Control and operation
HICO-VARIOTHERM 550
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6.3.2 Alarm description during operation
6.3.2.1 Display message: WATER LEVEL!?
The unit triggers this alarm if the water level drops below the MIN
mark on the water level indicator (6) during operation. The
display shows "WATER LEVEL!?", the yellow fault lamp (13)
flashes and a pulsating signal tone sounds.
•
Press the "Audio paused" key (18) to interrupt the audible
alarm for 10 minutes.
•
Immediately fill up sterile filtered tap water to which a
germicidal agent has been added, until the water level is just
below the MAX mark (6) (see chapter 4.3.1 “Filling the system
with water”).
► In case of a too low water level a sufficient water circulation
can no longer be assured.
► A too low water level can cause damage to components of
the unit and thus lead to total failure of the unit.
6.3.2.2 Display message: TEMP.DIFF >1 °C
Should the water pad temperature deviate from the set nominal
temperature by more than 1 °C during operation, the unit will
trigger this alarm. The display shows "TEMP.DIFF. >1 °C", the
yellow fault lamp (13) flashes and a pulse signal tone sounds.
•
Press the "Audio paused" key (18) to interrupt the audible
alarm for 10 minutes.
•
Change the nominal value, until the unit is able to regulate the
temperature reliably.
► Connecting or disconnecting a water pad during operation
can cause an alarm triggering temperature difference.
► The alarm can be triggered in unfavourable room
temperatures, because the specified nominal value (e.g.
15 °C or 39 °C) can in this case not be achieved. Change
the nominal value until the unit is able to regulate the
temperature reliably.
► After switching on the unit and after changing the nominal
temperature this alarm function is suppressed over a
specified period of time.
