Purely a guess - either a poor solder joint ar small break in the PCB,  the cold would make the break contract and reconnect.  Would need to dismantle and then use magnifying glass to try and track down.  Can the manufacturer not sell a replacement remote?

I think you are all right, 1. buy another remote, 2. Pull it apart and look for problems, but the thermal thing seems to be correct.

Tried out in the sun full heat no response.

Tried to pull the remote apart but found that almost impossible to the point of nearly wrecking the thing.

How it got to the freezer solution I have no idea. Son was visiting so may have been his idea. He is a bit of a guru with electrics at times. Today may be the last time we turn it on for another year, maybe !!!!!!!!!!!!

A very strange one indeed.

Have fun Haji-Baba

There is always the option of installing a smart phone app to control the aircon
I have used one of these to play with the TV in the dentists :D

Depending on your phone and air con of course

https://play.google.com/store/apps/details?id=com.raon.aremotefreegalaxy

Hi Haji-Baba;

                  First off the problem is not uncommon with a lot of remote controls, that is they fail to work or be come intermitant. What happens is the buttons that are mainly used have a habit of failing first and each time you press a button ( power on, channel, volume up/down etc ). When you press the button what you are doing is bringing to contacts to gether that one make contact and tell the microprocessor in your remote controle what 'code' to send to the receiver in your air con. Some remote controls have a carbon contacts on the main board and under the button is another carbon pad that makes contact with the contacts in the remote control. After a while the carbon wears off and that is when you start to have intermittant problems with the remote control. Some of the better remote controls even have gold flashed contacts and this helps to a certain point even these will fail. Dust and dirt, spilt liquid or even the remote control being dropped can cause problems later on. A good reason why its a good idear to place your remote control in a clear plastic bag or even use glad wrap.

But what to do, well you could try and dismantle the remote, and as you have found out that can be hard to do without distroying the remote, Some remotes have had a very hard life and also have suffered from broken/poor solder joints ( as others have said ), but also can suffer from the cristal and/or the saw filter failing. What these do when they fail is to shift the frequency of the modulated IR light that is sent from your remote ( think of it like trying to lisen to a FM radio on say 104.9 Mhz but you can only tune your radio to 104.0. Close but not close enough ). On the other hand what can also happen is the receiver in your air conditioner may have failed ( gone deaf and has happened more than once ore twice ) or even a spider has built a web or even dust that has covered the 'eye' of the IR receiver.

In some cases I've seen these type of problems caused by fluroesant lights and some brands? of the compact versions have also been a problem.

What is the easyest way out of your delimmer. is to contact the manufacture and see if the remote controle is still available as a spair part, nower days most remote controls ( televisions, DVD's etc ) are quiet cheap. But a remote controle for your  air conditioner may be a nother thing all to gether.

 

 

 

 

 

 

-- Edited by valiant81 on Tuesday 2nd of February 2016 09:34:01 PM

Hard to operate buttons are usually caused by dirty button conductive surfaces, and contact foils. They can usually be cleaned with isopropyl alcohol, and the cause is mostly from an oily residue that is exuded by the rubberised button pad and sometimes spills. I have repaired literally 100's of them over the years.

But your problem is a bit different in that it works OK when cold, but not at room temp. I'd still go with the fractured joint or trace or at a very long stretch possible the crystal resonator.

valiant81 wrote:

---

Hi 03 troopy and every one else;

                                              Thanks for the reply and that is what I've been talking about, cleaning the contact does help to a point, but excess cleaning or even cleaning for the first time can remove what carbon there is left on the pcb or the rubber membrain and you can only make the problem even worce than before. Some time you are lucky and it will work for a short while, and then maybe fail again. I still say that the best way to fix a remote is to replace the remote control with a new one.

   

---

 If you use the wrong type of solvent, yes you will remove the carbon film. And I have even seen pcbs damaged, by the customer trying to remove it from the remote. I actually used to do the job a bit differently, by washing the remote board and keypad in warm soapy water before cleaning the pads and foils with isopropyl, and have done hundreds of them that way. In a couple of instances I have cleaned complete TV boards in soapy water too, before working on them. But they were TVs from the days when you could smoke inside the local Bowling club.

But, the OP's remote has a problem other than dirty button switches. So a new remote is probably his easiest fix, as long as it doesn't cost an arm and a leg. One TV remote I had in for repair was unrepairable and was over $300.00 for a new one.