diff --git a/electrum/address_synchronizer.py b/electrum/address_synchronizer.py
index 922372014..bc2c0067c 100644
--- a/electrum/address_synchronizer.py
+++ b/electrum/address_synchronizer.py
@@ -86,7 +86,7 @@ class AddressSynchronizer(Logger):
         # locks: if you need to take multiple ones, acquire them in the order they are defined here!
         self.lock = threading.RLock()
         self.transaction_lock = threading.RLock()
-        self.future_tx = {}  # type: Dict[str, int]  # txid -> blocks remaining
+        self.future_tx = {}  # type: Dict[str, int]  # txid -> wanted height
         # Transactions pending verification.  txid -> tx_height. Access with self.lock.
         self.unverified_tx = defaultdict(int)
         # true when synchronized
@@ -626,12 +626,11 @@ class AddressSynchronizer(Logger):
             return cached_local_height
         return self.network.get_local_height() if self.network else self.db.get('stored_height', 0)
 
-    def add_future_tx(self, tx: Transaction, num_blocks: int) -> bool:
-        assert num_blocks > 0, num_blocks
+    def add_future_tx(self, tx: Transaction, wanted_height: int) -> bool:
         with self.lock:
             tx_was_added = self.add_transaction(tx)
             if tx_was_added:
-                self.future_tx[tx.txid()] = num_blocks
+                self.future_tx[tx.txid()] = wanted_height
             return tx_was_added
 
     def get_tx_height(self, tx_hash: str) -> TxMinedInfo:
@@ -646,9 +645,11 @@ class AddressSynchronizer(Logger):
                 height = self.unverified_tx[tx_hash]
                 return TxMinedInfo(height=height, conf=0)
             elif tx_hash in self.future_tx:
-                num_blocks_remainining = self.future_tx[tx_hash]
-                assert num_blocks_remainining > 0, num_blocks_remainining
-                return TxMinedInfo(height=TX_HEIGHT_FUTURE, conf=-num_blocks_remainining)
+                num_blocks_remainining = self.future_tx[tx_hash] - self.get_local_height()
+                if num_blocks_remainining > 0:
+                    return TxMinedInfo(height=TX_HEIGHT_FUTURE, conf=-num_blocks_remainining)
+                else:
+                    return TxMinedInfo(height=TX_HEIGHT_LOCAL, conf=0)
             else:
                 # local transaction
                 return TxMinedInfo(height=TX_HEIGHT_LOCAL, conf=0)
diff --git a/electrum/lnwatcher.py b/electrum/lnwatcher.py
index 6d8a2ec3a..aebc8468a 100644
--- a/electrum/lnwatcher.py
+++ b/electrum/lnwatcher.py
@@ -411,16 +411,16 @@ class LNWalletWatcher(LNWatcher):
     async def try_redeem(self, prevout: str, sweep_info: 'SweepInfo', chan_id_for_log: str, name: str) -> None:
         prev_txid, prev_index = prevout.split(':')
         broadcast = True
+        local_height = self.network.get_local_height()
         if sweep_info.cltv_expiry:
-            local_height = self.network.get_local_height()
-            remaining = sweep_info.cltv_expiry - local_height
-            if remaining > 0:
+            wanted_height = sweep_info.cltv_expiry - local_height
+            if wanted_height - local_height > 0:
                 broadcast = False
                 reason = 'waiting for {}: CLTV ({} > {}), prevout {}'.format(name, local_height, sweep_info.cltv_expiry, prevout)
         if sweep_info.csv_delay:
             prev_height = self.get_tx_height(prev_txid)
-            remaining = sweep_info.csv_delay - prev_height.conf
-            if remaining > 0:
+            wanted_height = sweep_info.csv_delay + prev_height.height - 1
+            if wanted_height - local_height > 0:
                 broadcast = False
                 reason = 'waiting for {}: CSV ({} >= {}), prevout: {}'.format(name, prev_height.conf, sweep_info.csv_delay, prevout)
         tx = sweep_info.gen_tx()
@@ -432,13 +432,13 @@ class LNWalletWatcher(LNWatcher):
         if broadcast:
             await self.network.try_broadcasting(tx, name)
         else:
-            if self.lnworker.wallet.db.get_transaction(txid):
+            if txid in self.lnworker.wallet.future_tx:
                 return
             self.logger.debug(f'(chan {chan_id_for_log}) trying to redeem {name}: {prevout}')
             self.logger.info(reason)
             # it's OK to add local transaction, the fee will be recomputed
             try:
-                tx_was_added = self.lnworker.wallet.add_future_tx(tx, remaining)
+                tx_was_added = self.lnworker.wallet.add_future_tx(tx, wanted_height)
             except Exception as e:
                 self.logger.info(f'could not add future tx: {name}. prevout: {prevout} {str(e)}')
                 tx_was_added = False