However, there is a different interface available, called the “0-10V interface”, the HWS-IFAIP01U-E.
In the product description, it mentions the following:
HWS-IFAIP01U-E analog input 0~10V interface for R32 Estia
The HWS-IFAIP01U-E is an Analog Input 0~10V Interface, designed to allow customers to control ESTIA using external 0~10VDC inputs (maximum 3 inputs)
The control can be configured to use either direct CAPACITY control or setpoint temperature (heating/cooling/DHW) adjustment using new DN code
In the appendix manual of ESTIA R32 it also shows that the interface can be used to control it:
And besides “normal control” and “target temperature control” (both of which I have zero trust in by now), a “direct capacity control” is available, which sounds exactly like what’s required to make this heat pump suck just a tad less (by bypassing the internal decision-making process of the heat pump).
This 0-10V interface apparently can be bought for just ~200€, instead of the 600€ of the Modbus interface (which even was at 800€+ almost everywhere not that long ago).
Now for some reason (as seen in the last image) it appears that in direct control mode, the control range is limited to only 40%/50% - 100%, which I do not quite understand, because supposedly ESTIA can be controlled 10%-100%:
Nevertheless, it would probably still be better than the completely random stuff it’s doing right now for me.
Has anyone ever played with or looked into the 0-10V control option, on ESTIA or any other heat pump for that matter? Do you think this would be a feasible approach?
Dear XurxoFB,
many thanks for kind response. That was extremely helpful. My problem was switch S4 which has switches 2 and 3 undocmented so I never dared to move them. Once I turned them all off, unit started to reply. In contrast, S1 was OK in my case since I have hydro-unit “R32” type and that proved, indeed.
I must admit that given the price of €600 for the unit, the technical support from Toshiba is virtually non-existent in Czechia and my installation company was clueless with note they do not specialize on process-control.
Now, the remaining part is to configure the HA server for correct registers, but there is plenty of resources for this and since the modbus is up-and-running that’s going to be pretty relaxing task…
Whish you happy holidays and all the best in the New year.
Peter
Hi everyone,
I was struggling with my Estia heat pump in automatic heating mode. It would constantly increase RPM, leading to overheating of the underfloor heating (intake exceeding 36°C) and ultimately shutting down the compressor. Hot water worked fine, and manual heating at 36°C functioned correctly. Despite multiple service calls and sensor replacements (costing €3000!), the issue persisted.
Frustrated with the lack of a reliable solution and the prohibitive cost of the official bus module (€600), I decided to integrate my heat pump with Home Assistant using a DIY approach.
Here’s my setup:
ESP8266: For Wi-Fi connectivity and control.
2 Relay Modules: To control hot water and underfloor heating independently. I wired my relays to simulate pressing the buttons on the heat pump remote control.
2 Temperature Sensors: To monitor inlet and outlet temperatures of the underfloor heating.
PZM-004T Module: To measure energy consumption (optional for future analysis).
Current Functionality:
My current implementation involves a simple on/off cycle for the underfloor heating:
Turn on underfloor heating at 35°C for 30 minutes.
Wait for another 30 minutes.
Check the room temperature.
Repeat the cycle if necessary.
This approach effectively addresses my previous issues:
Reduced Overheating: The shorter heating cycles prevent excessive temperatures.
Improved Comfort: I can now maintain a comfortable temperature without overheating the house during the day.
Eliminated 24/7 Circulation: The on/off cycle significantly reduces energy consumption by avoiding continuous circulation pump operation.
While this is a basic solution, I plan to further refine it in the future by incorporating data from the PZM module to better understand the heat pump’s behavior and optimize energy usage.
I hope this solution provides a helpful alternative for others facing similar challenges with their Estia heat pumps.
Well, given the price of the heat-pump installation approximately €10000 two years ago I think €600 is not such big deal although I think that modbus piece of hardware has biggest margin of whole delivery.
Anyway, having control of DHW and heating/cooling is just enough for HA to take-over scheduling which is otherwise internal to built-in “remote” controller. Having hydro-unit to control compressor is OK for me as it already knows outside temperature and applies proper “pressure” as needed given available heat outside.
My control is to optimise costs by just turn on/off heating (40001) during high-tariffs hours when distribution price is higher. I can afford turn off heating because high-tariff is just 1 hour long. I have non-continuous 4 hours per day of this cut-off.
Additionally, for DHW, using HA to determine the lowest commodity price hour in the afternoon 3 hour window and early morning 2 time-window to switch on DHW (40002). I enable 40002 for 1 hour which is quite enough to warm-up DWH to 45°C.
If €600 is legitimate price for basically operating 2 switches programmatically is for individual consideration.Personally, I didn’t opt for disassembling the remote controller since the whole heat-pump installation is still covered by the warranty, although could be potentially resolved purchasing secondary remote controller to be ripped apart for just this purpose.
Please keep in mind that heat-pumps are optimized for running continuously, and cycling a lot (turning off & on often) will severely degrade the components and the heat pump will fail in <5 years instead of 15+ years. All modern heat pumps are inverter-controlled specifically so that they do not have to be turned off & on to maintain a certain temperature, but instead can be run continuously at 50% power.
I had already secondary controller to my toshiba estia. I was affraid I would have to turn off/remove one of them. It turned out, I didn't have to. Now it works great with 2 remote controllers and one modbus device. I got HWS-805XWHM3-E.
Might anyone find this usefull, there is a project on GitHub that is capable of controlling much of Toshiba Estia R410a and R32 heat pumps (and air conditioning units) through ESPHome and Home Assistant.
One of them runs on my first‑generation Toshiba Estia HWS‑1103H8‑E (R410A): DHW tank temperature, setpoint, DHW on/off, compressor and heater flags, outdoor temperature, compressor speed, current and run‑time counters all work.
