Dosing Pump Broke

[Paradiddle7]

Does anyone know how to fix the dosing pump? My channel A pump stopped working alltogether.

[nemo's janitor]

Hi Paradiddle7,

Dosing pump modules that i have problems with have had salt damage. Normally around the push button and led. I cleaned the pc board with benzene, a PC board cleaner is better if you have, and then repaired the tracks.
You might also want to try. Remove the white plastic pump(replacements are available) and check if the motor turns when you press the manual dosing button on the module. The white plastic pump might be jammed.
I am just interested, did you receive an error on your controller?

[Paradiddle7]

I took off the white plastic but the motor didn't turn on its own.

I've had so many problems with my AT. I've returned 4 pieces of hardware so far for replacement. I have no faith in my AT components. This failure almost cost me my tank. Part of that was laziness on my part and testing my params at longer intervals but I didn't expect my dosing pump to break in just 6 months of operation.

I know I'll get slammed for this, but I can't possibly recommend AT to another hobbyist. I'd like to have my $1800 back.

[nemo's janitor]

Wow 4 pieces of faulty hardware on one system. That is very unusual. I think of all the systems i have installed i can count the number of hardware failures on one hand. This excludes the density probes of course.
Do a number of tests like push the manual button and see if the led lights. Do a manual dose from the PC software, Does the dosing show on the PC software monitoring etc It will give us a better idea of what is wrong. But most times it is a bit of salt water that has dripped onto the module and found it's way to the PCB.

[Paradiddle7]

Nothing works. No light, no manual dose etc...

Are you suggesting that I open up the unit and clean the PCB then? Won't that void my warranty?

Yes, one of my faulty pieces of hardware was the density probe and the ph probe. My ethernet module never worked, I still haven't tested the replacement, and now the dosing pump. The dosing pump is on a seperate rack away from anything moist and up fairly high. It's not impossible that it didn't get a drop of water on it, but 2 of the pumps are still working fine.

[nemo's janitor]

As long as you do not solder or try to change anything the warranty should be fine. If it has got salt damage the warranty is gone anyway
Remove the four screws on the back of the unit and slid the top cover off to check. If all looks fine reassemble and return for replacement/repair. If it has got salt clean and try to repair. sometimes it is the switch, others a track that has corroded.

[nemo's janitor]

One other little thing. You do know that only one pump works at a time. So "A" wont work while "B" or "C" is working/going through a program.

[Paradiddle7]

Yes, I realize that. Trust me, the pump is broken.

[RobbyG]

Paradiddle how close do you have you equipment to salt water splash? If you get SW on your electronic equipment it will die very quickly.