Improve critical low temperature handling

diff --git a/v10/main.c b/v10/main.c
index e4ec589..3fe37df 100644 (file)
--- a/v10/main.c
+++ b/v10/main.c
@@ -458,7 +458,12 @@ void mode_update(void)
                        forced_target_temp = sc_conf.auto_forced_target_heater_temp;
                        forced_heater_duration = sc_conf.auto_forced_heater_duration * T_MULT;
                        forced_cmd_val = sc_conf.auto_forced_mode_value;
-                       forced_heater_delay = sc_conf.auto_forced_heater_delay * T_MULT;
+                       if (water_centi_degrees > 200) {
+                               forced_heater_delay = sc_conf.auto_forced_heater_delay * T_MULT;
+                       } else {
+                               /* Water is about to freeze, do not delay forced heating */
+                               forced_heater_delay = 0;
+                       }
                }
        }