Sera PRECISION seramic pH Controller Manual De Instrucciones página 18

Troubleshooting
Problem
Readout display drifts during
adjustment
No display shown
Incorrect values displayed
Display shows "Err" during calibra-
tion process
Despite low pH value, the system
releases CO into the aquarium /
2
Despite high pH value, the system
does not release CO into the aquar-
2
ium / Solenoid valve is not working
Solenoid valve will not open
pH value rises despite the solenoid
valve is open
No bubbles in the bubble counter
CO consumption too high
2
Possible cause
Electrode is dirty or covered with
algae
Electrode has been dried for long
period
CO or air bubbles reach the tip of
2
electrode
Electrode too old / defective
Electrode was / is immersed too
deep in the water
Defective cable or electrode
Water has entered the control unit
Control unit is not connected to
electrical outlet
Too old or contaminated test
solutions
Protection cap left on the electrode Remove protection cap
Calibration mistake
Solenoid valve is defective caused
by water damage. Either non-return
valve was not used or the non-
return valve is defective
Operating pressure at the pressure
reducer is too high – above 1 bar
(14.5 psi.)
CO bottle is closed
2
CO bottle is empty
2
CO gas is expelled from water by
2
air stone, air diffusor, etc.
Exceeds the maximum aquarium
size
Pressure reducer incorrectly adjust-
ed (insufficient or no operating
pressure)
Non-return valve incorrectly con-
nected
Non-return valve clogged or
defective
Leakage in hose system or in the
hose fitting
Leakage in CO hose system or
2
hoses too long
Operating pressure too high
Sealing ring between pressure reduc-
er and CO bottle defective / dirty
2
Reactor dirty or water pressure too
low, CO bubbles escape
2
18
Troubleshooting
Clean with sera cleaning solution,
then soak in sera care solution KCl
Soak electrode for 12 hours, then
recalibrate. Replace electrode if
electrode calibration is unsuccessful
Move the electrode to another
place in the aquarium
Replace
Replace or move electrode to
another place in the aquarium
Replace
See your retailer
Plug it in
Replace with new test solutions
Recalibrate, see "Calibration
process" (page 15).
Are the test solutions intact?
Needs repair (see your retailer)
At first manual control: close CO
supply at the bottle. Shut off pres-
sure reducer and outlet valves.
Remove CO hose from outlet valve.
2
Find out whether control unit is
working by changing the desired pH
value. If not see your retailer. If
yes, attach hose again and adjust
operating pressure (1 bar / 14.5 psi.)
correctly as described in the instruc-
tions for use
Open CO bottle
2
Refill CO bottle
2
Avoid air bubbling in the water
Increase CO addition and install
2
additional sera CO fertilization sys-
2
tem
Increase operating pressure
Check valve fittings and correct
connection if necessary
Replace
Check hoses and fittings and
replace hoses if necessary
Replace or shorten hose
Lower operating pressure at the
pressure reducer
Replace
Clean reactor or direct more water
into the reactor
2