On 23/07/2016 10:18 PM, Mr Sandman wrote:


"Rheilly Phoull" wrote in message
...

On 23/07/2016 3:18 PM, Mr Sandman wrote:
Hi all,

I have an aircon unit that failed. Fault code 'PU' says the capacitor
charging circuit failed, this is confirmed by checking the voltage at
the three large electrolytic caps which show 43vdc, but oddly 85v ac.
The expected voltage at the capacitors should be 180-380vac.

I am a low level electronics experience chap, so need some advice on how
these caps would typically be charged.

They are used, as i understand it, to smooth the supply to the variable
speed fan and compressor in the aircon unit.

Looking at the other test points on main pcb, everything else checks out
ok.

Here is a link to the (large) manual for the aircon unit if any one
fancies helping me out.

http://www.manualslib.com/download/8...Ash-18aie.html

Id apreciate any help/guidance,

Many thanks,

Steve

You have worked through the logic of the trouble shooting guide for the
charge failure ??

yes i have, i went through the tests for main board, the only test that
was wrong was test three, giving readings i mentioned.

There is no further troubleshooting that would identify the component
that is faulty as i could see in the manual.

cheers

steve


So as Phil says, you should be checking for DC at the caps and if that
is only 43vdc then the fault is in the charging board. Are you intending
to repair the board or replace it?