!!big Daikin Problem!! Codes,u4,pj, And E0

Hi Guys
Got a daikin A/C split with a indoor wall mounted unit (R410A). installed by another company:confused:.Never worked i got called in showing a fault U4. past experiance of a U4 code on the daikin means outdoor PCB. Checked outoor unit and LED A was not lighting which also indicates outoor pcb. Bought a new pcb and came with a capacitor which had to be added to the pcb. Changed the pcb but the fuse blew straight away. Discoverd mix up in wiring and sorted out wiring. then coming up code PJ as soon as i switched it on.I fitted the capacitor wire which came with the unit and now it is coming up with the code E0 as soon as i switch it on rang up daikin tech and they said to check all the safety devices to see if they all are sending 240v to the devices and 240v coming back. all fine except only 24v being sent and coming back to the low pressure device.the pcb is fine what do i do now??? PLEASE HELP

Your first fault code U4 Basically means the indoor unit is not communicating with the outdoor!. PJ means you have changed the PCB and not installed the capacity adapter with the new board. E0 means that one of the outdoor safetys have tripped. To help you anymore we would need the model numbers of the system.

i know the indoor model No is
FAQ71BUV1B

i will have to find the outdoor i have it written somewhere

the outdoor model No is
RR71B7V3B

thanks for the quick response

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Originally Posted by airconengineer

the outdoor model No is
RR71B7V3B

thanks for the quick response

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Single phase non-inverter compressor.

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U4 code on the daikin means outdoor PCB.

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Incorrect. U4 means that the indoor unit cannot communicate with the outdoor unit.

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Changed the pcb but the fuse blew straight away.

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Doh!

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the pcb is fine what do i do now

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:)

Are you now saying that the outdoor pcb LED is flashing (green one) and the U4 fault has gone? is the only fault code now EO?

Have you carefully checked the connectors on the new pcb (the grey ones)? Does the system run first then fault with EO or refuse to run?

If it refuses to run from cold and just shows an EO then I would suspect that you have got a wiring problem. Pull off the grey wire connectors and check for continuity (through the fan and compressor). If you have continuity here then it may be that the connectors are not seated correctly or are on the wrong pins :rolleyes:

yes the u4 fault has gone away now the problem is the EO code. and it refuses to run even in fan only mode the wiring is correct and im sure the pcb connectors are fine.

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and im sure the pcb connectors are fine.

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Sometimes you can't see the wood for the trees ;)

okay im certian.my main concern is only 24v being sent and coming back from the low pressure switch but the rest having 240v

The LP switch has nothing to do with an EO fault. An interuption to the 240 volt being sent out on one grey wire and back on the other will give an EO stoppage. Resetting the main power will, under normal circumstances, reset the EO fault and allow the system to run until it faults again. If you can't clear the fault then either, 1) you have a permanant open circuit through either the compressor or 2) through the fan motor, or 3) a wiring problem on the grey wires.
EO means - outdoor protection device activated.

thanks for responding.whats the best way of going about checking if theres an open ciruit on either of the three and once found how can it be fixed??

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Originally Posted by airconengineer

thanks for responding.whats the best way of going about checking if theres an open ciruit on either of the three and once found how can it be fixed??

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please don't, that poor Daikin has suffered enough -this is bordering upon cruelty ..

Call a real live 'airconengineer' who will sort it PDQ

Cheers

Richard

come on RB give the chap a chance:) life is also a learning process,we all were not born big,help him grow.:cool:

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Originally Posted by airconengineer

thanks for responding.whats the best way of going about checking if theres an open ciruit on either of the three and once found how can it be fixed??

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A mulitimeter, but then you would know that if you worked on air con.

Best talk to your local college and apply for a training course:)

Then equip yourself with the proper Diakin manuals (you can download them off the Diakin web site (link on the right hand side)

Get stuck in and learn there is no short cut to effort:)

Kind Regards Andy:)

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Originally Posted by airconengineer

thanks for responding.whats the best way of going about checking if theres an open ciruit on either of the three and once found how can it be fixed??

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Frank wrote

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Pull off the grey wire connectors and check for continuity (through the fan and compressor). If you have continuity here then it may be that the connectors are not seated correctly or are on the wrong pins :rolleyes:

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thanks for the lecture ladshttp://www.refrigeration-engineer.co...ons/icon12.gif. i know how to use a multimeter so rest assuredhttp://www.refrigeration-engineer.co...cons/icon7.gif. i was thinkin more in the lines of being able to override the device to test which one of the three is broken http://www.refrigeration-engineer.co...cons/icon5.gif

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Originally Posted by airconengineer

thanks for the lecture ladshttp://www.refrigeration-engineer.co...ons/icon12.gif. i know how to use a multimeter so rest assuredhttp://www.refrigeration-engineer.co...cons/icon7.gif. i was thinkin more in the lines of being able to override the device to test which one of the three is broken http://www.refrigeration-engineer.co...cons/icon5.gif

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Frank wrote

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An interuption to the 240 volt being sent out on one grey wire and back on the other will give an EO stoppage.

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All the clues are there - you're just not reading them :rolleyes:

ive written previously about that

"my main concern is only 24v being sent and coming back from the low pressure switch but the rest having 240v"
http://www.refrigeration-engineer.co...ons/icon14.gif

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my main concern is only 24v being sent and coming back from the low pressure switch

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The LP switch has nothing to do with an EO fault.

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More indication of a wiring problem

GREY WIRES = EO Fault

I have checked the wiring twice. i rekon the people who installed it wired it wrong, started it up,made a bang, corrected the wires and when it didnt work they ran home to watch the world cup.

you think this is a possibilty

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I have checked the wiring twice

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What about continuity? Did you check this?

sounds like compressor, capacitors or fan motor to me

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Originally Posted by cooldude

sounds like compressor, capacitors or fan motor to me

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Nothing like casting your Net wide is there? :D