Worcester 7735600658, Installation And Maintenance Instructions Manual

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Troubleshooting
Greenstar – 6721852556 (2022/11) 26
11.3 LED displays at the control unit
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.
Table 29 Fault displays
Fig. 50 Control valve displays
[1] Circle - Green
[2] Square - Blue
[3] Triangle - Orange
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.
Table 30
Left LED Right LED Cause Conclusions
Off Off Outdoor temperature sensor error No set value has been specified for weather-compensated control. The
heating function is not detecting a heating load.
-- Red Heating flow temperature sensor fault Heating and frost protection functions are disabled
-- Red If the HIU detects a heating module, a low loss
header must be installed and its temperature sent
to the HIU. Heating function is deactivated.
-- Red PWM signal indicates a heating control valve fault Heating and frost protection functions are disabled
Red -- DHW volumetric flow rate sensor fault DHW and DHW circulation pump functions are disabled.
Red -- Supply flow temperature sensor error Bypass, DHW and DHW circulation pump functions are disabled.
Red -- PWM signal indicates a DHW control valve fault By-pass, DHW and circulation pump functions are disabled
-- Yellow Supply return temperature sensor error Return temperature limit function is not working.
Yellow Yellow Flow temperature on primary side is lower than
heating or set DHW temperatures Fault only detected, HIU will keep on trying to supply heat.
Red Red Flow temperature on primary side higher than
allowed (95°C) Control valves will be kept closed and so no function except heating
pump operation can be executed.
-- Flashes red Invalid position of the heating rotary selector Heating function is deactivated.
Flashes
red -- Invalid position of DHW rotary selector Bypass, DHW and DHW circulation pump functions are disabled
Dsiplay Remedy
Green flashing Valve is stuck completely open.
Green and Blue
flashing Valve is stuck open between 60 and 99,9 %.
Blue flashing Valve is stuck open between 40 and 60 %.
Blue and Orange
flashing Valve is stuck open between 0.1 and 40 %.
Green and
orange Input signal fault. Valve is completely closed.
Green, Blue and
Orange flashing Valve fault.
0010017858-01 0010017858-01
Error code Description
C - 1 Basic parameter error in flash or RAM - meter must be
replaced.
E 1 Temperature range outside (-19.9 °C...199.9 °C) e.g.
sensor short-circuit, sensor fault.
E 3
1)
1) Application dependent
Flow/return temperature sensor reversed.
E 4 Hardware error flow measurement, e.g. transducer or
control defective or short circuit.
E 5 Communication not possible (too frequent read-out).
E 6
1)
Flow direction incorrect.
E 7 Unstable ultrasonic signal, e. g. air in the measuring path.
E 8 No primary power supply (only with power supply unit);
supply via backup battery.
E 9 Battery nearly discharged, design lifetime reached.
E A
2)
2) Optional
Leak: leak detected in pipework.
E b
2)
Leak: leak detected in energy meter.
E C
2)
Leak: Leakage pulse input 1
E d
2)
Leak: Leakage pulse input 2