Samsung AE050JXYDEH/EU Installation Manual page 39

E911 the water is not moving fast enough (my units keep stopping or won't start)
If the E911 fault shows, it simply means that the flow rate through the unit is not high enough, there should be a flow meter installed on the system, if not
then you will need to fit one.
If you look at the flow meter then you will be able to see the flow rate in litres per minute.
The flow switch for 5kW units cuts out at 8 L/m and anything higher will cut out at 15 L/m. If the flow rate drops to this or below then E911 will show.
If you have air in the system it will start to trip the switch, if you hold the top of the flow switch you will be able to feel the paddle move and it will be rattling.
The main causes of E911 are:
The flow switch is mounted the wrong way, this can be turned around by loosening the head of the switch, there is an arrow on the head and this needs to
face in the direction of the flow.
Air in the system, this will need to be vented out. To do this, it's best to run the circulation pump for a while to clear the air, the best way to do so is to run it
in test mode, after a while the air should be cleared and commissioning can be started.
Another possibility is if the flow switch is too close to a pump, bend or valve, the flow switch should be fitted at least 150 mm from any other fitting.
To check the actual flow meter, remove it from the fitting and the PCB. Using a multimeter on ohms Ω setting, place the probes into the plug of the flow
switch, this should display the infinite symbol. Whilst the paddle is in its normal position, move the paddle and it should measure 0 ohms Ω.
If moving the paddle does not change the value then it is likely the flow switch is faulty.
Cold Weather Protection my unit won't start
The Samsung heat pump has a variety of cold weather protection functions, these are;
The heat pump will not start if the fluid in the system is 10°C or lower, if the sensors within the heat pump detect that the heat exchanger has reached 10°C
or less there are two things that the unit will do;
The first thing is the circulation pump will be activated for a few minutes to pump the fluid from inside the building to maintain the temperature. Also, if the
fluid coming back to the heat pump is cold but above 10°C, the unit will start in heating mode to bring the fluid temp to 20°C even without a run signal.
If the ambient (outside) temperature drops below -2°C the circulation pump will never stop, this is to stop any freezing.
To check the temperature in the system, press the view button until the house within the circle appears. This will tell you the temperature and the system will
respond accordingly.
If you happen to be commissioning from cold you will need to heat up the fluid, the best way to do this is to use the immersion in the cylinder to transfer
heated fluid from the cylinder to the heat pump.
E904 Error
If you come across an E904 error code, this means that there is an issue with the cylinder stat, this error will only show if the field setting 3011 is set to 1 and
the cylinder stat has an issue.
To see if this sensor is functioning correctly, press the view button until the tap symbol shows, this is the temperature inside the cylinder. If this shows -50 then
the sensor is not plugged into the socket on the MIM board.
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