How to reset a call c6400?

Hi
I found this explanation of your error, although my understanding of it is not entirely clear.
Code: C6400
Description: Zero-cross signal error
Interrupt of the zero-cross signal does not occur more than 1 s.
Causes: Poor contact in the connector terminals.
Defective power source PWB.
Defective engine PWB
You can find this here:
Error Codes Kyocera Mita TASKalfa 221 Code C6400
and also by changing the drop down menus along the top of the page you can view other errors for your machine and for other models and makes. You can also use the link to get a Service Manual for your machine.
Hope this is helpful, if so would you please register that with Fixya
Cheers

C6400 Means that there is a communication problem between the circuit boards.
Check that the cable from the document feeder(on top of the machine) at the back is screwed in tightly.
Try powering off the machine at the wall for 30 minutes then turn back on.

A couple of things could of happened here;

1. Most common issue I see is customers do not reset the brakers right. A GFCI braker, when tripped, must be switch all the way to the off position then back to on. When a GFCI braker is tripped it looks to already be in the off position.

2. Check your system fuse. You can check for continuity or if you check the voltage, putting a lead on each side of the fuse while it's installed, it should read 0 voltage if it is good. If it reads 120vt replace it. You can get them at home depot or lowes for less than $20.00

3. You shorted out the circuit board using a magnetic tip screw driver. It happens.

4. You bought a rebuild board from e-bay. In this case if the seller quits responding contact paypal.

C6400 is a fixing unit error.

To reset -

Try this, enter "10871087" from keypad, You should now be in maintenance mode.
Enter "163"press "Start / Print" key.

You should see a screen that says "Execute".

Cursor / highlight "Execute".

Press "Start / Print key.

The machine will turn off and should come back to ready. If not then you need to replace the fixing unit.

I hope this is helpful,
Shawn

You will have to call a Copystar or Kyocera technician to reset your fuser memory.

On the back, there may be a red push button to reset. where the dryer has overheated. If the heating element is only heating on a soft dry, wollens, etc, the element needs replacing. Keep checking your lint filter after every dr, to prevent a reset situation. Hope it helps, Regards Dave.

Defective power supply board. or Defective engine board

you probably got hit by a surge... try the best solution on this page...

I’m happy to assist further over the phone at https://www.6ya.com/expert/norman_d2fa496dce30c65d

you have a fuser problem, burnt out heater lamp needs to be replaced. call service representative for parts

You have this listed under "Front Load Washer" and don't explain which type of of dryer you have (Gas or Electric). I'm assuming this is an ELECTRIC dryer, since you mentioned a thermistor. The following link will explain how to troubleshoot your dryer no heat problem:

http://www.fixya.com/support/r630242-dryer_runs_but_not_heat

The symptoms of a dryer no heat problem are, the dryer drum will still spin, the blower fan runs, and all indicators function, but the dryer does no heat. If this is the problem you are encountering, then the link I provided for you should help you find your cause.

The first step to troubleshooting this problem is to check the voltage at the wall receptacle across the two hot leads (the two large slots in the receptacle - each leg to neutral reads 110-120VAC). A reading across the two hot leads should yield 220-224 VAC. If the voltage is incorrect, this can cause the heating circuits to fail, but allow everything else to work. I have seen where one leg of the 220VAC circuit is tripped or not working at all and causes the wall receptacle to read 1/2 the normal voltage that is required. This could be a problem with the circuit breaker panel or wiring in the wall receptacle. The heating circuits require 220VAC to operate, while the controls and drive motor only use 110-120VAC. If the voltage is correct at the wall, check the voltage at the terminal block in the back of the dryer. This is where the power cord attaches. If the voltage is correct at the terminal block, the problem is in the heating circuits. If the voltage is not correct at the terminal block, you may have a bad power cord.

NOTE: Please ensure you UNPLUG the dryer when replacing any internal components. Dangerous voltages are still present with the unit turned off.

Now...what controls the heating circuit in a Whirlpool manufactured dryer is the Thermal Cut-Out (TCO), the Hi-Limit Thermostat and the Heating Element. I'm assuming you replaced the TCO(?). If you did, it is recommended that you replace the TCO along with the Hi-Limit Thermostat. Failure to do so can result in premature failure of components you may have already replaced.

The link I provided explains all this. Please read through the information I provided and let me know if you have questions. If you require further assistance, please let me know before you rate the solution. I hope this helps you resolve your problem.