Fault finding and diagnosis
65
Worcester 2000 – 6 721 814 551 (2019/09)
229 B Flame lost during burner operation. ▶ Check the main shut-off valve, open if necessary.
▶ Check the appliance isolation valve, open if necessary.
▶ Measure the gas supply pressure at the rated heat input. If necessary, shut down
the appliance and check the gas line.
▶ Check flame sense electrode and connecting lead, replace if required.
▶ Check venturi/injector for potential blockage.
▶ Measure the ionisation current.
▶ Check the protective conductor connection in the control unit.
▶ Check the ignition cable for damage, replace if necessary.
▶ Check functionality of gas valve and replace if necessary.
▶ Check burner setting value at rated heat input.
▶ Check burner setting value at the lowest output.
▶ Check flue system.
▶ Check combustion air supply.
▶ Check the heat exchanger on the flue gas side for deposits, clean if necessary.
232 B Heat source locked by external switching
contact.
▶ Connect the plug for the external switching contact.
▶ Install jumper/check condensate pump according to manufacturer's
specifications.
▶ Adapt switching point of the external temperature switch to the system.
▶ Replace connecting lead to the external temperature switch.
▶ Replace external temperature switch.
233 V Fault in code plug or appliance electronics. ▶ Check whether code plug is installed.
▶ Check appliance electronics, replace if necessary.
234 V Electrical fault in gas valve. ▶ Check the connecting lead, replace if required.
▶ Check the gas valve, replace if required.
235 V Version conflict between appliance electronics
and code plug.
▶ Check software version of appliance electronics and code plug.
▶ Replace appliance electronics or code plug.
237 V System fault. ▶ Check and replace code plug.
▶ Check and replace the appliance electronics.
238 V appliance electronics faulty. ▶ Check and replace the appliance electronics.
242 V System fault, appliance electronics. ▶ Reset control appliance / burner control unit - factory reset.
▶ Reconnect electrical connections at control unit / burner control unit correctly.
▶ Replace the control unit/burner control unit.
244 V System fault, appliance electronics / basic
controller.
▶ Reset control unit / burner control unit - factory reset.
▶ Reconnect electrical connections at control unit / burner control unit correctly.
▶ Replace the control unit/burner control unit.
246
247
257
– Internal burner control fault. ▶ Reset burner control - factory reset.
▶ Check electrical connections of burner control.
▶ Replace burner control.
245
249
250
251
252
253
254
V
V
V
V
V
V
V
System fault, appliance electronics. ▶ Reset appliance electronics - factory reset.
▶ Check electrical connections.
▶ Replace the appliance electronics.
256 V System fault, appliance electronics / basic
controller.
▶ Reset control unit / burner control unit - factory reset.
▶ Reconnect electrical connections at control unit / burner control unit correctly.
▶ Replace the control unit/burner control unit.
258 V Internal fault in control unit. ▶ Reset control unit - factory reset.
▶ Reconnect electrical connections at control unit correctly.
▶ Replace control unit.
259
262
263
V
V
V
System fault, appliance electronics. ▶ Reset appliance electronics - factory reset.
▶ Check electrical connections.
▶ Replace the appliance electronics.
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