Led Displays At The Control Unit; Fault Display Control Valves; Display Error Codes Heat Meter - Worcester Greenstar HIU Installation And Maintenance Instructions Manual

Troubleshooting
11.3

LED displays at the control unit

Left LED Right LED Cause
Off Off Outdoor temperature sensor error
-- Red Heating flow temperature sensor fault
-- Red If the HIU detects a heating module, a low loss
header must be installed and its temperature sent
to the HIU.
-- Red PWM signal indicates a heating control valve fault
Red -- DHW volumetric flow rate sensor fault
Red -- Supply flow temperature sensor error
Red -- PWM signal indicates a DHW control valve fault
-- Yellow Supply return temperature sensor error
Yellow Yellow Flow temperature on primary side is lower than
heating or set DHW temperatures
Red Red Flow temperature on primary side higher than
allowed (95°C)
-- Flashes red Invalid position of the heating rotary selector
Flashes -- Invalid position of DHW rotary selector
red
Table 28
11.4

Fault display control valves

To access the On/Off indicators of the control valves:
▶ Remove the enclosure, insulation and control unit.
LED power-saving mode: if the position of the valves does not change for
15 seconds, the LED displays are not visible.
Dsiplay Remedy
Green flashing Valve is stuck completely open.
Green and Blue Valve is stuck open between 60 and 99,9 %.
flashing
Blue flashing Valve is stuck open between 40 and 60 %.
Blue and Orange Valve is stuck open between 0.1 and 40 %.
flashing
Green and Input signal fault. Valve is completely closed.
orange
Green, Blue and Valve fault.
Orange flashing
Table 29 Fault displays
Fig. 50 Control valve displays
[1] Circle - Green
[2] Square - Blue
[3] Triangle - Orange
26
Conclusions
No set value has been specified for weather-compensated control. The
heating function is not detecting a heating load.
Heating and frost protection functions are disabled
Heating function is deactivated.
Heating and frost protection functions are disabled
DHW and DHW circulation pump functions are disabled.
Bypass, DHW and DHW circulation pump functions are disabled.
By-pass, DHW and circulation pump functions are disabled
Return temperature limit function is not working.
Fault only detected, HIU will keep on trying to supply heat.
Control valves will be kept closed and so no function except heating
pump operation can be executed.
Heating function is deactivated.
Bypass, DHW and DHW circulation pump functions are disabled
Action of control valve during an error
In the event of a fault, the affected valve independently attempts a
recovery in order to unlock the fault.
Calibrating the control valves
▶ Manually set the rotary selector for the control valve on the control
unit to the calibration position
• Valve initially moves to fully closed position.
• Valve then moves to fully open position.
• Valve then moves back to normal mode.
▶ Set the rotary selector for the control valve on the control unit to the
required value.
11.5

Display Error codes heat meter

The error message disappears automatically as soon as the source of the
error is corrected.
Error code Description
C - 1
E 1
1)
E 3
E 4
E 5
1)
E 6
E 7
E 8
E 9
2)
E A
2)
E b
0010017858-01 0010017858-01 2)
E C
2)
E d
1) Application dependent
2) Optional
Table 30
.
Basic parameter error in flash or RAM - meter must be
replaced.
Temperature range outside (-19.9 °C...199.9 °C) e.g.
sensor short-circuit, sensor fault.
Flow/return temperature sensor reversed.
Hardware error flow measurement, e.g. transducer or
control defective or short circuit.
Communication not possible (too frequent read-out).
Flow direction incorrect.
Unstable ultrasonic signal, e. g. air in the measuring path.
No primary power supply (only with power supply unit);
supply via backup battery.
Battery nearly discharged, design lifetime reached.
Leak: leak detected in pipework.
Leak: leak detected in energy meter.
Leak: Leakage pulse input 1
Leak: Leakage pulse input 2
Greenstar – 6721852556 (2022/11)