diff --git a/esphome/components/whirlpool/whirlpool.cpp b/esphome/components/whirlpool/whirlpool.cpp
index d8db3b7353..eba08d5bbe 100644
--- a/esphome/components/whirlpool/whirlpool.cpp
+++ b/esphome/components/whirlpool/whirlpool.cpp
@@ -105,7 +105,7 @@ void WhirlpoolClimate::transmit_state() {
   }
 
   // Checksum
-  for (uint8_t i = 2; i < 12; i++)
+  for (uint8_t i = 2; i < 13; i++)
     remote_state[13] ^= remote_state[i];
   for (uint8_t i = 14; i < 20; i++)
     remote_state[20] ^= remote_state[i];
@@ -184,7 +184,7 @@ bool WhirlpoolClimate::on_receive(remote_base::RemoteReceiveData data) {
   uint8_t checksum13 = 0;
   uint8_t checksum20 = 0;
   // Calculate  checksum and compare with signal value.
-  for (uint8_t i = 2; i < 12; i++)
+  for (uint8_t i = 2; i < 13; i++)
     checksum13 ^= remote_state[i];
   for (uint8_t i = 14; i < 20; i++)
     checksum20 ^= remote_state[i];