a/c push button control w126
 

I have a problem which I believe is in the pbc (push button control) on my automatic control unit
The fan wont work sometimes, but if I lower the round temp to min it works, only to not work when set to a temp.
After moving the temp switch up and down and pushing the buttons and adjusting the fan setting from high to low and back to automatic I can get it to work on auto agian.
I have read the DYI section which describes the problem in the early 126, with poor connection between the temp control switch and also poor soldering points.
My question is if I pull the pbc out where and how do I start to improve the connections.
Thankyou Mark

Use a solder iron to heat the terminals and put a dab more of new solder on it.

I second that motion! Benzmac said it all. i fixed my climate control last weekend by doing the same as described above. although there is a 50% chance that this will solve your problem it is well worth it. why sped hundreds of dollars when you don't have to.
Good luck and keep us posted!
Adam

Thanks
 

Thanks for your support I will give it a go today and let you know how I get on,
Mark

fixed
 

I started with the main terminals on the thermo switch, resoldered them making sure to get a good contact to the curcuit board.
Then moved to the main curcuit board on the pbc resoldered any points that looked suspect, about thirty in all.
Re-installed it. Total job time about 35 minutes taking it slow and easy.
And Hey Presto. It worked beautifully.
Thanks everyone my most annoying problem gone.
HOOOOOORAAAAAAAY:D