If you're getting code 120/121, leave the DC cord on the cell, just pull it up a little (enough room to get a volt meter lead in) and check DC volts. Yes, 48 high it should normally be between 22-30 Volts DC.
Make sure the cord is pressed FIRMLY on the cell.
Remove & inspect cell. If it has calcium deposits on it, leaves, rocks etc (anything the filter and pump basket did not catch) then it need to be cleaned.
The following is directions from page 30 of the Aqua Pure Owners Manual:
http://www.jandy.com/html/productsupport/launchManual.php?url=H05675-RevE.pdf
Acid Wash Cleaning. If the electrolytic cell has a tendency to scale, it is recommended that every two
months the cell be removed and inspected for scale formation and/or debris. Some filters allow debris
to pass through to the cell which could lodge between the plates in the cell. A small amount of scale
formation is normal. If by looking through the cell it is observed that there is excessive scale formation
between the plates or debris is present, the cell must be cleaned as follows:
a. Use a high pressure jet of water from a garden hose. If the cell cannot be reasonably cleaned in
this manner, acid cleaning is necessary.
b. Remove the cell from the plumbing. Replace the cell with the spool piece, if necessary. Remove
the sensor from the port.
c. To acid clean the cell, plug the two adjacent ports. Mix one pint of muriatic acid with two quarts
of tap water in a plastic bucket. Use the appropriate port plugs on the ports. Do not use the
sensor as damage can result.
d. Pour the acid/water mixture inside the cell. A foaming action will begin, which is caused by
scale (calcium carbonate) being dissolved from the plates. If rigorous foaming action does not
begin, the cell does not need to be cleaned (STOP THE CLEANING PROCESS- go on to next
step “eâ€). Otherwise, allow the cell to remain in the solution until the foaming has stopped.
However,
do not leave in acid for more than 1/2 hour. *(Excessive Acid Washing will damage
Electrolytic Cell).
e. Rinse the cell thoroughly with clean tap water and inspect. If deposits are still visible, repeat the
cleaning procedure. Additional acid may need to be added to the solution.
f. Rinse the cell again with clean tap water and inspect. If clean, replace the cell and resume normal
operation.
g. If the acid wash procedure is necessary, it is recommended that a sample of pool water be
analyzed by an authorized AquaPure service representative for excessive hardness and/or
improper water balance.
h. If no scale or debris deposits are observed in the cell after two bimonthly inspections, it is not
necessary to continue bimonthly inspections. However, due to possible changes in pool water
chemistry and filtering effectiveness, it is recommended that the cell be removed for inspection at
least twice a year.
Reinstall the cell. Wait 15 minutes and check to see if you are still getting an error code. If this does not fix the problem, then I would check voltage from the Back PCB Board. Refer to page 7 of your owners manual or the above link. If you don't have 22-30 Volts DC coming out of the Back PCB Board, BINGO, there is your problem.
More then likely replacing the Back PCB board will fix the problem. I've replaced twice as many Back boards as I have cells. The cells are VERY expensive to replace. If fact you can almost buy an entire unit for what the cell costs.
Joe Williams
Aqua Doctor
[email protected]