diff --git a/ansible/roles/gitea_runner/defaults/main.yml b/ansible/roles/gitea_runner/defaults/main.yml
index 1d991ce..cb8bd27 100644
--- a/ansible/roles/gitea_runner/defaults/main.yml
+++ b/ansible/roles/gitea_runner/defaults/main.yml
@@ -36,18 +36,20 @@ gitea_runner_prune_label: "gitea-runner=true"
 gitea_runner_service_restart_sec: "5"
 
 # Health check configuration
-# 2min interval — catches hung daemons before multiple CI jobs fail between checks.
-# The previous 5min interval was too coarse: a stuck daemon could fail 3+ molecule
-# jobs in the window between healthcheck runs.
-gitea_runner_healthcheck_interval: "2min"
+# 1min interval — catches hung daemons and disk exhaustion before multiple CI
+# jobs fail between checks. The previous 2min interval was too coarse under
+# parallel DinD load: a single molecule scenario can fill 10+ GB in 2 minutes,
+# causing subsequent scenarios on the same runner to fail with "Failed to
+# create temporary directory" (disk full).
+gitea_runner_healthcheck_interval: "1min"
 gitea_runner_healthcheck_boot_delay: "2min"
-gitea_runner_healthcheck_disk_threshold: 70
+gitea_runner_healthcheck_disk_threshold: 60
 # When disk reaches this level, prune EVERYTHING (no until-filter) — the
 # runner is dangerously full and the gentle until=1h prune isn't enough.
 # This removes all stopped containers and unused images regardless of age.
 # At 75%+, molecule containers fail with "container is not running" because
 # overlay2 runs out of space under parallel DinD load.
-gitea_runner_healthcheck_disk_critical: 75
+gitea_runner_healthcheck_disk_critical: 70
 gitea_runner_healthcheck_script_path: "{{ gitea_runner_config_dir }}/healthcheck.sh"
 
 # Auto-recovery: when the healthcheck detects an unregistered runner, it