Daikin VRV III U3 error

[NESMA]

This is the first time we do installation of vrviii, and we make all wiring connections according to the installation manual diagrams, but when we turned on the power for the indoors and outdoors units H2P is blincking and U3 error monitored on the remote controller.
would you please make your effort to assist us

[Brian_UK]

U3 with VRVII shows that the initial CHECK function has not been completed.

Do you VRVIII Design Guide ?

[NESMA]

Thank you for your reply
would please explain what do you mean by internal check

[Suffolk Fridge]

press and hold the test button to perform a test run. this will last for approx 45 mins. Or do a quick test with mode 2 binary 3. When your test run has completed, all of the controllers will flash "p7" when this happens, press the return button on the condensing unit, and happy days. This is the quick way of commissioning, but the refrigerant containment function will not be available.

[Brian_UK]

^^ Demonstrates the need to have the correct instruction manual to hand and also to read it.

[cool#9]

press and hold the test button to perform a test run. this will last for approx 45 mins. Or do a quick test with mode 2 binary 3. When your test run has completed, all of the controllers will flash "p7" when this happens, press the return button on the condensing unit, and happy days. This is the quick way of commissioning, but the refrigerant containment function will not be available.

Hi all.
Do the right long test too feed correctly the oil from the accumulator to the compressor and wait to reach the same temperature between the inlet and the outlet of the accumulator.
From factory there's a low oil level inside the inverter compressor to facilitate startup at low ambient condition and avoid stall prevention.
rgds
cool#9

[2007eng]

Hi
This will help: