Troubleshooting; Operating And Fault Displays; 10.1.1 General Information; 10.1.2 Error Code Table - Bosch Condens 8300i W Installation And Maintenance Instructions Manual

Troubleshooting

10 Troubleshooting
10.1

Operating and fault displays

10.1.1 General information

The Fault code specifies the cause of the fault.
The Fault category specifies the impact of a fault on the device
operation.
Fault category O (operating code)
Operating codes specifiy an operating condition in normal mode.
Fault category B (blocking faults)
Blocking faults result in the heating system being shut down temporarily.
The heating system restarts automatically as soon as the blocking fault is
removed.
Fault category V (locking faults)
Locking faults result in the heating system being shut down, and the
system can only be restarted after a reset.

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
46
The fault code of a locking fault flashes together with the H on the
display.
▶ Check if a serious fault is present.
▶ Switch the device off and back on again.
-or-
▶ Press the keys  and  at the same time until the symbols H and
! disappear.
The device resumes operation. The flowtemperature appears on the
display.
If a fault persists after a reset:
▶ Remedy the cause of the fault according to the details in the table
further down.
Fault category W (service displays)
Service displays indicate that a maintenance or repair has to be carried
out. The device is still in operation. If the service display has been caused
by a defect, under certain circumstances, it may continue running with
restricted functions.
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.
Condens 8300i W – 6721841533 (2022/12)