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Description
1010 O
No BUS communication
1013 R
Max. combustion point reached
1018 W
Maintenance interval expired
1019
Incorrect pump type detected
1021 B
Cylinder charging or hot water temperature
sensor faulty
1023 R
Maximum run time including standby time
reached
1025 –
Return temp. sensor is faulty
1068 W
Outside temp. sensor or lambda probe
faulty
1073 W
Short circuit of the flow temperature sensor ▶ Check the flow temperature sensor plug is connected.
1074 W
No signal from flow temperature sensor
2085 V
Internal fault
2908 V
System fault boiler electronics/basic
controller
2910 V
Fault in flue system
2915 V
The fan keeps running after the post purge ▶ Reset the appliance.
2916 V
Gas valve was detected to be open during
post purge
2920 V
Fault in flame monitoring
2923 V
Unexpected feedback from the modulating/
current controlled gas valve
Greenstar 1000 – 6721835943 (2023/08)
Remedy
▶ 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 control unit (low voltage connection).
▶ If using the Key: Check the Key connections (black, white, red, green) are plugged in to
the correct position on the control unit. (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 control unit.
▶ 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.
▶ Check the maintenance date set in the menu.
▶ Reset the maintenance code via the reset menu.
▶ Pump communication failure or wrong pump is fitted (non-ErP).
▶ Check the pump communication wire is connected and has continuity.
▶ Replace the pump for correct modulating pump.
▶ Check the domestic hot water temperature sensor connected and the plug connected
to temperature sensor.
▶ Check the resistance of the temperature sensor and replace if required.
▶ Check the continuity of harness and replace if required.
▶ Check the maintenance menu.
▶ Reset the maintenance code via the reset menu.
Not fitted on the boiler.
▶ Check the outdoor sensor plug is connected.
▶ Check the resistance of the sensor and replace if required.
▶ Check the continuity of harness and replace if required.
▶ Replace the outdoor sensor.
▶ Check the resistance of the flow temperature sensor and replace if required.
▶ Check the continuity of harness and replace if required.
▶ Replace the flow temperature sensor.
▶ Check the flow temperature sensor plug is connected.
▶ Check the resistance of the flow temperature sensor and replace if required.
▶ Check the continuity of harness and replace if required.
▶ Replace the flow temperature sensor.
▶ Replace the PCB.
▶ Reset the appliance.
▶ Switch off the appliance for 30 s then turn back on.
▶ Check the incoming mains voltage.
▶ Check the polarity.
▶ Replace the PCB.
▶ Restart the appliance to see if the problem re-occurs.
▶ If the fault remains after resetting: the control unit is defective and must be replaced.
▶ Check the flue for obstructions and remove any found.
▶ Check the flue integrity ( Chapter 9.6, page 54).
▶ check for water in the sump and check the condensate trap operation.
▶ Create a heat demand; check if the boiler is operating.
▶ Check the voltage to the fan and the continuity of the fan harness.
▶ Check the power modulation on the fan.
▶ PCB may be defective.
▶ Carry out a localised tightness test on the gas valve and replace if required.
▶ Check the voltage to gas valve.
▶ The gas valve or the control unit may have a fault.
Possible control unit fault, no checks available.
Possible control unit fault, check the control unit.
Fault finding and diagnosis
91
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