Question about Rheem Gt 199x Natural Gas Commercial Commercial Tankless Water Heaters

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Circuit board for gt-199x

Replacing the circuit

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My whirlpool dishwasher adp7955 display error code f8 e2 and is frozen

F8 - Drain motor not functioning.

Load sensing circuit indicates that the drain motor is not operational. This could be caused by a faulty control, drain motor, or wiring.

1. Check connection:
Drain motor < - > harness < - > control board
2. Check harness continuity.
3. Check if drain motor is supplied (from board) or Check with different control board.
4. Replace drain motor


Feb 21, 2015 | Whirlpool Dishwashers

1 Answer


The lights are controlled by door switches and a small circuit board near the compressor=> W10135090 Main Control Board
The control board is quite expensive and if you know someone that can replace circuit board parts it would really pay to have them replace a defective relay, Thanks Sea Breeze

Jan 30, 2013 | Whirlpool Gold White-on-White 21.9 cu. ft....

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A/c is on and the gas heat suddenly will turn on

Not my area of expertise Cedric.

Just wanted to state, someone hooked that replacement circuit board up, wrong.
Or the thermostat wires aren't hooked up right.

Best suggestion here is you repost this question.

Post in -> Home & Garden > Household Appliances >
Furnaces & Boilers


Jan 21, 2013 | Computers & Internet

2 Answers

Toshiba 280 copier c440

0 + 8 --> power on
400 --> start --> 0 --> interrupt

Jan 09, 2013 | Toshiba E Studio 230 280 Copier

1 Answer

Glrs237zdw temp goes from 29 to 60

I am not sure if you said you checked the=> 5303918476 Defrost Control Board or here=> 5303918476 If you replaced the defrost thermostat inside the freezer that is most likely not the problem. These defrost control boards will really cause strange things to happen. Sometimes by unplugging and taking out the control board you will see burn marks or signs of heat damage on the printed circuit, not always. Unplug and open the control panel inside the fresh food compartment=> GLRS237ZW2 Control Panel

You will see part/location number 23 is your 5303918476 Defrost Control Board If I misunderstand please let me know so I can help you resolve this problem. Thanks Sea Breeze

Feb 12, 2012 | Frigidaire Freezers

1 Answer

Sound but no picture. Two and a half years old.

If this set is under warranty you should return it to get it fix/replace. (Being this old it probably isn't.)
If not then;
This sounds like the inverter/backlight board has failed.
This board controls the back-light for the set.

IF YOU KNOW HOW TO WORK WITH ELECTRONICS REPAIR or have a friend with knowledge/skill you can fix it.

>Unplug the set.
>Remove the back cover.
>Remove the shield cover over the inverter board(s).
>Unplug the cables connected to the board.
>Remove the screws holding the board.
>Put in the replacement board and replace the screws.
>Plug the cables into the board.
>Replace the shield cover over the boards.
>Replace the back cover.

When replace the circuit boards, avoid touching the front or back and handle by the edges to avoid contaminates and static

Get the part number that matches your board.

A search shows that this tv has two inverter boards. The one I show is the Master and the other is the Slave.
(The Slave inverter is sometime called Ballast board;)
If you do it yourself you can replace both to know you corrected the problem.

.You can get this part from several places.

It looks something like;


Feb 16, 2011 | Vizio 42 in. LCD TV

1 Answer

Is there a work around for installing a new Temp Control circuit board in a GE Refrigerator Model # PSS27NGMA WW. Orig bd has 3 connectors and new bd only has 2 connectors. I am attempting to replace...

I have a feeling that the temperature control board is not the problem. The fresh food compartment has two thermistors that relay information to motherboard through your control panel. If thermistor is bad or covered by an item it will continue to cool and freeze fresh food. Your air damper between freezer and fresh food compartment may also be wide open. Click Here=> Service Manual Tech Sheet Click Here=> Tech Sheet If you need additional assistance please let me know here or HERE, Thanks, Sea Breeze

Dec 21, 2010 | Refrigerators

1 Answer

My daughter broke one of my usb ports in the front of my asus cm1630 how do i get replacment parts can i buy a usb 2 or do i have to buy the whole setup that contains the usb ports and media card slots

USB 2.0 refers to the technology, not the connector itself.

Obtain another USB connector, and solder it in?
Sure, maybe. Depends on your de-soldering/soldering skills, and if the circuit board is damaged.

> Physically damaged in that the board is cracked, and circuit traces are ripped loose, (Repairable with a jumper wire, or wires), AND/OR the USB port was fried out (Short Circuit), and it fried out the entire circuit board.

Obtain another circuit board? This would be the way to go IMHO, but try to find one.
You may have luck on Ebay looking at Desktop Computers > Computers for Parts, or the actual circuit board itself, dunno.




(PDF file. Takes approximately 20 seconds to download. {Time it takes also until you see the first page)

For questions post in a Comment.


Dec 12, 2010 | ASUS Computers & Internet

1 Answer

Nvidia 8600gt 512 MB chipset is not working in my DV9700t HP pavallion laptop. Same model is not sold here so HP autorised service centre could not repair it, also this laptop was not having world wide...

The Nvidia GeForce 8600M GT chipset isn't the problem. It's the cooling system.

The cooling system is inadequate. It cannot cool the Processor, AND the Nvidia GeForce 8600M GT chipset properly.

HP knows this.

When the Nvidia GeForce 8600M GT chipset overheats, it comes loose from it's motherboard mounting.

The method of mounting the 8600M GT is connected in a BGA mount.
Ball Grid Array.

To explain:
A) Chip and Chipset are slang terms for I.C. Integrated Circuit.

B) GPU = Graphics Processing Unit

The GPU is mounted on a small circuit board, and then the circuit board has a method of mounting to the motherboard.

With a Processor, the chipset is also mounted on a small circuit board. On the bottom of the circuit board are pins. These pins go down into socket holes in the processor socket.
(Or you have Processors with the socket holes, and the processor socket has the pins)

Instead of pins for mounting, there are round solder balls on the bottom of the small circuit board.
On the motherboard area that the circuit board is to be mounted to, there are a matching number of copper pads.
(We are talking REAL SMALL here. Copper pads about the size of a straight pin head, solder balls about twice the size of this period >. )

The circuit board with it's solder balls, is set into position on the motherboard with it's copper pads.
Heat is used to melt the solder balls, and they solder to the copper pads.

The cooling system in the HP Pavilion dv9700t Notebook PC (Laptop) consists of a Fan/Heatsink Assembly.

The fan draws air up from the bottom, and pushes air through the fins of the Heatsink.
The Heatsink is attached to a long copper tube.
The copper tube has two flat copper plates on it.

One copper plate sits on top of the Processor's case.
The other copper plate sits on top the GPU chip.

Heat is drawn from the Processor, and from the GPU chip to the copper plates. The heat is then transferred to the copper tube, and then to the Heatsink.

It's a POOR design.

NOT having worldwide warranty? Oh?

Watch the entire video. Also states a method to fix the problem.

Nov 19, 2010 | HP Pavilion dv9000z Notebook

1 Answer

Waring pro Waffle Maker has no power

One thing missing from my WMK300 is a circuit breaker or replaceable fuse. Apparently your wiring became the fuse. Please read and understand my entire Answer before starting.
>>This answer is only for technicians proficient in soldering, with safety training in testing 120 VAC circuits and with an understanding of insulation temperature ratings. Memorize the average torque required to loosen each type of screw and do not exceed that torque when tightening.<<
It is likely that the wires leading to the heating elements are defective. You must open the top and bottom clamshells to inspect the wires inside there. Look for melted insulation, cracked stand-off insulation posts, etc. You will have to repair the obvious problems before the next steps.
>> It is helpful to have a multimeter to test resistance. The heating elements should not have continuity to the metal chassis or ground wire. The resistance of the heating elements should be in a sensible range given the wattage rating of this appliance.<<
If the wire under the damaged insulation is in great condition, you may just repair the insulation. In the base, you may use normal wiring insulation since this area stays cool. I recommend slipping some larger diameter insulation over the wire. (Strip this off a larger diameter wire.) In the hot clamshells, you must use high-temperature insulation like the woven fiberglass sheath used in toasters and ovens.
The two white heavy gauge wires connect to "N" (neutral) and "H2" (heater lead 2). The two black wires connect to "L" (line power) and "H1" (heater lead 1). If only one wire came off you should be able to find the correct solder point to reattach.
This circuit board is not replaceable and there are no components on the circuit board that should be capable of drawing enough current to melt the power wires. However, if you cannot find bad wiring elsewhere, inspect the circuit board for solder droplets, bits of wire, screws, bent components, etc. that may cause shorts. Look for overheated circuit board, traces or components.
>>To remove the circuit board on my WMK300, the temperature control knob is left intact on the control panel. Do not remove it. The circuit board lifts off the shaft of the control knob when it is removed from the chassis. Test the knob motion when mating it to the circuit board.<<
Almost all components except the potentiometer and the 8-pin microprocessor controller "U1" are easy to purchase online.

May 23, 2010 | Waring WMK300 Professional Belgian Waffle...

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