heating problem

[oscar333]

I have a Maytag Neptune dryer when I turn it on it will heat for a very short time and get slightly warm but wont heat properly. I have changed the bias t-stat still doing the same thing any ideas thanks
                                                        Oscar

Model mde6700ayw

[Repair-man]

Oscar, remember the basics...if the vent is restricted or there is poor airflow for some reason, the heater will trip out on hi-limit as a precaution. In most complaints regarding poor heating this is the  case. Also try running the dryer with the vent completely disconnected to see what temperatures you read from the rear exhaust outlet during operation. That's what we do in the field first!

This is the electric model, right?

Here's the service manual:

27" Dryers-Maytag

[oscar333]

Thanks repairman the air flow is fine and the air temp reading at the exhaust vent at dryer is about 108 degrees Fahrenheit it is an electric unit.
                                  Oscar

[Repair-man]

Most techs would then check voltage at the heater terminals, looking for a constant 240 volts during the heating process. 108 degrees indicates the element may not be getting proper voltage or may be defective. If the voltage drops out after a few minutes then move on to the next component in the circuit (hi-limit, i.e.) to find where the voltage is being interrupted.  Use the above manual to help you see the components involved in the heat circuit.

[krazytech]

I agree, 108 is not Hot enough .. should be 140f to 160f...if power is OK...also check the element I had one that broken and welded itshelf back together with only half the element was working...one that you will never forget...

[oscar333]

Just wondering how do I properly check the voltage at the heater because I have to have unit apart to get at the heater and if I do this it wont get proper air flow through the unit causing the high limit t stat to heat up and cut the heater out

[Repair-man]

You check power to the heater from the main PCB inside the top panel on the left side. This requires that you whip out the schematic and find the red power wire from the board to the heater. The board is marked as to the components it serves and so is the wiring diagram on the unit. You would physically have to open the unit and pull the heater coil to inspect it for defects as Krazy described. If the heater is intact, you can assume one of the other components, such as the board itself or the  hi limit thermostat is at fault.

The PCB reacts directly from input received from the drum dryness sensor and thermister.

[oscar333]

Thanks for your help you guys are very knowledgeable and very helpful thanks again
                                          Oscar