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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Very thorough answer. Even a layman like myself understood, even though I will have to hire someone to do the work, at least I will know what is going on. Thanks!
I believe F70 for the 3000 series Maytag dryer is an "overheating" issue (as stated here) - some other answers I've seen online indicate a communications error between control boards. Anyway, I had the same issue with my dryer where it would not work at all on "Normal" and would only run a few minutes (5 or so) on "Timed" before a restart was required. I checked my lint basket, dryer exhaust hose and roof vent - all appeared to be clear, i.e., no obvious blockage. The dryer body did seem to be fairly hot though. I bought a new dryer exhaust hose and routed it out my side door to the outside (no obstructions) to see if it would work. It did, even on Normal. When I put the new hose on, I noticed that the dryer exhaust pipe is removable (it is about 16" - 18" long). I removed it (exhaust pipe) to more easily put the exhaust hose on with the hose clamp. I looked inside the vent area and could not believe all the lint that was collecting there inside the dryer. I came to realize that my exhaust pipe was not fully inserted into the dryer (the last 2 or so inches on the inserted end connect the exhaust from the drum area, through the back of the dryer body, and out to the exhaust hose. I cleaned out the stray lint, re-inserted the exhaust hose and pipe into the dryer, and re-connected the hose to the roof vent and it has worked fine ever since. When fully inserted, the exhaust pipe should only extend 1-2" from the dryer body. There should also be a clip next to the hole where the exhaust pipe penetrates the outer dryer body. This clip slips over a ridge on the exhaust pipe when it is fully inserted and helps keep it in place and fully inserted. Bottom line...believe your indications. F70 indicates "Overheating"...I had "Overheating". We now notice much more lint collecting in the lint screen. Unplug dryer before reaching in to clean out the “stray” lint-there are some wires and relays in that area. On another note, I am very happy with the new exhaust hose I bought from home depot as it is very flexible, tear resistant, and somewhat insulated.
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