Bosch · Heat Pumps
The flow of heat transfer fluid in your heating system is inadequate, leading to poor and uneven heating or cooling performance from the Heat Pump.
Click steps to track your progress.
Ensure all radiator valves and other heating system valves are fully open.
Check that all radiator thermostats are set to your desired temperature or fully open.
If the problem persists, ensure your system is properly vented.