Lavit LB115 Service Manual page 44

The following four conditions may exist:
Dry powder This condition will only be present if the mix stream dispense volume is too
dispense or a low. A low mix stream volume can occur under the following circumstances:
large amount of
undissolved
powder.
1. The CO2 pressure is too high on the CO2 regulator and the high
pressure stops the soda pump from refilling the tank. Check that the
regulator setting is 3.5 bar. Purge CO2 from the rear of the unit.
2. Faulty soda pump. To verify that the soda pump is powered on
inspect the main PCB. The red plug connection marked PUMP feeds
24V DC to the soda pump. If the red LED adjacent to the PUMP
connection is on and the soda pump is not running then it indicates
that the pump is faulty and you should change it.
3. An airlock exists in the water line. If the water line to the soda pump
has an air lock then the pump will run but not fill the soda tank. To
clear an airlock you will need to power down the machine and
disconnect the outlet pipe from the soda pump to the soda tank. Turn
the machine back on and run the pump to waste until the soda pump
discharges without air. Power down, reconnect the water pipe to the
soda tank, power up and verify proper operation.
4. A short circuit exists in the level control line. A short between the
level probe wires will signal the PCB that the soda tank is full of
water. The PCB turns on the soda pump when the signal lines are
open circuit. To diagnose this fault unplug the soda tank level control
plug from the PCB (yellow plug marked probe). The soda pump
should run in this condition. Verify the red LED adjacent to the PUMP
connection is on. Replace the yellow probe plug and the pump will
stop. Dispense sparkling water. The soda pump should power on and
the red LED should be on. If it is not on then there is a short on the
signal lines, normally on the cap of the cold tank which can be caused
by condensation or a leak. Remove the cold tank insulation cap and
dry any condensation.
1. For a POU installation the inlet water stream pressure has been
reduced. If the inlet water is running through a filter ensure that the
filter is not clogged with sediment. If a low water pressure exists
recalibrating the mix stream may resolve the problem.
2. If the installation is running off of a bottled water supply check the
43
TM170915-B