Question about Hotpoint NVL333GY Gas Dryer

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My wife brought a Hotpoint gas dryer into our marriage, which we didn't use for the last 4 years because we were renting a house. Now we have our own home, and the dryer is hooked up for gas and venting, but I can't figure out how to light the pilot (I assume there is one). The gas line is open (tap handle parallel with pipe) and the power is on. I have removed the plate at rear lower right, but I can't see a pilot in the recessed slot, or hear any gas going through. How does this thing work?

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Hi. I am assuming that you have selected the correct model number when posting your question. At the top of this page, it says that the your unit in question is a Hotpoint NVL333GY. If this is not your model, please post the entire correct model number, asap. This is a very important issue that can greatly affect the accuracy off the solution.

With that said; This particular model of Hotpoint dryers are not equipped with a "traditional" pilot light configuration. This unit is equipped with a booster coil assembly and glow ignitor. The glow ignitor is basically your lighting apparatus and the coils open and close the gas valve, with the help from a few monitoring thermostats and the main control board or timer mechanism. If you have power going to the unit and gas is on, you should be able to start the cycle by selecting a drying cycle with the timer dial and pushing the start button. If the dryer dose not respond, or if the drum turns without any heat, this will be the result of a failing burner assembly(coil damage or ignitor failure) or the timer and monitoring thermostats/fuses maybe suspect.

Click here to view a exploded diagram of the burner assembly in this model.

The flame sensor is labeled number 1379
The ignitor is labeled 1374
The coil assembly will be labeled 1372 and 1371(Boost and secondary coil are mounted together)
The burner is labeled number 1377
The actual valve is labeled number 1370

All the parts above make up your burner assembly, in this particular model.

Here is a basic summary on how these dryers work.

The dryer uses multiple thermostats to regulate the temperature. When the temperature is higher than the preset limit of a particular thermostat, the thermostat breaks the circuit and the heater goes off. When the temperature cools enough, the thermostat closes the circuit again and the heat can come on.Most dryers have a choice of temperature settings, therefore a separate thermostat is used for each setting. The selector switch or timer control then routes the circuit through the appropriate thermostat.

If a thermostat fails, it may prevent the heat from coming on, This happens because the thermostat does not close the circuit when the temperature falls below the operating temperature of the switch. It is a simple matter to test a thermostat; it should show continuity when the switch is cool and no continuity when it is warmer than its rated temperature.A thermostat can also fail by being always on, no matter what the temperature. This switch would show continuity whether it was hot or cold. In this case, the heater would not shut off and the the dryer could dangerously overheat. As a safety precaution a second thermostat is used, This is called a thermal fuse. The power will be cut to the heating circuit if the maximum safe temperature is exceeded. In most cases, this is a one time fuse. The heater circuit will not function until the fuse has been replaced. Of course, it will be necessary to determine and repair the underlying cause of overheating or the fuse will just cut out again. The most common cause of overheating will be a clogged ventilation assembly. Be sure to inspect the entire ventilation assembly for build up. This will cause issues, if obstructions exist.

The thermostats are usually grouped together. The are typically oval in shape and about an inch and a half in size. They may be on the blower housing, under the lint trap or inside the vent line. There should be two wires connected to each thermostat.

Label the wires and connections so that you can properly reconnect them later. The wires are connected with slip on connectors. Firmly pull the connectors off of the terminals. You may need to use a pair of needle-nose pliers to remove the connectors. Inspect the connectors and the terminals for corrosion. If either is corroded they should be cleaned or replaced.

To test the thermostats or fuse, set the multimeter to the ohms setting X1. Touch one probe to each terminal. You should get a reading of either zero or infinity. At room temperature, the thermostats should have a reading of zero. When the thermostats are heated to their limit temperature, they should switch off and you should get a reading of infinity. The fuse should be tested at room temperature for continuity.

Burner assembly inspection:

On the gas valve are one or two coils (solenoids) used to open and close the valve to control the flow of gas. If a coil fails, gas will not flow and the dryer will have no heat.

The easiest way to diagnose a problem in the burner assembly is to observe the burner operation. Remove the small access panel at the bottom, front of the dryer, select a high temperature setting and start the appliance. Watch the burner assembly, shortly after starting the dryer the ignitor should begin to glow. Next you should hear the click of the gas valve coil and a flame should ignite. The flame should be mostly blue and it should remain on for a minute or more.

If the ignitor glows for several seconds (up to 15 seconds) and then goes out, the problem is probably the coils (solenoids). If the ignitor glows and stays on, then the problem is usually the flame sensor. If it ignites and then quickly goes out, it is most likely a problem with inadequate air flow.Test the coil for resistance using a multimeter. Set the multimeter to the ohms setting X10. Place a probe on each terminal. The multimeter should change from a reading of infinity to roughly 1300 ohms (+/- 150 ohms) when the probes touch the terminals. If the reading is infinity or substantially different from 1300 ohms, the solenoid should be replaced.

Posted on Aug 06, 2010

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