2970
Pressure drop in heating system too rapid
Worcester Bosch Greenstar 4000 (before May 2021)
Remedy
Too many unexpected pressure drops within a short time period.
Cause code can appear if system is pressurised and the system then vented.
▶ Re-pressurise manually and vent the system.
▶ Ensure the correct pressure. If cause code does not clear, power off appliance.
This code also applies to: