FAULT FINDING AND DIAGNOSIS
6 720 803 800 (2012/11)68
BLOCKING ERRORS
F0 237 Internal error Call Worcester, Bosch Group
Technical helpline 0844 892 3366
238
Gas valve error Reset button Leaking gas valve
239
242 - 256
258
259
262
263
267
272
279
290
Internal error Call Worcester, Bosch Group
Technical helpline 0844 892 3366
278 Sensor test failed Reset button On power up all safety sensors are checked.
Check has failed.
280
Recycle time error Reset button After the burner has stopped, the recycle mode purges gas from the
heat exchanger before attempting to burn again. The software has 3.1
seconds to intervene before the boiler goes into this fault condition.
338
Too many short burner starts
without confirmation
Reset button There is an error where the pump is not detecting water.
F7 228 Flame error Reset button False flame. Flame detected before burner start.
328 Internal error Replace control board
FA 306 False flame error Reset button Flame detected after burner stop
FD 231 Mains power error Reset button Electrical power interruption.
FA 364 Gas valve EV2 leak test failed Reset button Gas valve leak.
Fb 365 Gas valve EV1 leak test failed Reset button Gas valve leak.
Fault
code
Cause
code Description Possible cause
A1 281 Pump stuck or running in air Little or no water in the system.
C1 264 Airflow stopped during operation Fan has stopped.
C4 273 Airflow present during last 24 hours Fan has been running continuously during the past 24 hours.
D1 240 Return sensor short circuit Wet sensor.
Blocking for 300 secs before going to Locking error ( table 21).
241
Return sensor disconnected Blocking for 300 secs before going to Locking error ( table 21).
D4 271 Temperature difference between flow and
safety sensors exceeds limit
The temperature of the primary flow and the safety sensor on the WB7 should
be within 15°C of each other.
Table 22 Blocking codes
Fault codes
Cause
codes Description Reset type Possible cause
Table 21 Locking fault and cause code listing
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