https://community.viessmann.de/t5/Getting-started-programming-with/API/m-p/625648#M737 <P>Subject: API device list returns only TCU — heating device (id=0) missing, but ViCare app works fine</P><P>Hello,</P><P>The IoT API does not return my boiler as a device, although the ViCare app<BR />shows all data correctly (DHW temperature, heating system status, gas<BR />consumption).</P><P>Details:<BR />- Gateway serial starts with: 7633...<BR />- Location: Uzbekistan<BR />- (I can provide the full installation ID and gateway serial via private<BR />message if needed.)</P><P>GET /iot/v2/equipment/installations/{id}/gateways/{serial}/devices<BR />returns only ONE device:<BR />- id: "TCU", deviceType: "tcu", with a single feature<BR />"tcu.features.wirelessRemoteController"</P><P>The expected heating device (id: "0", deviceType: "heating") is completely<BR />missing from the device list, so no heating.* or heating.dhw.* features are<BR />accessible via the API.</P><P>- OAuth2 (Authorization Code + PKCE) works fine, token is valid.<BR />- The API client was created more than 24 hours ago on the same account<BR />that owns the installation in ViCare.<BR />- The ViCare app on the same account shows heating and DHW data without<BR />any problems, so the boiler is registered and reporting to the cloud.</P><P>It looks like the heating device is not provisioned for API access on the<BR />backend. Could you please check and fix the device provisioning for this<BR />installation?</P><P>Thank you!</P> Sat, 04 Jul 2026 05:51:45 GMT zulfiqorman 2026-07-04T05:51:45Z https://community.viessmann.de/t5/Getting-started-programming-with/API/m-p/625648#M737 <P>Subject: API device list returns only TCU — heating device (id=0) missing, but ViCare app works fine</P><P>Hello,</P><P>The IoT API does not return my boiler as a device, although the ViCare app<BR />shows all data correctly (DHW temperature, heating system status, gas<BR />consumption).</P><P>Details:<BR />- Gateway serial starts with: 7633...<BR />- Location: Uzbekistan<BR />- (I can provide the full installation ID and gateway serial via private<BR />message if needed.)</P><P>GET /iot/v2/equipment/installations/{id}/gateways/{serial}/devices<BR />returns only ONE device:<BR />- id: "TCU", deviceType: "tcu", with a single feature<BR />"tcu.features.wirelessRemoteController"</P><P>The expected heating device (id: "0", deviceType: "heating") is completely<BR />missing from the device list, so no heating.* or heating.dhw.* features are<BR />accessible via the API.</P><P>- OAuth2 (Authorization Code + PKCE) works fine, token is valid.<BR />- The API client was created more than 24 hours ago on the same account<BR />that owns the installation in ViCare.<BR />- The ViCare app on the same account shows heating and DHW data without<BR />any problems, so the boiler is registered and reporting to the cloud.</P><P>It looks like the heating device is not provisioned for API access on the<BR />backend. Could you please check and fix the device provisioning for this<BR />installation?</P><P>Thank you!</P> Sat, 04 Jul 2026 05:51:45 GMT https://community.viessmann.de/t5/Getting-started-programming-with/API/m-p/625648#M737 zulfiqorman 2026-07-04T05:51:45Z