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Annual maintenance
NOTICE!
This maintenance must be performed by skilled technicians.
1) Check that the appliance is still firmly attached to the floor.
2) Check that the top of the kettle is horizontal in the normal position.
3) If the kettle has been fitted with a hinged lid, check that the lid closes correctly.
4) Check that all electric operating handles, control lamps, etc. are intact
5) Check that there are no loose components and that there is no wear or other circumstances which
could affect the safety of the kettle.
6) Check that no water has seeped into the pillars, where it could cause damage. Any water in the bot-
tom of the pillars must be removed.
7) Check that the gaskets on the front and rear covers are intact.
8) Check that the seals between the floor and pillars are intact.
9) Check that the water installations in the kettle’s pillars are not leaking.
10) Check that the controllable non-return valve in the water line to the steam generator is working. See
the “Service Manual” for further instructions.
(This point does not apply to steam-heated kettles, not fitted with the chilling function).
11) Checking dry-boiling thermostat.
The thermostat is located at the rear, bottom of the kettle and marked 'Reset'. Unscrew the plastic
cap and check for damage and leaks.
(This point does not apply to steam-heated kettles).
Fig. 0-43 Sign dry-boiling thermostat
12) As rubber hoses even under the most optimal conditions, have a limited lifespan, it is important to
check all hoses for cracks, chinks and rivets and blisters and the conditions of hose clips. To ensure
optimum reliability hoses that show signs of the above mentioned flaws must be replaced.
13) Shut off the water and clean the strainers, which are located before the solenoid valves.
NOTICE!
It may be necessary to clean the strainers more frequently.
14) Remove any sediment/lime scale deposits in the steam generator and level switch chamber.
This is particularly important on kettles with chilling, as the water in the steam generator is often re-
placed.
15) Check that the pressure gauge reads 0 bar when the kettle is cold.
16) Check that the vacuum valve is working correctly.Heat an empty kettle until the pressure reaches 0.8
– 1.0 bar. Then switch off the heat and fill the kettle with cold water, so that it is cooled.The negative
pressure can be read on the pressure gauge and must not exceed -0.3 bar.
17) Check that the pressure gauge reads 0.9 - 1.0 bar when the kettle is empty and has been standing
at maximum temperature for approximately 5 minutes.
18) On kettles with a stirrer, check that the stirrer stops when the lid is opened.
19) On kettles fitted with a stirrer and the SlowMix option, check the operation of the safety relay as de-