{"action":"created","issue":{"url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/2692","labels_url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/2692/labels{/name}","comments_url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/2692/comments","events_url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/2692/events","html_url":"https://github.com/MarlinFirmware/Marlin/issues/2692","id":110660884,"number":2692,"title":"bed temperature runaway, auto leveling.","user":{"login":"pbrgle1","id":14819847,"avatar_url":"https://avatars.githubusercontent.com/u/14819847?v=3","gravatar_id":"","url":"https://api.github.com/users/pbrgle1","html_url":"https://github.com/pbrgle1","followers_url":"https://api.github.com/users/pbrgle1/followers","following_url":"https://api.github.com/users/pbrgle1/following{/other_user}","gists_url":"https://api.github.com/users/pbrgle1/gists{/gist_id}","starred_url":"https://api.github.com/users/pbrgle1/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/pbrgle1/subscriptions","organizations_url":"https://api.github.com/users/pbrgle1/orgs","repos_url":"https://api.github.com/users/pbrgle1/repos","events_url":"https://api.github.com/users/pbrgle1/events{/privacy}","received_events_url":"https://api.github.com/users/pbrgle1/received_events","type":"User","site_admin":false},"labels":[{"url":"https://api.github.com/repos/MarlinFirmware/Marlin/labels/Support%20Question","name":"Support Question","color":"cc317c"}],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":9,"created_at":"2015-10-09T13:39:03Z","updated_at":"2015-10-12T21:21:38Z","closed_at":null,"body":"Since i upgraded to auto bed leveling i keep getting thermal runaway errors for my heat bed. The temperature readings freeze and after the THERMAL_PROTECTION_BED_PERIOD the printer disconnects. This issue happens only when i want to print. If i leave the bed set to 100C while not printing there is no problem. "},"comment":{"url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/comments/147526034","html_url":"https://github.com/MarlinFirmware/Marlin/issues/2692#issuecomment-147526034","issue_url":"https://api.github.com/repos/MarlinFirmware/Marlin/issues/2692","id":147526034,"user":{"login":"AnHardt","id":211931,"avatar_url":"https://avatars.githubusercontent.com/u/211931?v=3","gravatar_id":"","url":"https://api.github.com/users/AnHardt","html_url":"https://github.com/AnHardt","followers_url":"https://api.github.com/users/AnHardt/followers","following_url":"https://api.github.com/users/AnHardt/following{/other_user}","gists_url":"https://api.github.com/users/AnHardt/gists{/gist_id}","starred_url":"https://api.github.com/users/AnHardt/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/AnHardt/subscriptions","organizations_url":"https://api.github.com/users/AnHardt/orgs","repos_url":"https://api.github.com/users/AnHardt/repos","events_url":"https://api.github.com/users/AnHardt/events{/privacy}","received_events_url":"https://api.github.com/users/AnHardt/received_events","type":"User","site_admin":false},"created_at":"2015-10-12T21:21:38Z","updated_at":"2015-10-12T21:21:38Z","body":"@ghuser2 \r\nGood finding.\r\n\r\nIf the temperature is still to unstable playing with\r\n```\r\n// Actual temperature must be close to target for this long before M109 returns success\r\n#define TEMP_RESIDENCY_TIME 10  // (seconds)\r\n#define TEMP_HYSTERESIS 3       // (degC) range of +/- temperatures considered \"close\" to the target one\r\n#define TEMP_WINDOW     1       // (degC) Window around target to start the residency timer x degC early.\r\n```\r\n\r\nand or tuning the PID values can improve the situation."}}