diff --git a/esphome/components/opentherm/opentherm.cpp b/esphome/components/opentherm/opentherm.cpp
index e05dbf8d82..3343871cd0 100644
--- a/esphome/components/opentherm/opentherm.cpp
+++ b/esphome/components/opentherm/opentherm.cpp
@@ -114,6 +114,7 @@ bool OpenTherm::get_protocol_error(OpenThermError &error) {
 void OpenTherm::stop() {
   this->stop_timer_();
   this->mode_ = OperationMode::IDLE;
+  this->out_pin_->digital_write(true);
 }
 
 void IRAM_ATTR OpenTherm::read_() {