Worcester Greenstar 2000 Installation And Maintenance Instructions Manual page 78

Fault finding and diagnosis
Description
357 O Ventilation program
358 O Anti-seizing functn. active
360 V Incomparable code plug
362 V Boiler identification module or boiler
electronics faulty
363 V Ionisation current did not drop during
ionisation test
364 V Solenoid valve ev2 leaking.
365 V Solenoid valve ev1 leaking.
604 V System fault burner control unit
810 – Hot water remains cold
1010 O No BUS communication
1013 R Max. combustion point reached
1014 W Actual ionisation is too low
1018 W Maintenance interval expired
78
Remedy
Operating message, is not a fault: Venting program has been activated.
Operating message, is not a fault: blocking protection for the heating pump and the 3-way
valve is active.
If code plug is present:
▶ Check that correct plug is inserted.
▶ Check the code plug is not damaged.
▶ Replace the code plug if required.
If code plug is not present:
▶ Check appliance electronics (PCB), replace if necessary.
▶ Wrong code plug is inserted.
▶ Check the code plug is not damaged.
▶ Replace the code plug if required.
▶ Check and replace the ionisation cable.
▶ Check and replace the electrodes if required.
▶ Check and replace the control unit and/or burner control unit.
▶ Check the gas valve, replace if required.
▶ Check electrodes and connecting leads, replace if required.
▶ Check and replace the appliance electronics.
▶ Check the gas valve, replace if required.
▶ Check electrodes and connecting leads, replace if required.
▶ Check and replace the appliance electronics.
▶ Reset appliance - factory reset.
▶ If the fault persists following a reset, the burner control unit/PCB is faulty and must be
replaced.
▶ Prevent water from escaping.
▶ Position DHW temperature sensor correctly.
▶ If current is not being supplied to the 3-way valve, there is a problem in the cable
between the control panel and valve. Check screw terminals and cables.
▶ If current is being supplied to the 3-way valve but it is still not working, the valve is faulty
and must be replaced.
▶ If a voltage of approx. 230 V is measured at the terminals and the pump is not running,
the pump is faulty and must be replaced.
▶ Eliminate all faults in the cables. Vent if necessary.
▶ Replace the pump if there are any deviations whatsoever.
▶ Set the DHW heating to "Priority".
▶ If readings are different to the values in the table, replace the sensor.
▶ Check the HMI for display and remove the HMI and the test voltage to the HMI.
▶ Check the HMI plug on far right of the PCB (low voltage connection).
▶ If using the Key: Check the Key connections (black, white, red, green) are plugged in to
the correct position on the PCB. (Next to orange BUS connection leaving one space.)
Check the pins on the plug.
▶ Check the bridging links are in LR & 230 V out.
▶ Replace the board.
▶ Check the 230 V external wiring does not run alongside the BUS connections.
▶ Check the maintenance menu.
▶ Reset the maintenance code via the reset menu.
Tip: Check the ceramic insulator is not damaged, this can cause the spark to earth, twist
and pull the ceramic insulator to ensure it is not broken.
▶ Check the flame sense and the lead and replace if required.
▶ Check the earth tags on the boiler and on the electrodes.
▶ Check the operation of the siphon and no water collecting in the sump.
▶ Replace the air and/or gas ratio control valve.
▶ Replace the control unit and/or burner control unit.
▶ Check the maintenance date set in the menu.
▶ Reset the maintenance code via the reset menu.
Greenstar 2000 – 6 721 820 552 (2021/02)