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American Dispensing Company
88 Currant Road / Fall River, MA 02720-4781
42
NOTE: IF SAFETY SWITCH AT THE VERY TOP OF THE WATER TANK IS ACTIVATED,
IT INDICATES THE NORMAL “TANK FULL” SWITCH IS NOT FUNCTIONING
PROPERLY. REPLACE “TANK FULL” SWITCH (SECOND FROM THE TOP OF
THE WATER TANK).
PROBLEM
2. R.O. pump turns on, but without completely filling the tank, shuts itself off and 30 seconds or
more later turns itself on again, and repeats the cycle. (Check this if machine is constantly running
out of water even though not much is dispensed.)
3. Drain pump will not stop.
4. Drain pump will not run.
5. Drain pump runs but will not pump water.
CAUSE
2. A. Inadequate water inlet pressure or clogged strainer if the gauge before sediment filter is 25
psi or less with the R.O. pump running.
B. Clogged filters if gauge after sediment filter drop to 20 psi or less after starting at a higher
value. Pressure differential between the two gauges at the sediment filter is 10 psi or more.
3. A. Failed or jammed float switch at the bottom of the reservoir tank.
4. A. Drain pump needs about 1” of water before it is activated. If there is enough water, check
power to pump.
5. Failed pump.
CORRECTION
2. A. Clean strainer
B. Unless pressure drop is transient, a bigger pipe may be needed to bring water to the machine.
A booster pump capable of 4 gpm at 35 psi supplying water to the machine is also acceptable.
C. Replace sediment filter. If problem persists replace carbon filter.
3. A. Replace switch/remove obstacle.
4. A. Plug pump in.
B. Replace/reconnect float switch.
C. Replace pump.
5. Replace pump.