E9
Temperature errors and safety sensor issues
Worcester Bosch Greenstar Heatslave II
Cause 210 (Blocking)
Maximum temperature thermostat or air pressure switch activated. Flue gas or tank thermostat overheat. Reset the overheat thermostat or air pressure switch before resetting appliance.
Action
Reset
Cause 219 (Blocking)
Safety temperature too high. The main heat exchanger has overheated. Maximum temperature 105°C, wait 30 minutes and try a reset.
Action
Reset
Cause 220 (Blocking)
Safety sensor short circuit. Maximum temperature sensor on the main heat exchanger has failed.
Action
Reset
Cause 221 (Blocking)
Safety sensor open circuit. Maximum temperature sensor on the main heat exchanger has not been recognised.
Action
Reset
Cause 276 (Blocking)
Flow temperature exceeds 95°C. Primary overheat - boiler waits for temperature to reduce, wait approximately 30 minutes and try a reset.
Cause 277 (Blocking)
Safety temperature exceeds 95°C. Main heat exchanger safety sensor overheat - boiler waits for temperature to reduce, approximately 30 minutes.
This code also applies to: