it would happen every time I run the loft unit and it clearly doesnt.
And if it was default behaviour it is a terrible design
The installers have never seen this issue before, they are a fairly sizeable company and have done thousands of installs. They mainly install Daikin.
We have been through all combinations of field settings and there is nothing seemingly out of place. No units are set to master, they are not setup as groups.
I hope that someone out there has seen something like this before OR has something for me to try. Maybe a full system reset?? no-one seems to know how to do that.
Many thanks in advance.
-
Warm weather and heat pumps.
18 hours ago
-
Installing your own ASHP - DIY
2 weeks ago
-
Oversized Daikin 9kw
3 weeks ago
-
ASHP install contract and BUS grant money
2 months ago
-
High air source heat pump running costs – Vaillant AroTherm Plus
2 months ago
- 22 Forums
- 2,052 Topics
- 44.8 K Posts
- 55 Online
- 3,283 Members
Join Us!
Trusted Installers
Struggling to find a reliable heat pump installer? A poor installation can lead to inefficiencies and high running costs. We now connect homeowners with top-rated installers who deliver quality work and excellent service.
✅ Verified, trusted & experienced installers
✅ Nationwide coverage expanding
✅ Special offers available
Latest Posts
-
RE: Tariff and charging strategy advice please
They haven't asked me to prove that I have an EV (I do)...
By JamesPa , 42 seconds ago
-
RE: Yes, the "zoning with ASHP" topic again...
@johnmo Thanks for sharing the full schematic, Johnmo....
By HarryRea , 10 minutes ago
-
@editor I found some info in the service manual it coul...
By Gary , 1 hour ago
-
RE: Solar Power Output – Let’s Compare Generation Figures
Took a while to find on the OFGEN site: ”The FIT sche...
By AgentGeorge , 5 hours ago
-
RE: why solar diverters for HW instead of the heat pump?
For me there are few factors why you may want to heat w...
By Johnmo , 6 hours ago
-
RE: Hydronic plinth heaters and ASHPs
@editor yes I think so. It will be a while until I get ...
By benson , 6 hours ago
-
RE: Aira Heat Pump: Stylish Scandinavian Heating
I’m an Aira customer with a 6kW Outdoor Unit in a small...
By KevinPotts , 15 hours ago
-
RE: Is your heat pump insured?
@richard24738 good to hear. I’ll also review them this ...
By Mars , 15 hours ago
-
RE: Warm weather and heat pumps.
Just looked at my WC setting, it is programmed for 25 D...
By Johnmo , 18 hours ago
-
RE: How to disable radiator heating in LG HM161MR
Just to add to above,when adjusting WC heat pump should...
By JamesPa , 1 day ago
-
@johnmo yes I can believe that. It seems to be human na...
By SUNandAIR , 1 day ago
-
RE: Help optimising my system!
I would be doing things a little more simply. Your heat...
By Johnmo , 1 day ago
-
RE: Renewables & Heat Pumps in the News
If you want to read a huge amount of speculation, fabri...
By Judith , 2 days ago
-
IVT Greenline high pressure switch and electrical cassette errors
I have an IVT Greenline HT Plus C heat pump that is con...
By tdudgeon , 2 days ago
-
RE: Volumisers in Heat Pump Systems: Does Placement Matter?
Not sure if you have the defrost cycle and what happens...
By Johnmo , 2 days ago
-
RE: Additional Battery v Wind Turbine v Ripple
There was a call today for Ripple investors and amongst...
By Judith , 3 days ago
-
-
RE: Commencing on an ASHP Installation Process
I think you may very well be right and of course A2A ca...
By JamesPa , 4 days ago
-