Wega Espresso Coffee Machine Service Manual download pdf (Page 26)

espresso coffee machine - instructions for technician

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21. MALFUNCTIONS AND CORRESPONDING SOLUTIONS

Indication Cause Solution

NO POWER

TO MACHINE

The machine commutator is in position “0” or “1”

2) The machine switch is defective

3) The mains power supply switch is in the OFF position

4) The connection to the electrical mains is defective

1) Replace the solenoid valve of the automatic level device

2) Replace the heat exchanger

3) Check the level probe, the earth of the

frame and the operation of the electronic control unit

NO WATER

IN BOILER

1) The water mains tap is closed

2) The cut-off tap of the automatic level device is in the

closed position

3) The pump filter is closed

4) The motor pump is disconnected or blocked

5) The water filling solenoid is defective

The water inlet solenoid valve filter is clogged

1) Open the water mains tap

2) Open the automatic level device tap

3) Replace the pump filter

4) Check the motor pump

5) Replace the water filling solenoid valve

6) Clean or replace the filter of the solenoid valve

EXCESSIVE WATER

IN BOILER

1) The solenoid of the automatic level device is defective

2) The heat exchanger is perforated

3) The manual valve remains inserted

1) Turn the machine commutator to position “2”

2) Replace the main switch

3) Place the mains switch in the ON position

4) Check for any defective connections

STEAM DOES NOT COME

OUT OF NOZZLES

1) The electrical heating element is defective

2) The pressure switch contacts are oxidized

3) The heating element protection thermostat has cut in

4) The nozzle sprayer is clogged

5) Machine switch in position “1”

1) Replace the electrical heating element

2) Clean the contacts or replace the pressure switch

3) Reset the heating element protection

4) Clean the steam nozzle sprayer

5) Turn the machine switch to position “2”

STEAM MIXED WITH WATER

COMES OUT OF

THE NOZZLES

1)The boiler level is too high 1) Check the status of the level probe:

verify correct position and check for

presence of any surface lime scale

NO DELIVERY

1) No water mains

2) Group solenoid valve is defective

3) The pump is blocked

4) The control unit fuse is burned out

5) The injector is clogged

The group solenoid valve is clogged or dirty

7) The group filter is clogged

8) The volumetric dosing device is blocked

1) Check that there is water in the mains

2) Replace the group solenoid valve

3) Replace the pump

Replace the solenoid valve protection fuse (1A)

5) Clean or replace the injector

6) Clean or replace the solenoid valve

7) Clean or replace the filter

8) Check/replace the dosing device

WATER LEAKS

FROM THE MACHINE

1) The tub does not drain

2) The drain tube is detached or broken or has

obstruction to water flow

3) Hydraulic leaks in the hydraulic circuit

1) Check the sewer drain

2) Check and restore the connection of the

drain tube to the tub

3) Identify and eliminate hydraulic leaks

COFFEE IS

TOO COLD

1) The electrical heating element is defective

2) The electrical connection is defective

3) Lime scale on the exchangers and/or heating element

4) The pressure switch contacts are oxidized

5) The heating element protection thermostat has cut in

6) Machine switch in position “1”

7) The lime scale has reduced the

circulation of water

8) The delivery group is cold

1) Replace the electrical heating element

2) Check for any defective connections

3) Clean the machine

4) Clean the contacts or replace the pressure switch

5) Reset the heating element protection

6) Turn the machine switch to position “2”

7) Clean the connections of the exchanger, and clean or

replace the two circulation tubes

8) Eliminate air pockets in the

hydraulic circuit in the following manner:

- disconnect the electrical power supply to the pump

- close the water tap of the softener

perform a dry run of delivery for a few minutes

- reconnect the electrical power supply to the pump

- open the water outlet tap of the softener

- perform delivery until water comes out

- wait a few minutes for heating

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Wega Espresso Coffee Machine Service Manual Page 26

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