View Full Version : daikin problem

28-11-2007, 08:48 PM
i know l9 is compressor lock on a vrv2 system. But dont know were to go from here.On the same system uh and f3 came up on test could it be a pcb problem

The Viking
29-11-2007, 12:48 AM

L9 = Stall prevention
UH = Improper connection of transmission wiring between outdoor unit and outdoor unit outside control adaptor
F3 = Abnormal discharge pipe temp.

You might be right, the PCB might be on the blink..

But I would investigate a bit further before I order a new one.

Disconnect the inverted compressor, reset the unit and carry out a inverter check procedure just to see what happens.....

No doubt one of the Daikin guys will be able to give better information shortly.

29-11-2007, 11:29 AM
UH - Malfunction of system, refrigerant system address undefined

* if you didn't worked with automatic addressing you must set address for each indoor unit, maybe you forgot some
* check the wiring connection between indoor and outdoor unit.

F3 - Abnormal discharge pipe temperature outdoor unit

* check the discharge temperature sensor, they are on the right side of the outdoor unit PCB

L9 - Inverter startup error

* check if stop valve is opened
* is a difference between high and low pressure prior to startup 0.2MPa? If not check the refrigerant system.
* check compressor wires, and measure windings

If you need more help do not hesitate to ask