No lights on my Hayward SWG

[Katodude]

So I have no power, no LCD, no nothing.

I checked that power was being delivered to the unit. I checked the 20amp fuse.

What else should I be looking for?

 

[mknauss]

From Hayward Aquarite SWG - Further Reading
Symptoms of a bad thermistor include no power and chlorinating light, no power to salt cell.[23]

 

[johnnydot]

yep, that's what it sounds like.

 

[Katodude]

Hmmm, I have replaced a few thermistors and usually they look damaged and the power light is still on but not the chlorinating light.

Anyway, I trust you guys, so two thermistors on order from Amazon, hopefully should be here tomorrow.

 

[Mdragger88]

🤞hopefully you’ll be back in business soon!
Don’t forget the bleach!

 

[Katodude]

Don’t forget the bleach!

I know!!! Fortunately I keep my FC hot so by the time I noticed there something was wrong no damage to the pool. I have enough LC to make it through tomorrow if they arrive in time. Otherwise its jug dumping for me. I now remember how much I hate having to get chlorine and adding every day.

 

[JamesW]

It looks like maybe the transformer burned out.

See the black mark at arrow.

If you have 120 volts at the two power in terminals, check for 24 volts AC at the yellow wires coming out of the transformer.

 

[JamesW]

 

[JamesW]

The thermistor looks cracked, so you should replace that.

I think that the transformer is also bad because you would still have a display if the board was getting power.

https://images.inyopools.com/cloud/documents/aquarite-troubleshooting-guide.pdf

 

[Katodude]

@JamesW you have some seriously crazy good eyes.

On closer inspection the thermistor does look cracked. It looks worse in the picture that it does in person.

The discoloration that you see in the transformer is just because of the light. There is no burning there.

The transformed is putting out 24VAC when powered.

However, when I disconnected the power and measured the resistance I was getting 5.5 ohms

I am getting 32v DC across the black and red wires.

 

[JamesW]

However, when I disconnected the power and measured the resistance I was getting 5.5 ohms

That’s out of spec.

Were both readings the same?

Are you sure that your meter is good?

Do you get 0 ohms when testing lead to lead?

The display will still work with a bad thermistor, so it seems like more than just a cracked thermistor.

Jump the two thermistor legs together to see if that gives you a display, but leave the switch in the off position.

Try resetting the display board and checking for voltage on the pins.

https://images.inyopools.com/cloud/documents/aquarite-troubleshooting-guide.pdf

 

[Katodude]

So both reading were consistent.
However, my ohm meter is probably not accurate as I get a .8 ohm reading when I just touch the leads.
I still get 23.6VAC from the transformer

When I pull the DSP board out I get 4.9V DC across pins 1 and 4. Nothing across 1 and 3. Unless I and struggling to count.
None of the pins are bent and it is seated properly.

Jumping the thermistor does nothing.

I have ordered a new DSP board just in case.

 

[JamesW]

Nothing across 1 and 3.

Maybe double check.

If no voltage, it would seem like the main board might be bad.

How old is everything?

 

[JamesW]

Visually inspect main PCB board for any damaged or burnt components.

 

[Katodude]

Board looks ok, but ordered a new main board as well. Will send back what I dont need.

 

[Katodude]

So I measured again. There are 7 pins. Assuming 1 is the left most pin. There is almost 5v between 1-4, 1-5, 1-7. No voltage between 1-3.

All the new boards should arrive in a few days.

 

[Katodude]

Well, Amazon says the main board should be arriving today.

I dont know how people live without a SWG. I had to go to Leslies yesterday to buy Chlorine. I have to test daily to make sure I put in enough. Its a real hassle.

 

[JamesW]

Nothing across 1 and 3.

Was this with the display board on or off?

 

[Katodude]

Both with the display board off and on. Although its hard to measure with the board on so I might have messed that up.

Willing to try again with the board on.

 

[Katodude]

So with the display board on, I get no voltage across any of the pins.