Troubleshooting iHeater Link

Device model: iHeater 200 W
Firmware version:
Material:
Temperature:
Problem description: Heater will not heat up. I hooked the iHeater via the portal and via the Moonraker option to my Snapmaker U1. I used a Seeed Studio ESP32-S3 to hook up the iHeater. Compliments for the description on the website (of course i had google to translate). I cannot make the iHeater to heat up. I tried via the portal but it did not work, also not in the Fluidd command line (M141 S50).

On the iHeater is one led flashing fast ( the most right one with the board oriented as on the website). Another question: is the fan spinning continously (not that i mind, just asking…)

Update: when i turn the heater on in the Portal the graph is changing, the heater element is not heateing up and i get this error: U1 / invoke / heat.start] Устройство не подтвердило команду в течение таймаута

I problably did something wrong but i cannot figure out what…

Thanks in advance
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