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What does F70 mean on a front load dryer?

Dryer stopped and started flashing F70 and will not come back on

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Hello Carol;

My name is Peter. I am a retired field service appliance technician.

F70:

No communication between the electronic control board and the user interface control board assemblies.

Unplug the dryer. Check the wire harness connections between the main electronic control board and the user interface control board assemblies. If the connections are sound, have a technician diagnose the cause of the communication failure. The main electronic control board and/or the user interface control assemblies might need to be replaced.

Posted on Dec 07, 2014

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Replaced all control boards in kenmore elite dryer and still get f70 code


ok i copied and pasted this...but its good info...



F70 = Overheating sensed causing dryer stop until temperature reaches(drops) below set level - determined by manufacturer

Can be caused by different contributing factors;

1. poor airflow

2. blocked air flow screen inside tumbler

3. clogged lint screen

4. slow tumbler (low revolutions)

NOTE;

Ironically, the fourth factor has been lurking behind the popular discussions on this problem that has exhibited itself on both the whirlpool and Kenmore products with the main triage to have included inspection of the electrical connections made by the installer.

These electrical connections not followed properly with accordance to '4prong' NEMA 14-30R (30amp, 2-phase circuit outlet) with separate ground and neutral posts, as exhibited in the standard dryer installation manual, will cause your tumbler to run slow. Hence, the 4th factor which caused the 'F70' code stops the dryer from operating.

Now, you have corrected the wiring as necessary and eagerly place some stuff's in there and all seems well. But as soon as you place something large and wet (HEAVY/BUNDLE), you get the error code again, you thought you had it!

Okay, this is what you need to do;

1. make sure your air flow is adequate by really cleaning the duct (I stuck my hand through the wall duct and scraped off old hard lint that can collect humidity & even cut my finger). Also make sure your vent hose does not have any unnecessary elbows or squiggles in it ( I had an elbow/pan type and it is not good as the heat seems to reflect too much ). KEEP IT AS SHORT AS POSSIBLE - I KNOW IT'S HARD, BUT IT IS NECESSARY.

2. Refrain from using too many softener sheets as they can & will restrict the air flow screen inside the tumbler.

3. Make sure your lint screen is clean - wash it periodically as lint particles collect moisture and this in turn raised humidity.

4. Once you have verified your electrical connections as stated earlier in this posting, run a normal cycle with towels or something of the like so as to reset the sensors in the dryer.
.

THE MAIN THING TO REMEMBER IS THAT 'F70' SEEMS TO BE THERE TO PROTECT AGAINST OVERHEATING WHICH IN TURN CAN TURN TO A FIRE HAZARD!

The tech sheet kindly provided by a member on another forum shows F70 as a control board issue as noted in this thread.

So what did I do so far:
Opened the top and back panel and thoroughly cleaned the lint. I did not however ,think that the lint was excessive as to cause motor malfunction. I also unhooked the dryer from exhaust and ran three loads and they all dreed without the error. Now it is possible that removal of lint did the trick but it looks like the venting issue as suggested in one of the replies has some credence. next I will hook the dryer back to wall exhaust and run a few loads. if the error returns I will focus on venting.
The main question that I am asking myself is that if the control boards are at the heat of issue would it possible to do any loads without the error. Your comments and suggestions are very welcome.
I hope all this works ends up in a running dryer and helps other people struggling with the same problem.



Read more: http://forum.appliancepartspros.com/dryer-repair/51757-kenmore-dryer-error-code-f70.html#ixzz2565WTerU
http://forum.appliancepartspros.com

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What does F70 flashing mean?


The F70 is an internal control problem. It can be caused by a failed central control board or an interface problem. The way to determine which part is bad when the error occurs is as follows:

  • If the error occurs when the machine is running then the problem is the interface.
  • If the error occurs when the washer is not running the problem is the central control unit.

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The F70 error apparently is a design flaw that happens to many of these machines in this series. It has something to do with a failure of the components to communicate with each other. The main circuit board most likely needs to be replaced hope this helps

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F70 = Overheating sensed causing dryer stop until temperature reaches(drops) below set level - determined by manufacturer
Can be caused by different contributing factors;
1. poor airflow
2. blocked air flow screen inside tumbler
3. clogged lint screen
4. slow tumbler (low revolutions)
NOTE;
Ironically, the fourth factor has been lurking behind the popular discussions on this problem that has exhibited itself on both the whirlpool and kenmore products with the main triage to have included inspection of the electrical connections made by the installer.
These electrical connections not followed properly with accordance to '4prong' NEMA 14-30R (30amp, 2-phase circuit outlet) with separate ground and neutral posts, as exhibited in the standard dryer installation manual, will cause your tumbler to run slow. Hence, the 4th factor which caused the 'F70' code stops the dryer from operating.
Now, you have corrected the wiring as necessary and eagerly place some stuff's in there and all seems well. But as soon as you place something large and wet (HEAVY/BUNDLE), you get the error code again, Geeeezzzzz, you thought you had it!
Okay, this is what you need to do;
1. make sure your air flow is adequate by really cleaning the duct (I stuck my hand through the wall duct and scraped off old hard lint that can collect humidity & even cut my finger). Also make sure your vent hose does not have any unnecessary elbows or squiggles in it ( I had an elbow/pan type and it is not good as the heat seems to reflect too much ). KEEP IT AS SHORT AS POSSIBLE - I KNOW IT'S HARD, BUT IT IS NECESSARY.
2. Refrain from using too many softener sheets as they can & will restrict the air flow screen inside the tumbler.
3. Make sure your lint screen is clean - wash it periodically as lint particles collect moisture and this in turn raised humidity.
4. Once you have verified your electrical connections as stated earlier in this posting, run a normal cycle with towels or something of the like so as to reset the sensors in the dryer.
What my wife keeps doing is to put a back in after it's Heavy Buncle cycle (because it's not fluffy) and the dryer start up with high heat and then senses over heat and then SHE GET'S THE FAMOUS F70. In cases like this, use the damp dry selection and that works great - or better yet just use the timed dry selection with low heat.
We just have to understand that someone sat down and figured out what and how they wanted to program the computer that determines how this particular machine is going to react.
THE MAIN THING TO REMEMBER IS THAT 'F70' SEEMS TO BE THERE TO PROTECT AGAINST OVERHEATING WHICH IN TURN CAN TURN TO A FIRE HAZARD!

Thanks for using FixYa - a 4 THUMBS rating is appreciated for answering your FREE question.

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F70 = Overheating sensed causing dryer stop until temperature reaches(drops) below set level - determined by manufacturer
Can be caused by different contributing factors;
1. poor airflow
2. blocked air flow screen inside tumbler
3. clogged lint screen
4. slow tumbler (low revolutions)
NOTE;
Ironically, the fourth factor has been lurking behind the popular discussions on this problem that has exhibited itself on both the whirlpool and kenmore products with the main triage to have included inspection of the electrical connections made by the installer.
These electrical connections not followed properly with accordance to '4prong' NEMA 14-30R (30amp, 2-phase circuit outlet) with separate ground and neutral posts, as exhibited in the standard dryer installation manual, will cause your tumbler to run slow. Hence, the 4th factor which caused the 'F70' code stops the dryer from operating.
Now, you have corrected the wiring as necessary and eagerly place some stuff's in there and all seems well. But as soon as you place something large and wet (HEAVY/BUNDLE), you get the error code again, Geeeezzzzz, you thought you had it!
Okay, this is what you need to do;
1. make sure your air flow is adequate by really cleaning the duct (I stuck my hand through the wall duct and scraped off old hard lint that can collect humidity & even cut my finger). Also make sure your vent hose does not have any unnecessary elbows or squiggles in it ( I had an elbow/pan type and it is not good as the heat seems to reflect too much ). KEEP IT AS SHORT AS POSSIBLE - I KNOW IT'S HARD, BUT IT IS NECESSARY.
2. Refrain from using too many softener sheets as they can & will restrict the air flow screen inside the tumbler.
3. Make sure your lint screen is clean - wash it periodically as lint particles collect moisture and this in turn raised humidity.
4. Once you have verified your electrical connections as stated earlier in this posting, run a normal cycle with towels or something of the like so as to reset the sensors in the dryer.
What my wife keeps doing is to put a back in after it's Heavy Buncle cycle (because it's not fluffy) and the dryer start up with high heat and then senses over heat and then SHE GET'S THE FAMOUS F70. In cases like this, use the damp dry selection and that works great - or better yet just use the timed dry selection with low heat.
We just have to understand that someone sat down and figured out what and how they wanted to program the computer that determines how this particular machine is going to react.
THE MAIN THING TO REMEMBER IS THAT 'F70' SEEMS TO BE THERE TO PROTECT AGAINST OVERHEATING WHICH IN TURN CAN TURN TO A FIRE HAZARD!

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If a loose connection is not found, the controller board will probably need to be replaced.

Please report back here what you find, OK?

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