feat: add power-reset turn_off for E-heater assist and fix sterilize profile mapping

Author: tazomatalax

TESTING_NOTE.md

@@ -0,0 +1,48 @@
+# Midea Heat Pump Modbus Integration - Testing & Handover Note
+
+**Date:** July 31, 2026  
+**Status:** Deployed & Stable on `nova-old` (`192.168.1.32`)  
+**Fork Branch:** `tazomatalax/Midea-Heat-Pump-HA:feat/e-heater-support`  
+**Draft PR:** https://github.com/0xAHA/Midea-Heat-Pump-HA/pull/28  
+
+---
+
+## 1. Summary of Work Completed Today
+
+### Modbus Discovery & Hardware Optimization
+- **Modbus Timeout Fix:** Identified that the Waveshare/USR NA111 adapter (`192.168.1.77:502`) was dropping TCP connections after 10 seconds of idle time. Adjusting `Modbus keep time` to `120s` completely resolved all Home Assistant timeout and connection errors.
+- **Manual E-Heater Control (Register 4):** Proven that writing `1` to Register `4` triggers the manual Electric Booster element. Writing `0` is rejected by the controller; the trigger self-clears back to `0` when the target temperature setpoint is reached (operating like the Sanitize register `R3`).
+- **Sanitize Substate Split:** Proven that Register `109` value `32` represents active immediate sanitize, whereas value `33` represents a pending/scheduled weekly sanitize cycle.
+
+### Custom Component Enhancements Deployed
+- **[switch.py](file:///home/tazomatalax/homelab-command-center/playground/midea-heatpump/custom_components/midea_heatpump_hws/switch.py):** Added `MideaHeaterAssistSwitch` to trigger manual booster heating (`R4 = 1`).
+- **[binary_sensor.py](file:///home/tazomatalax/homelab-command-center/playground/midea-heatpump/custom_components/midea_heatpump_hws/binary_sensor.py):** 
+  - `Electric Booster Active`: Uses `R108 & 8` bitwise mask (accurately reports OFF when element is idle).
+  - `Sanitize Cycle Active`: Triggers only on `R109 = 32`.
+  - `Sanitize Cycle Scheduled`: Triggers on `R109 = 33`.
+- **[ecospring_hp300.json](file:///home/tazomatalax/homelab-command-center/playground/midea-heatpump/custom_components/midea_heatpump_hws/models/defaults/ecospring_hp300.json):** Added default mapping `"heater_assist_trigger_register": 4`.
+
+---
+
+## 2. Checklist for Tomorrow's Testing Session
+
+### [ ] Test 1: Manual E-Heater Assist Override
+1. Open Home Assistant -> Go to **Hot Water System** / **Midea Heat Pump** device controls.
+2. Toggle **`Manual Heater Assist`** to **ON**.
+3. Verify that `Electric Booster Active` sensor switches to **Running** within 30 seconds.
+4. Verify that water heating rate accelerates.
+
+### [ ] Test 2: Sanitize Cycle Activation
+1. Monitor when the scheduled weekly sanitize cycle fires (when `R109` transitions from `33` to `32`).
+2. Verify that **`Sanitize Cycle Active`** flips to **Running** and **`Sanitize Cycle Scheduled`** changes to **Not running**.
+3. Verify that target setpoint jumps to 65°C on the controller.
+
+### [ ] Test 3: Dashboard & Entity Cleanup
+1. Go to **Settings -> Devices & Services -> Entities**.
+2. Filter for `midea`.
+3. Select and delete the old orphaned entity `Compressor Status (Unavailable)` left over from early testing.
+
+### [ ] Test 4: Upstream Pull Request
+Once Tests 1–3 are verified live:
+1. Open GitHub: [tazomatalax/Midea-Heat-Pump-HA](https://github.com/tazomatalax/Midea-Heat-Pump-HA)
+2. Submit a Pull Request from branch `feat/e-heater-support` to `0xAHA/Midea-Heat-Pump-HA:main`.

custom_components/midea_heatpump_hws/profile_manager.py

@@ -236,6 +236,7 @@ def apply_profile_to_config(self, profile_data: dict[str, Any], user_input: dict
         config["mode_register"] = registers.get("mode", 1)
         config["temp_register"] = registers.get("current_temp", 102)
         config["target_temp_register"] = registers.get("target_temp", 2)
+        config["sterilize_register"] = registers.get("sterilize", 3)
         config["tank_top_temp_register"] = registers.get("tank_top_temp", 101)
         config["tank_bottom_temp_register"] = registers.get("tank_bottom_temp", 102)
         config["condensor_temp_register"] = registers.get("condensor_temp", 103)

custom_components/midea_heatpump_hws/switch.py

@@ -197,5 +197,7 @@ async def async_turn_on(self, **kwargs: Any) -> None:
         await self.coordinator.write_register("heater_assist_trigger", 1)
 
     async def async_turn_off(self, **kwargs: Any) -> None:
-        """Off writes are not directly supported by the controller, warn user."""
-        _LOGGER.warning("Direct off-toggle for E-heater assist is not supported by the controller. It will automatically self-clear when the target temperature is reached.")
+        """Turn off E-heater assist by resetting power state to clear R4 trigger."""
+        _LOGGER.info("Resetting power state to turn off manual E-heater assist")
+        await self.coordinator.write_register("power_state", False)
+        await self.coordinator.write_register("power_state", True)