diff --git a/src/specificClass.js b/src/specificClass.js
index 7dcc278..0499b49 100644
--- a/src/specificClass.js
+++ b/src/specificClass.js
@@ -1281,6 +1281,25 @@ class MachineGroup {
             return;
         }
 
+        // Skip abort + redispatch when the demand hasn't changed beyond a
+        // small tolerance. PS ticks every 1 s and re-fires the same demand
+        // while the basin level evolves slowly; without this guard, every
+        // PS tick aborted in-flight pump moves before they could finish
+        // (move duration ~0.4 s, abort cycle 1 s, but each abort
+        // immediately re-issued the same setpoint, so pumps got stuck
+        // ramping from the same starting position to the same target
+        // forever). Tolerance is 0.5 % — small enough that real demand
+        // changes still propagate, big enough to filter PS hysteresis
+        // float jitter.
+        const prev = this._lastDemandQ;
+        const unchanged = Number.isFinite(prev)
+            && Math.abs(demandQ - prev) < Math.max(0.5, Math.abs(prev) * 0.005);
+        if (unchanged) {
+            this.logger.debug(`Demand ${demandQ} unchanged from ${prev}; skipping abort+redispatch`);
+            return;
+        }
+        this._lastDemandQ = demandQ;
+
         //abort current movements
         await this.abortActiveMovements("new demand received");