E9
Safety sensor temperature too high / thermostat activated
Worcester Bosch Greenstar CDi Compact Combi
Cause 219 (Locking)
Safety sensor temperature too high. The main heat exchanger has overheated. Maximum temperature 105C°
Action
Reset button
Cause 220 (Locking)
Safety sensor short circuit. Maximum temperature sensor on the main heat exchanger has failed.
Action
Reset button
Cause 221 (Locking)
Safety sensor open circuit. Maximum temperature sensor on the main heat exchanger has not been recognised.
Action
Reset button
Cause 224 (Locking)
Max temperature thermostat activated. Flue gas thermostat overheat
Action
Reset button
Cause 224 (Blocking)
MAX thermostat activated. Flue gas thermostat overheat.
Cause 276 (Blocking)
Flow temperature exceeds 95°C. Primary overheat - boiler waits for temperature to reduce; if not it becomes a Locking error.
Cause 277 (Blocking)
Safety temperature exceeds 95°C. Main heat exchanger safety sensor overheat - boiler will wait for the temperature to reduce; if not it becomes a Locking error 219.
Cause 285 (Blocking)
Return temperature exceeds 95°C. The boiler will stop the burn and wait to see if it cools down. If after 2 seconds there is an increase in temperature the boiler will go to Locking error 286.
This code also applies to: