Daikin Wireless Thermostat

TreeWizard · 2025-11-11T12:33:39Z

The placement of my Modoka wired thermostat is far from optimal, it's upstairs, in close proximity to a radiator, so the temperature measured is normally quite a few degrees higher than the rest of the house. I've applied an offset to the temperature sensor, to match it to a thermometer downstairs, which does half the job. However, the temperature downstairs fluctuates more, and drops by quite a few degrees more than the thermostat. The obvious solution is to move the thermostat, so I can keep living areas warm, then throttle radiators back upstairs, but wiring it somewhere more sensible would be quite a challenge. I was surprised to see that Daikin don't have solution to solve this problem (unless I've missed it). Without much more investigation, I've started considering the following options: - Automatically modifying the thermostat temperature offset using another wireless thermometer - Automatically adjust the leaving water temperature offset, to effectively apply an alternative weather compensation curve. - Wireless serial bridge, so I can move the Modoka anywhere, or just replace with a wireless third party thermostat? I still need to understand the viability/practicality of the options, has anyone tried to tackle a similar problem?

Page 2 / 2 Prev

Air Source Heat Pumps (ASHPs)

Last Post by Judith 2 hours ago

13 Posts

6 Users

2 Reactions

244 Views

RSS

Judith

(@judith)

Noble Member Member

Joined: 2 years ago

Posts: 455

15/01/2026 10:17 pm

@bash we have mostly south facing rooms which would overheat if the radiators were still working on WC plus full sun. In fact in shoulder season the sun is plenty for the whole house in the day.

Our installer said try it for a full year (our installation was September) and see if we needed a TRV in the dining room room , which has the largest windows and no TRV since it was a new larger radiator. Our Vaillant has a mode which is called extended which switches the heat pump off when the room with the control box is too warm, so no issues with overheating.

If your Daikin doesn’t have a similar mode then despite the general advice of no TRV then in the high solar load rooms they might have a use. As long as there is always the minimum volume (perhaps in your hallway radiator and other non-sun rooms with noTRV) then the heat pump will be fine.. You need to set the lock shields to levels to provide you with the heat you need during the evening or very grey days and use something else to stop overheating (room thermostat or TRV.)

You seem to have confidence in your installer so ask them for advice but the simplest may be to have the thermostat in one of the sunny rooms, not necessarily the lounge if that’s logistically difficult.

You will find that you will be swinging any TRV between frost and 2 as a max, simply because your heat pump water flow will always be at a lower temperature.

2kW + Growatt & 4kW +Sunnyboy PV on south-facing roof Solar thermal. 9.5kWh Givenergy battery with AC3. MVHR. Vaillant 7kW ASHP (very pleased with it) open system operating on WC

ReplyQuote

Page 2 / 2 Prev