Troubleshooting - Maytag NED7200TW Technical Information

Troubleshooting

To avoid risk of electrical shock, personal injury or death; disconnect power to dryer before servicing, unless
testing requires power.
Will Not Run
Will not start or run:
• All wires are hooked up to their corresponding
terminals.
• Dryer is plugged in.
• Blown fuse or circuit breaker.
• Door switch functional...door closed. Check for
diagnostic code 3.
• Start/Pause switch functional.
• Control Board operational.
• Drive motor functional.
• Check motor Winding Resistance: 2.88Ω between Pin
#3 and 4, 3.5Ω between Pin #4 and 5 are normal
status. (±5% 25°C basis)
Motor runs/ tumbler will not turn:
• Belt off or broken/damaged.
• Idler tension spring too weak or stretched.
• Idler pulley jammed or stuck.
Runs a few minutes and then stops:
• Lint buildup around drive motor.
• Low voltage present.
• Blower impeller blocked in blower housing.
• Drive motor - start switch contacts stuck closed.
Blows fuses or trips circuit breaker:
• The amperage readings are at 240 volts. One line
will be 24 amps and the other line will be 21 amps.
The neutral line will be at 3 amps. If the above
amperages are present, then the house wiring,
fuse box or circuit breaker should be suspect.
• Shorted heating element to housing.
• Incorrect wiring or a wire shorting to ground.
• Drive motor winding shorting to ground.
Gas Models
• During ignition the dryer will draw 8 amps. With the
burner ON, the dryer will draw 4.5 amps. If the dryer is
drawing amperages above this, then the house wiring,
fuse box or circuit breaker is suspected to be at fault.
• Igniter harness loose and shorted to base.
• Incorrect wiring or wire shorted to ground.
• Drive motor winding shorting to ground.
Will Not Dry
Will not heat (motor runs):
• Open heating element.
• Hi-Limit trips easily or is open.
• Regulating thermostat trips easily or is open.
• Membrane switch open.
• Check Thermistor.
WARNING
Will Not Dry(Gas Models)
Poor Gas lgnition
When the dryer is operated on a heat setting, the igniter
should be energized and burner shall fire within 45
seconds at 120 VAC. The failure of a component in this
system will usually be indicated by one of three
symptoms:
The igniter does not glow.
If the igniter does not heat up, remove power and using
an ohmmeter, check the following:
• Open flame sensor
• Open igniter
• Shorted booster coil
• Open wiring
• Bad motor switch (Neutral supply)
• No power from control (L1 supply)
Igniter glows - No gas ignition.
If the igniter heats up but the main burner flame is not
ignited, remove power and using an ohmmeter, check
the following:
• Open secondary coil
• Open holding coil
• Open wire harness
• Stuck flame sensor (Stuck closed)
The gas is ignited but the flame goes out.
If a normal ignition takes place and after a short while
the flame goes out, check for the following:
• Radiant sensor contacts opening prematurely
• Weak gas valve coil may open when stressed by higher
temperatures
• Weak Hi_Limit
• Poor venting
• Bad drum seals
Improper drying/clothes wrinkled/ rough
texture/long dry time:
• Lint filter is not clean.
• Restriction in exhaust.
• Outside exhaust hood damper door stuck closed.
• Exhaust too long, too many elbows, flex ductwork
installed.
• Poor makeup air available for the dryer.
• Incorrect tumbler speed. Tumbler belt slipping.
• Blower impeller bound; check for foreign material
in blower area.
• Customer overloading dryer.
• Check clothing labels for fabric content and cycle
selected.
• Clothes too wet due to insufficient spin out by
washer.
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W10162408