ESPAltherma 2 - Targets / power limit: hydro board software 20017701 (EHSXB08P50EF, ECH2O 4-8 kW)

[forTT78]

Version: ESPAltherma 2 (installed with the web installer)

Firmware version: 2.0.0-beta.25 (own build with the mDNS fix from #639 and modem sleep off; control code unchanged)

Board: M5Stack Atom Lite

Heat pump: Indoor EHSXB08P50EF, outdoor ERGA06EVA3H

Model chosen in ESPAltherma: Altherma(ERGA E EHSH-X P30-50 E_EF series 04-08kW-ECH2O), detected (confidence high), confirmed

What happens:

Following the request in #604 ("units with other hydro software: open an issue with the version the card shows").

My hydro board reports software ID 20017701, which is not in the table in #604, so the experimental targets and the power limit stay off ("unsupported"). The closest known ID is 20017704 (4-8 kW ECH2O E, "waiting for a first report"). The same unit family, so 20017701 is probably an earlier software of that board.

What the survey shows (/api/detect, id):

iu_sw_id       20017701                                                                    
iu_sw          7107                                                                        
iu_as          AS1709231-24 B                                                              
iu_eeprom      017092312402                                                                
iu_cap         80                                                                          
iu_opt         3                                                                           
iu_eeprom_ver  0                                                                           
iu_code        0000                                                                        
ou_eeprom      015029630702                                                                
ou_pn          1P502963-7                                                                  

I can help with a profile for this software:

• read back hydro board memory with Diagnostics → memory read (/api/memory, read only) at any addresses you name, for example the 20017704 addresses, so you can compare the layout;
• set DHW / main zone LWT to weather dependent and test a write once a profile exists, and report back.

On the ECH2O the hydro board software is updated only by Daikin service, so asking for 20017704 is not an easy alternative.
If you know that 20017701 shares 20017704's layout, that would also answer it.

Event history: [optional: Diagnostics → Event history → Copy]
Heat pump survey:

{                                                                                       
  "v": 1,                                                                               
  "fw": "2.0.0-beta.25-mdnsfix-otadiag-nosleep",                                        
  "board": "m5stack-atom",                                                              
  "protocol": "I",                                                                      
  "key": "I|63:017092312402|60:7107|CAP:50|11:015029630702|00:----",                    
  "id": {                                                                               
    "iu_eeprom": "017092312402",                                                        
    "iu_as": "AS1709231-24 B",                                                          
    "iu_sw": "7107",                                                                    
    "iu_sw_id": "20017701",                                                             
    "iu_cap": 80,                                                                       
    "iu_opt": 3,                                                                        
    "iu_eeprom_ver": 0,                                                                    
    "iu_code": "0000",                                                                     
    "ou_eeprom": "015029630702",                                                        
    "ou_pn": "1P502963-7",                                                              
    "ou_mpu": "----",                                                                   
    "ou_cap": null                                                                      
  },                                                                                    
  "regs": {                                                                             
    "60": "80001A00000050B8012601400203710700",                                         
    "00": "04010001010100000101",                                                       
    "10": "010000000000F3040000000000000000",                                           
    "11": "015029630702",                                                               
    "20": "32000000030200000F0000000000000001",                                         
    "21": "12004700690000000000000000000000",                                           
    "30": "0C4200750000000000000000000000",                                             
    "A0": "00008001000000000000FFFF00000000",                                           
    "A1": "00000000000000000000000000000000",                                           
    "61": "80002E011B01FC00F9009A01C8000000",                                           
    "62": "8000087801C800002047000E420000CF00",                                         
    "63": "80000170923124021D0100644000000000",                                         
    "64": "8000020000000026014000009D010503",                                           
    "65": "80002E0100000000000000000000000000",                                         
    "66": null                                                                          
  },                                                                                    
  "detect": {                                                                           
    "model": "Altherma(ERGA E EHSH-X P30-50 E_EF series 04-08kW-ECH2O)",                
    "family": "G",                                                                      
    "confidence": "high",                                                               
    "method": "as_number",                                                              
    "margin": 100,                                                                      
    "candidates": [                                                                     
       {                                                                                 
         "model": "Altherma(ERGA E EHSH-X P30-50 E_EF series 04-08kW-ECH2O)",            
         "score": 52                                                                     
       }                                                                                 
    ]                                                                                   
  }                                                                                     
}                                                                                       

[raomin]

Thanks for the report and the offer. 20017701 has no software image I can work from, so the profile has to come from your board's memory, the way 20002202 came from @Senaxx's dump. The good news: the unit's settings memory has the same layout as 20017704 at every byte the control uses, so only the working-memory addresses are unknown, and they are probably shifted a little from 20017704's.

Could you read 0x3000 to 0x5FFF, in 64-byte blocks? It is read-only (the R command), about 200 reads. Something like this in a linux;

B=http://<board>
for a in $(seq $((0x3000)) 64 $((0x5FC0))); do
  A=$(printf '0x%04X' $a)
  curl -s -X POST $B/api/memory -H 'Content-Type: application/json' -d "{\"addr\":\"$A\",\"len\":64}" >/dev/null
  for i in 1 2 3 4 5 6 7 8 9 10; do sleep 0.5; r=$(curl -s $B/api/memory); case "$r" in *'"done":true'*) break;; esac; done
  echo "$r"
done > dump_20017701.txt

Then attach the file. Please also tell me what the interface shows at the time of the dump: the setpoint mode of the tank and of the main zone, the points of each weather-dependent curve, and the power limitation settings ([4-08], [4-09] and limit 1). With those values I can find the curve words, the limit records and the limitation bytes in the dump, check them against 20017704's layout, and add the profile. After that, step 1 is the read-only check on the card, and only then a write.

[forTT78]

Thanks! Here is the read-only dump of 0x3000–0x5FFF in 64-byte blocks: 192 reads, all "ok":true, none missing. It was taken on 2026-11-08 at 06:08 local time with your loop (I only added a retry on "busy", which never happened). File attached: dump_20017701.txt

What the unit showed at the time of the dump (nothing was changed in between):

• Tank (DHW): setpoint mode fixed, setpoint 44 °C, operation mode "reheat only"
• Main zone: setpoint mode weather-dependent, controlled on leaving water temperature
• Heating curve (main zone): outdoor −15 °C → 35 °C leaving water, outdoor 20 °C → 25 °C leaving water
• Cooling curve (main zone): outdoor 20 °C → 22 °C leaving water, outdoor 35 °C → 18 °C leaving water
• Power limitation: [4-08] = 0 (none), [4-09] = 1 (power, kW), limit 1: [5-05] = 50 A, [5-09] = 20.0 kW

The values were read from the unit's settings and HomeAssistant (P1P2MQTT).
I'm happy to do the read-only check on the card when the profile is ready.

[raomin]

Dump received, thanks: everything matched. 20017701 is 20017704 with the settings block 0x18 lower, the limit records 0xC5 lower and the limitation bytes 0xB4 lower; your curve (25 at 20 °C, 35 at -15), the limits 20.0 kW / 50 A, [4-08] 0 / [4-09] 1, the 44 °C tank target and the 26.4 °C leaving water target all read where the profile says. It is in the next beta. Step 1 then: tick the leaving water box only (your tank is in fixed mode, that card will say "not curve mode"), and check the card shows 20017701, a range 25-45 and the curve 25/35, without asking a target. Only after that, a target one degree away. The counters (hours, energy) I could not place in your dump, that can wait.