10.1.2 Error Code Table - Bosch Condens 8300i W Installation And Maintenance Instructions Manual

Troubleshooting

10.1.2 Error code table

Fault text on the display, description
200 O Boiler in heating mode
201 O Boiler in hot water mode
202 O Boiler in anti-cycle mode
203 O Boiler in standby, no heat energy demand
204 O Current prim. water temp. higher than set
val.
208 O Chimney sweep demand
214 V Fan shut down during safety time
224 V Maximal flue gas thermostat or heat
exchanger maximal thermostat has
activated
227 V No flame signal after ignition
228 V Flame signal without flame present
229 B Flame failed during burner operation
50
Remedy
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1. Check the plug on the fan.
2. Check the connecting lead to the fan.
Heating circuit:
1. Check that the heating water is circulating correctly.
2. Open the closed valve in the heating circuit.
3. Top up water until the preset pressure is reached.
4. Connect the plug to the heating block temperature limiter correctly.
5. Check heating block temperature limiter, replace if required.
Potable water circuit:
Check that the potable water in the cylinder circuit is circulating correctly.
1. Open the main shut-off valve.
2. Open the device shut-off valve.
3. Interrupt the power supply of the appliance and check the gas line.
4. Check the supply pressure of the gas line.
5. Check that the burner is working correctly, adjust burner if necessary.
6. Check CO value of combustion air, adjust if necessary.
2
7. Establish protective conductor connection (PE) in the control device.
8. Carry out function check for ignition.
9. Carry out function check for ionisation.
10.Connect the plug for the ionisation and ignition sections correctly.
11.Connect the plug for the air/gas ratio control valve correctly.
12.Check condensate pipes.
13. Check flue gas side of heat exchanger for pollution.
14.Check flame sense electrode, replace if necessary.
15.Check ignition electrode, replace if necessary.
16.Check ignition electrode connecting lead, replace if necessary.
17.Check flame sense electrode connecting lead, replace if necessary.
18.Check air/gas ratio control valve, replace if necessary.
19.Check control device/burner control unit, replace if necessary.
1. Check ionisation cable, replace if necessary.
2. Check electrode set, replace if necessary.
3. Replace the control device.
1. Open the main shut-off valve.
2. Open the device shut-off valve.
3. Shut down the device and check the gas line.
4. Signal evaluation on printed circuit board defective.
5. Replace flame sense electrode.
6. Establish protective conductor connection (PE) in the control device.
7. Replace ignition cable.
8. Replace the connecting lead to the flame sense electrode.
9. Replace air/gas ratio control valve.
10.Set the burner correctly or replace the burner nozzles.
11.Set the burner at minimum rated load.
12.Convert the flue system.
13.The interconnected combustion air supply is too low or the ventilation opening is too
small.
14. Clean the heating block on the flue gas side.
15.Replace control device/burner control unit.
Condens 8300i W – 6721841531 (2022/10)