Worcester Bosch E2 Fault Code Repair

This page contains the information required to help repair and diagnose the fault codes being shown on the boiler display. The following table will take you through the fault finding sequence for rectifying a Worcester Bosch boiler with this fault code

E2 and fault indicator LED are flashing
Then Flow temperature NTC sensor defective

 Check Action
1.Check if the flow temperature NTC sensor connector is corroded, damaged or dirty.yes-Change relative parts. E2? go to 2
nogo to 2
2.Switch OFF the appliance.
- Disconnect the boiler power
connection.
- Unplug 20-pin connector from
PCB.
- Check resistance from
connections 8 to 9 on the cable side. Does the value match the ones described in table 38, page 71?
yesReconnect the boiler electrical connection.
- Switch ON the appliance.
- Make a note of the altered service function settings (see table 6 on page 18) in order to keep the altered values.
- Switch OFF the appliance.
- Disconnect the boiler power connection.
- Change PCB control board.
- Reconnect the appliance power connection.
- Switch ON the appliance.
- Restore service settings previously noted down.
no:go to 3
3.- Un-plug NTC sensor from cable.
- Check resistance of NTC sensor.

Does the value match the ones
described in table 38, page 71?

- Reconnect the appliance power connection.
yesSwitch OFF the appliance.
- Disconnect the boiler power connection.
- Change the 20-pin connector lead assembly.
- Reconnect the boiler electrical connection.
- Switch ON the appliance.
no:B Change NTC sensor.

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