Samsung RC090MHXEA Installation Manual page 12

Electrically testing the unit:
It is possible to test each component one after another using a service function. You can use
this to make sure you have wired everything correctly.
To access service mode press
stat is connected adjust temperature on stat up.
If stat is wired to B22 Heat1 will replace test on screen.
If stat is wired to B24 Heat 2 will be displayed.
If both stats 1 and 2 are operating heat 1 and 2 will flash one after
the other. Watch out for this, wireless stats can cause problems
where they send a signal which the unit sees on both terminals, it
sees this through the neutral, if this happens you will need a relay.
To exit service mode press and hold cancel delete for 6 seconds
www.samsungehs.co.uk
blue set button and test button together for 6 seconds.
The controller will display TEST. Immediately press the
top left button to turn the pump on and leave it running
while in test mode to avoid a fault.
Press the top left button the unit will run the pump.
Press the grey set button to start the backup boiler
Using the blue view
sensors, inlet and outlet to the heat exchanger, the red
sensor (where used), water cylinder and sensor in the
remote controller.
To test the external run signal or
©G Hendra September 2014
button you can see 5 temperature
12