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GE Wall Oven: Display says "BAKE" but relays won't engage

Posted by Samurai Appliance Repair Man, in Oven-Range-Stove Repair 07 June 2013 · 610 views
wall oven, GE
Here's another tasty and expeditious troubleshooting tip from our friends at FixYourBoard.com, offering top quality control board re-building, specializing in bringing NLA control boards back from the dead. Here's something to watch out for when troubleshooting GE wall ovens. Same trick may apply to other brands and models.

GE Wall Oven: Display says "BAKE" but relays won't engage.

From our tech support conversation:
Tech Support: Is the door closed or open?
Tech: Closed.

.... long conversation with measurements etc ...

Tech Support: I'd like to verify the functionality of the plunger switch on the door. Can you locate it?
Tech: Yes, that's what I'm holding in to "close the door".

.... Ka-Ching! ... Nooo!!!

Tech Support: Please physically close the door and try again.
Tech: The oven is heating!


TIME SAVING TIP ABOUT GE WALL OVEN:

If the control board thinks the door is open it prevents the heating element relays from engaging.
This is completely determined by the state of the 2 micro-switches in the LATCH MECHANISM.
(To cook switch #2 (top) MUST BE CLOSED, switch #1 (bottom) MUST BE OPEN)
The oven controller DOES NOT SENSE the PLUNGER switch!

Remember this to save wild geese. :woot:



Source: GE Wall Oven: Display says "BAKE" but relays won't engage.


How to Replace a Radiant Burner in a Jenn-Air Glass Electric Cooktop

Posted by Samurai Appliance Repair Man, in Oven-Range-Stove Repair 20 February 2013 · 988 views
Jenn-Air, jennair, cook-top and 1 more...

from the service manual:

Main Top Removal
1. Disconnect power to cooktop.
2 Remove cooktop from installation position and place face down on protected surface.
3. Remove screws securing main top to burner box bottom.
4. Remove screws securing control panel box and conduit mounting plate to burner box assembly.
5. Remove main top.
6. Reverse procedure to reassemble, verifying that cooktop frame is properly aligned.
NOTE: Make sure the pieces of insulation, located in the front left and right rear corners,
are put back in place.
Failure to do so could create excessive cabinet temperatures.
Posted Image



Part link for the replacement burner ==> http://www.repaircli...mber=JEC0536ADB

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To learn more about your cooktop or to order parts, click here.


Source: JennAir Glass Cook Top Model# JEC0536ADB, Replacing Burner, How to Remove Top?


Orifice Size Code Markings for LG Gas Stove Burners

Posted by Samurai Appliance Repair Man, in Oven-Range-Stove Repair 15 January 2013 · 1,073 views
gas, stove, burners
The orifice hoods are the little brass hoods that screw down on the gas jet that supplied the stove burners in a gas stove. Their purpose is to meter the correct amount of gas into the air-fule mixture that gets ignited at the burner ring. The diameters of the orifice vary with the BTU rating of the burner and the type of fuel being burned. Professor john63 provides us this handy listing of orifice metering hood size codes for LG gas cooktops and ranges:



Orifice size is determined by a letter stamped onto the orifice:

NATURAL GAS

LF: C
LR: D
RR: G
RF: H
CTR: D
BROIL: A
BAKE: B

LP GAS

LF: L
LR: M
RR: P
RF: Q
CTR: M
BROIL: D
BAKE: F




Source: LG Center Burners


Theory of Operation of Electrode Gas Flame Detection

Posted by Samurai Appliance Repair Man, in Oven-Range-Stove Repair 10 January 2013 · 841 views
gas, stove, burner, ignition and 2 more...
If you're working on a gas stove where the burners keep clicking even after the flame is established, you may be tempted to throw a new spark module at it and hope for the best. But you would probably be disappointed. Let's start the troubleshooting process with a fundamental understanding of how the spark module is supposed to detect that the burner has established a flame:

Come with me now on a wild romp through the theory of operation of electrode gas flame detection...

If you look closely at a finger of burner flame you will see that it is clearly made up of three separate elements: 1. Inner fuel rich cone 2. Ionized blue outer cone with current carrying capabilities and 3. Outer air rich mantle. When gas combined with air; burned energy is released in the form of heat and light. When the gas / air mixture is controlled, the outer blue cone will actually carry electrical current similar to a wire.

If we place a metal probe into this “Ionized Plume” and apply a voltage between it and the burner, current will flow. An important characteristic of a burner/flame/electrode assembly is its ability to mainly pass current in one direction. It behaves as a one way valve or rectifier.

Flame Rectification systems make use of this directional characteristic when detecting a good flame to distinguish it from leakage currents that can arise due to moisture contamination, soiled igniter tip, poorly grounded burner spreader ring / burner head, cracked igniter insulation or poor house ground.

An AC voltage is applied to the electrode from the spark module and the resultant current flow which is greater in one direction than the other, is electronically detected. This current is very small, about one microamp (one millionth of an amp).

The minimum recommended flame current measured under all likely conditions in an installation should be 1.0 microamps for re-igniters. When a burner flame is present the Ionized outer cone will be producing a small DC current. This current is known as Flame Current. The flame current has to be at a certain level to allow voltage from the spark module to flow efficiently.

The accurate placing of the electrode in the flame is important. This igniter tip needs to be perfectly located in the ionized outer blue cone to effectively send and then detect current flow.

To break it down further, the spark module acts as a simple capacitor. It saves voltage like a sponge until it can hold no more. It will save and release this voltage approximately 3 times per second. When the voltage is released it follows the spark wire until reaches the spark electrode tip. The built up voltage wants to leave the tip and move to the point of least resistance. In a healthy situation this will be the burner spreader ring. From the burner spreader ring the voltage flow will pass through the burner head, burner tube, chassis and to ground. An interruption of this current path will cause the spark system to misbehave, such as with the continuous clicking problem.



Source: G.E. ZGU36L6H4SS Cooktop


How to Change Out a Hidden Bake Element in Maytag Electric Range

Posted by Samurai Appliance Repair Man, in Oven-Range-Stove Repair 09 January 2013 · 836 views
maytag, oven, bake, element
There's a trick, of course (isn't there always a trick?). And Grand Master Funk kdog calls the dance steps:

Haven't seen a snazzy new Maytag like that, but suspect it is just a rebreanded K/A W/P
This is the same 4 pass "hidden" bake element used in the others - you just spread the insulation out of the way and slide the element out the side from the metal strip


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Source: Changing a hidden bake element in Maytag MER7662WW1 Oven






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