AC troubleshooting OTP Error

[bearded_bluto]

One of my split air conditioners has stopped working. Rather then troubleshooting a bunch I just threw a new mainboard into it. Then I swapped out both indoor and outdoor boards with a identical ac unit in the home. Then I thought maybe its the eeprom unit, so I bought the eeprom chip for 200 baht and put it into the socket so it would upload. The board seems like its only interested in flashing the error led lights. The error code flashing on the outdoor unit translates to OTP Error.

 

From the manual:

1.Checklist :
1) Is there a short around micom?
2) Is there a short around IC502?
3) Did you download or insert EEPROM IC, after changing outdoor PBA?

 

The manual says check for shorts somewhere. I did get a good shock on the ladder doing my usual short cut stuff hot dogging it while handling the main  board outside. I don't have the equipment to recapture the gas, I do and can fill refrigerant or if I could get the compressor to turn on I can do a pump down in order to relocate the indoor unit. I'm just saying that incase its some sensor on the compressor. I could not change that.

 

This is a Samsung ASV10PUM model. The boards are good I think since I put working boards from a different ac. The compressor does not turn on and the error flashing on outdoor unit is OTP Error. I have invested about 5-6k baht in my usually guessing. I don't really want to spend 8 more hours with a multimeter on a ladder with more guessing, plus I am finding it difficult to find a AC repair guy to come out to the villages. They seem only interested for new installs.

 

Anyone have any guesses or suggestions? The electrical parts lists IC502 as: SOCKET-IC;8P,SN,2.54mm, i believe that is the empty eeprom socket that I can put a chip in to reupload the instructions. I did try that to recap. Is this a sensor problem? Would a compressor that had a overheated cause this?

 

One thing I do not like about this AC is that the wire terminals for the mains are not clear. There are 3 terminals and the markings are | N(1) | 1 | 2 | That is confusing to me, also the unit is not grounded, that does not surprise me.
 

[OneMoreFarang]

42 minutes ago, bearded_bluto said:

Rather then troubleshooting a bunch I just threw a new mainboard into it. Then I swapped out both indoor and outdoor boards with a identical ac unit in the home. Then I thought maybe its the eeprom unit, so I bought the eeprom chip for 200 baht and put it into the socket so it would upload.

How many guys in this forum do you think would have done that or even understand what you did? I guess not many.

At this stage maybe try a specialist forum.

Maybe something like this:

Hot Questions - Stack Exchange

 

[bearded_bluto]

Ah

Sacred secret knowledge of the HVAC guys. Their first reply from a HVAC (not stack exchange) is always 'Aye toni got a license for that?' lol

 

In retrospect your right.

[HauptmannUK]

You seem to have adopted a 'poke and hope' approach to solving this problem.

In general the electronics are pretty reliable and e.g. EEPROMs don't fail unless there is some external cause (water, insects etc).

I would normally check out the rotating electrics and sensors first, since they are more likely to fail. These AC units have rotation sensors on compressor and fans - the unit will not run if it senses no rotation. Also there are temperature and gas pressure sensors......

[Fruit Trader]

If the OTP code suggests EEPROM error, this can be generated if the EEPROM itself is faulty or from a fault on the mother board preventing the main CPU from communicating with the EEPROM IC.

 

Firing the parts cannon at faulty units that use EEPROM to store options and model codes will very likely fail and end with either the indoor or outdoor unit unable to validate its components.

 

Authorised Samsung service technicians use set procedures and diagnostic tools to find faults on these units. A central tech support provides data files for EEPROM programming based on serial number.   

 

Cut your losses and call Samsung service. 

[bearded_bluto]

I poked around again today, I guessed maybe there could be induction on the "communication wire". nope. The plan is to try and get a tech guy to come out tomorrow. If not...

 

I guess I will just buy another split if I cant proceed, and make sure to have the new installation guy bring a recovery machine out. I'll just give this unit away or try to sell it to the new install guy.

 

Any advice on something other than Samsung. I heard Daikin is good. I would like to find one that is:

 

--Super easy to clean- I mean being able to pull out the long tubular blower fan in less then 5 minutes, no crazy panel plastic clips that break off either. Able to wipe the drain tray and the area behind the blower fan.

--Plastics that do not turn yellow when it sees a bit of sunlight. 

--KISS - Simple with the same model used for a few years so you know you can find parts in the future. So tired of disposable appliances.

--Documented - schematics, part lists - not hidden away behind paywalls or for technicians only, Wire terminals that are clearly marked L | N | G | Sensor | Etc...

 

This AC does not come close to those 4 things.

Who here knows of such a split air machine? I did see a solar powered one made in Thailand I believe. Sounds really nice, and I believe its a cassette type. According to the website you can have it only hooked up to 6 or 7 panels (included I think) and the machine will turn off and on when voltage crosses thresholds. Seems nice not having to loose power converting AC to DC. Thoughts?

 

Thanks for all the replies so far.