Samsung MIM-E03CN Installation And Maintenance Manual page 20

Troubleshooting
E904
Indicates a problem with the blue hot water cylinder sensor E904 only shows if field setting 3011 is set
to 1 (unit has a hot water cylinder)
To test this sensor, press the view button until the tap icon appears, this will show the temperature
its measuring, if this reading is -50 the sensor is not plugged into the yellow socket on the control box
PCB
E101, E102, E201
E101 shows on the indoor unit remote controller if the indoor unit cannot see the outdoor unit.E202
shows on the outdoor unit if it can't see the indoor unit This error appears if the power has been reset
to either unit or the outdoor unit is not on.
First wait 3 mins to see if the error disappears, if not remove the cover of the outdoor unit (the one
with Samsung written on it) and check the outdoor PCB display is lit up, If its not there is no power to
the outdoor unit.
If there is power at the outdoor unit check F1 F2 cable is connected to the indoor PCB and the outdoor
unit correctly, the cable must have no breaks or switches in it. If the cable is ok, it's possible one of the
PCBs is at fault. The hardest thing for an engineer to do is work out which end has the communication
error.
In the middle of the control box (indoor unit) PCB there are two LEDs, the red one shows the
communication leaving the control box, the orange / green led shows the communication coming
back from the outdoor unit. If there is a comms error E201 one or both of the LEDs will not be lit
indicating which PCB is at fault.
E919 legionella failure
If the cylinder does not reach the legionella set temperature in 8 hours, E919 shows on the screen. The immersion heater is switched off
automatically. The unit stops. If you reset it (press on off) the unit will run for another week then trip again.
Check 3041 =1, 3042 = Wednesday, 3043 =3AM, 3044 = 60°C
Check the immersion works, check the tank sensor is in the tank 100mm and is above the immersion heater. Check the tank thermostat
on the immersion is set to above 60°C.
Every Samsung heat pump fault code is now available on YouTube, search freedom heat pumps and the fault code and a simple to use
video will show you what you need to know.