We have a delonghi cs600 split air con , sometimes the outside fan starts sometimes it doesnt ,

this is very intermittent, sometimes when first putting it on other times we could turn it of after running for a hour or so then put it on again and sometimes it will start other times it wont,

we can make it start very easy by using a small stick to start the fan, once it has started it is fine.

We have tried changing the capacitors the 30uf the 2.5uf and the 2uf none of this has made any difference , the 30uf did look like it may have had a problem because a little liquid had leaked from the bottom but after changing it the fan was still the same, the original 30uf they dont sell anymore so we brought one that said 440v + - 10% the old one said 450v + - 5% . But the fan works exactly the same as before sometimes starting sometimes not.

The fan blades move nice and smooth and easily when we move them with our hands and sounds normal,

Would anyone have any idea what to try next

 

Would anyone have an idea I really dont know what to try next,

 

What are the uf numbers of your old capacitor ? is it a dual or two single capacitors ? That 30 uf is for your compressor, not for your fan.

 

Welcome to the forums.

That is primarily a North American based site. We don't have that model here the you have in the UK.
When I try to find useful service info it's in a different language. It also shows the model you posted as a free standing A/C unit..... not a split.

 

It is two single capacitors a 2uf (condensor capacitor) and a 2.5 uf (vent capacitor) ,we replaced them with the same as before but the outside fan still runs the same sometimes starting sometimes not , touching the fan very gently with a stick does make it start ,

I cant seem to find any manuals apart from the user manual which is very basic on how to turn it on ect. It is a cs600 eco spilt air con

 

If you can push the fan to start it, it means either capacitor or fan motor is bad. Usually it was caused by a bad capacitor. but if the capacitor is new and good, then the fan motor is bad. you can try another capacitor to make sure, or you can measure the new capacitor to make sure it is 2 uf. or if it is a very old condenser fan, you can try 2.5 uf for that fan, to give it a little more power. (indoor vent fan use a different 2.5 uf capacitor should have nothing to do with outside fan)

 

We have just noticed it has another capacitor called a noise capacitor hidden in the corner , what would this capacitor be for,

also when we start the air con it sometimes comes on straight away and sometimes we have to wait three minutes (which is what it is supossed to do, it says in the user Manuel)
I dont know if any of this could be why the fan outside sometimes starts and sometimes dosent.

 

Not sure what the other capacitor for unless you can figure it out by checking the wiring. Do you know what the other capacitor's uf is ? you have to find out which one is for your fan. IF you don't know, replace it anyway. Capacitor is much cheaper than fan motor and easy to replace. The 3 minutes wait time is your built-in time delay. when you shutdown the AC, you won't be able to start it rightaway (wait for 3 minutes is to protect your compressor). This time delay is by design, it does not cause the fan problem.

 

The noise capacitor is only 0·47 uf

 

That cap is for noise filtering on the AC line. It will not cause your problem.

 

The 2·5 uf vent cap seems to be the problem , when we replaced it with the same it still had the same problem, the only thing that was different between the two was the original had four pins at the top and the new one had two leads so we had to use connectors to connect it, but it still had a problem,

we have tried putting a 2uf in (with four pins not two leads) and it seems to be working, the outside fan is starting every time.

What is the difference between 2.5uf and a 2uf , can I use the 2uf ? Or will it damage something.

We tested the volts both have 440v printed on them , the 2·5 uf had 240v going through and the 2uf has 360v going through,

I cant seem to buy a 2.5uf locally with the pins(only two leads ,which didn't seem to work) but I have just got a 3uf whould this be better than useing a 2uf?

 

2 uf is fine if it starts the fan. just less capacitance, it won't damage anything. do not use 3uf capacitor.

 

I Thought (by things I have read) if you couldnt get the right size uf you should use a slightly larger, even the shop said to use a larger size because the two uf will eventually cause a problem , I dont understand the uf meaning at all

I have ordered the right size on the internet but not sure which one to use while waiting for it to arrive, its took ages to find the problem I dont want to damage the air con

 

uf is the measurement of the capacitor which give you more power to start the fan (sort like you give it a push by hand). If the fan calls for a 2.5 capacitor, you should use 2.5 capacitor, but if the fan is new or in good shape, often it does not need that much of a push. little less push will do it. in your case, 2uf may be enough. So either 2 or 2.5 uf is fine now, you may need 2.5uf when the fan gets older.