Samsung DV448AEP, Service Manual

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30 _ Troubleshooting
No Problem What to do
4
Blows fuses or trips circuit
breaker
- Is the belt connected well?
- Is the winding of the motor continuous? (Rotor winding, stator winding, generator)
- Is the motor protector normal?
• If above points are not found, the PCB assembly is out of order. Replace it.
5
Blows fuses or trips circuit
breaker (Gas Model)
• During ignition the dryer will draw 6 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.
6 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.
7
Will Not Dry Gas Model Poor
Gas Ignition
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 (No.8, No.9, No.10)
8 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)
9 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)
10
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 Temps.
• Weak Hi-Limit
• Poor venting
• Bad drum seals
11
Improper drying clothes
wrinkled Rough texture long
dry time
• The lint filter is not clean.
• Any restriction in the exhaust.
• The outside exhaust hood damper door stuck closed.
• Is the exhaust too long, too many elbows, flex ductwork installed.
• Poor intake 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.
12 Noisy and/Or Vibration
• “Thumping” Check for loose tumbler baffle, rear tumbler roller(s) worn or misaligned, out-of-
round tumbler or high weld seam on tumbler.
• “Ticking” Check for loose wire harness or object caught in blower wheel area.
• Scraping Check for front or rear bulkhead felt seal out of position or worn tumbler front
bearings.
• “Roaring” Check for blower wheel rubbing on blower housing or bad motor bearings.
• Popping or squealing sound. Check for a sticky or frayed belt.