Worcester Bosch E2 Fault Code Repair

Welcome to the fault-codes section of this site. The following table or page contains the information required to help repair and diagnose the fault codes being shown on the boiler display. You may be guided through the fault finding sequence or steps, for rectifying your boiler with this fault code. Suggested repair solutions may be provided by a link to a repair page. NB Some fault codes are only applicable to a specific range of boilers only.

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
		no	go 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?	yes	Reconnect 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.	yes	Switch 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.