Samsung EHS AE050RXYDEG/EU Manual page 187

11. Trouble shooting
Fault
The pump is blocked
The pump is making
noise (cavitation)
The pressure relief
valve opens
The water pressure
relief valve leaks
Installer reference guide / Mono tank integrated type
Possible cause
• If the unit has been powered off for a long
time, lime might block the rotor of the pump.
• Flow error E911 is displayed.
• There is air in the system.
• The water pressure at the pump inlet is
too low.
• The expansion vessel is broken or sized too
small for the total volume.
• The valve (if equipped) of the water circuit
towards the expansion vessel is closed.
• The water volume in the installation is too
high.
• The water circuit head pressure is too high.
• Dirt is blocking the water pressure relief valve
outlet.
Remedy
• When a locked rotor occurs for 3 seconds, a
locked rotor fault is reported.
• The pump stops working and the
indicator(Both MAX & PWM LED) flashes 5
times.
• Every 8 seconds, the pump tries to re-start.
If the fault is not eliminated, after 5 failed
attempts the pump will no longer re-start.
• The indicator continues to flash. The pump
requires a power reset.
• If the fault continues, disassemble the pump
and clean and free the locked rotor.
• The pump is blocked or there is not sufficient
voltage towards the pump.
• Purge air from the system by opening the
automatic air vent.
• Check and make sure that
– The water pressure is >1 bar.
– The water pressure sensor is not broken.
– The expansion vessel is not broken.
– The valve (if equipped) of the water circuit
towards the expansion vessel is open.
– The pre-pressure setting of the expansion
vessel is correct.
– The strainer is clean.
• Replace the expansion vessel or add another
after determining the needed expansion size.
• Open the valve.
• Make sure that the water volume in the
installation is below the maximum allowed
value.
• The pressure relief valve is 3 bar. Check the
water circuit head pressure.
• Check that the pressure relief valve is
working properly by turning the valve on or
off.
• If the water keeps running out of the unit,
close both the water inlet and outlet shut-off
valves first and then if broken, replace it. The
system must have a good working pressure
relief valve for operating safely.
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