F0
Software and sensor errors
Worcester Bosch Greenstar Heatslave II External
Cause 237 (Blocking)
Software relay error. Resistors between plug X4 pins 3 & 5 disconnected/>150k or water in the burner control box
Action
Reset
Cause 238 (Blocking)
Software relay error. Resistors between plug X4 pins 3 & 5 disconnected/>150k or water in the burner control box
Action
Reset
Cause 239 (Blocking)
Watchdog error
Action
Reset
Cause 259 (Blocking)
AD reference error
Action
Reset
Cause 263 (Blocking)
Appliance powered off with locking fault present. Locking fault present when powered off.
Action
Reset
Cause 278 (Blocking)
Sensor test error. On power up, all safety sensors are checked. Check has failed.
Action
Reset
Cause 279 (Blocking)
AD converter error
Action
Reset
Cause 290 (Blocking)
AD converter reference error
Action
Reset
This code also applies to: