dakin split

[richardrichard]

hi ,its my first time on here ,,,just wondered if any 1 can help. ive gat a daikin 407 split system ..its not running ,, its got an e4 fault code on the display .. which i know is a low pressure problem ,, have reclaim the gas and leaked tested , no problems found ,, so i recharged the system .. still didnt run,, when i pushed the contacter 2 get the compressor 2 run the suction and the high side both went down 2 -1 on the gauges .. just like it was vacing it self down ..changed the pc board but still doing the same thing ..has any 1 got any ideas

many thanks

rich

[ChillTechnican]

hi there richard , where do you have your guages connected ? are they both on the suction side? . are all valves open to the indoor unit?

[richardrichard]

hi ya ,,the gauges are on the suction and the discharge ..i have checked 2 make sure the valves r open on the unit ..i thought some 1 had shut the discharge side myself ... cos it seems like the unit is pumping it self down
any help would be greatfull
thanks rich

[A/C MAX]

Hi Rich, did you check the low pressure sensor?

[Gary]

Are the indoor fans running? What are the air on/air off temps?

[icecube51]

is your wriring correct connected??

Ice

[wandowski]

what is the expansion device?if cappilary then sounds like the strainer is blocked or some where in expansion line!how much refirgerant did you reclaim?

[nick uk]

had problems with 407 daikin before was suction strainer colapsed inside and blocked caused by liquid slugging symptoms are unit appears to pump down was 10 kw wall

[The Viking]

Rich,

Is one of your gauge lines connected inside the outdoor unit or are they both on the outside of it?
Is it a heat pump or cooling only?

Assuming both your hoses are connected on the outside of the outdoor unit, it is likely that you are looking at a blocked strainer/ cap tube or a failed EEV (most likely the EEV's motor or actuator, have you checked the lead between that and the PCB?)

Happy hunting.


If you got a model no, I will dig out the wiring diagram.