2966
Flow temperature rise in heat exchanger too rapid
Worcester Bosch Greenstar 4000 (from May 2021)
Remedy
▶ System is not filled with water.
▶ No water flow, because CH system is closed.
▶ No water flow, because pump is not operating correctly.
▶ Check pump is operating freely check voltage to pump.
▶ Check the isolation valves.
▶ Check for air locks in the system, purge if required.
▶ Check flow through appliance and system pressure.
This code also applies to: