7 replies to this topic

[bosco]

could any one help me I have a ge refer  model # pss25ngmabb and I have no tech. sheet I want to know how to make it go into defrost?

[Pegi]

This refrigerator has a computer board, and this is not something you would want to be be testing.  Computer board, thermisters and defrost heaters and hi-limit thermostat are all in the defrost system.  There is no way to put this ref. into defrost, let it go thru the cycle and return to the cooling mode.  I would suggest you obtain professional help on this very difficult system.  Pegi

[i610288]

[user=533]Pegi[/user] wrote:

This refrigerator has a computer board, and this is not something you would want to be be testing.  Computer board, thermisters and defrost heaters and hi-limit thermostat are all in the defrost system.  There is no way to put this ref. into defrost, let it go thru the cycle and return to the cooling mode.  I would suggest you obtain professional help on this very difficult system.  Pegi

Hi Pegi, thanks for replying.The person who asked the question is my dad he's been doing appliance repair for 40 years, but almost all older stuff.The new board stuff is a different world to him, he rarely gets something like this in his shop.He knows all about thermisters and t-stats and heaters but generally there is a timer to turn to put in defrost.There are some boards where you hit the light switch 5 times or some where you turn the cold control on and off in certain sequence to engage defrost.But this one didn't have any tech sheet so he is cluless.Generally there is a way but you said there isn't.So how would the tech check it?:)

[Pegi]

Let me see if I can find the answer for you.  There is a way to test the board but will have to research another tech forum.  These ref.s are a joke, so much can go wrong and it just usually pot luck, throw parts at it till somethiong sticks that fixes it.  Usally start with testiing the heaters & thermisters..  If they check good the board is the last resort. But give me some time to find you some information..  :)

[i610288]

[user=533]Pegi[/user] wrote:

Let me see if I can find the answer for you.  There is a way to test the board but will have to research another tech forum.  These ref.s are a joke, so much can go wrong and it just usually pot luck, throw parts at it till somethiong sticks that fixes it.  Usally start with testiing the heaters & thermisters..  If they check good the board is the last resort. But give me some time to find you some information..  :)

Thanks Pegi.He's had it running for a few day's now and it seems to be fine.He just want's to be for sure before he let's it out to get sold.

[Pegi]

The best way to determine what has caused a non defrosting GE electronic control model is to first access the control board. Jump terminals line power to defrost, (J4 and J9). An amp probe should be placed on this jumper wire to determine current draw of the defrost circuit. A three amp draw is what is normal for this circuit. This will eliminate checking behind the evaporator cover to determine a defective heater or over temp device (defrost terminator). Note: This test is only to check the defrost cicuit. It does not initiate a defrost cycle. If the unit is in any other cycle than defrost, that cycle will continue to operate as well.

[i610288]

Thank you Pegi, I will let him know. 

[Pegi]

You are quite welcome.....;)