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Phillips3236

Apr 14, 2014
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Hi all, could someone help me with this circuit board. I have a tankless water heater and this board keeps going bad. I have replaced it 8 times and it's getting expensive. I was wanting to build a new board with components that will last. Thanks
 

KrisBlueNZ

Sadly passed away in 2015
Nov 28, 2011
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Hello and welcome to Electronics Point :)

My crystal ball was damaged by a power surge, so I'm afraid you're going to have to provide some information. Manufacturer, model number, photos of the board, description of what you mean by "bad", information on what was repaired in the past.
 

duke37

Jan 9, 2011
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Also country, voltage, frequency, load current or power.
 

Phillips3236

Apr 14, 2014
16
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Apr 14, 2014
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Hello and welcome to Electronics Point :)

My crystal ball was damaged by a power surge, so I'm afraid you're going to have to provide some information. Manufacturer, model number, photos of the board, description of what you mean by "bad", information on what was repaired in the past.
Does anyone have a email where I can send the pics it won't let me upload them.
 

Phillips3236

Apr 14, 2014
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http://s1274.photobucket.com/user/jophillips350/library/

(Moderator's note: I've edited this post to contain a link to the whole group of photos on photobucket. There are quite a few photos so I don't want to insert them all into the post. Users can view them on photobucket directly, by clicking that link. -- KrisBlueNZ)
 
Last edited by a moderator:

KrisBlueNZ

Sadly passed away in 2015
Nov 28, 2011
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I downloaded photo bucket and uploaded the images. How do I post them here
Log in to photobucket.com and click the image so you can view it on its own page. On the right side, at the top of the page, is a box headed "Links to share this photo". Click the URL in the "Direct" link and it will copy it to your computer's clipboard. Then when you're editing your post, click the "Image" tool (just right of the smiley face in the toolbar at the top of the post editor) and paste that URL into the field. This will insert the image directly into your post at the current cursor position.

Here's one I prepared earlier:

NOTSOHOT.gif
 

KrisBlueNZ

Sadly passed away in 2015
Nov 28, 2011
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OK, thanks for the pics.

When the unit was repaired in the past, was it just the circuit board that was replaced?

The circuit board has some LED indicators. Do they stop working when the unit stops working?

There are eight wires connecting to the board. Can you list what they connect to? I know some of them connect to the two triacs that are mounted onto the block of metal, but some of the other wires go to other things. Can you draw a diagram showing the eight connection points on the board and the external components and circuit points that they connect to?

Are there any other wires connected to the board?
 

Phillips3236

Apr 14, 2014
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Apr 14, 2014
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Yes the red led comes on for system active when the flow switch closes with water flow sensed.
 

KrisBlueNZ

Sadly passed away in 2015
Nov 28, 2011
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Right of the control knob, there's a three-terminal device marked IC2 78L06. It looks like it's suffered a hernia of some kind on its left hand side. Can you confirm this?
 

Phillips3236

Apr 14, 2014
16
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Right of the control knob, there's a three-terminal device marked IC2 78L06. It looks like it's suffered a hernia of some kind on its left hand side. Can you confirm this?
It's glue or something looks like they got glue on it room the yellow adjustable thing.
 

Phillips3236

Apr 14, 2014
16
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Apr 14, 2014
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OK, thanks for the pics.

When the unit was repaired in the past, was it just the circuit board that was replaced?

The circuit board has some LED indicators. Do they stop working when the unit stops working?

There are eight wires connecting to the board. Can you list what they connect to? I know some of them connect to the two triacs that are mounted onto the block of metal, but some of the other wires go to other things. Can you draw a diagram showing the eight connection points on the board and the external components and circuit points that they connect to?

Are there any other wires connected to the board?
http://i1274.photobucket.com/albums/y424/jophillips350/20140413_101404_zpsvrhjsfze.jpg
20140413_101404_zpsvrhjsfze.jpg


http://i1274.photobucket.com/albums/y424/jophillips350/Mobile Uploads/20140415_113544_zpsp6fsm0w1.jpg
20140415_113544_zpsp6fsm0w1.jpg
 
Last edited by a moderator:

Phillips3236

Apr 14, 2014
16
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Apr 14, 2014
Messages
16
I have only replaced the circuit board to get it to work. Actually I've replaced it 7 times
 
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