Fault
Cause
ð
Possible remedy
Display: Low flow (cooling unit).
(Flow in the evaporator area too low)
n
Check whether the hydraulic circuit is blocked (closed
valves, jammed hose, dirt,...).
ð
remedy the cause.
n
Pump level is too low
ð
select a higher pump level.
n
Hose cross-section too small
ð
increase the cross-
section or install a bypass.
n
Cooling output is too high for the available flow rate
ð
reduce the cooling output.
Display: Low flow (heater)
(Flow in the heater area too low).
n
Check whether the hydraulic circuit is blocked (closed
valves, jammed hose, dirt,...).
ð
remedy the cause.
n
Pump level is too low
ð
select a higher pump level.
n
The device is not sufficiently aerated or degassed
ð
degas the device again.
n
Hose cross-section too small
ð
increase the cross-
section or install a bypass.
n
Heating output is too high for the available flow rate
ð
reduce the heating output.
Display: Overtemperature protection
n
Wait until the outflow temperature has cooled below
the overtemperature switch-off point or set the switch-
off point higher than the outflow temperature.
Display: Level very low
(Impending low level in expansion vessel)
Display: Low level
(Low level in expansion vessel)
n
Check hoses, connections and consumers for leaky
points (leaks)
ð
if necessary, eliminate the leakage and
top up the missing heat transfer liquid.
n
Check the constant temperature equipment as to
whether there is a leaky point (leak)
ð
if necessary
inform the LAUDA Service department
14.4 “Contact LAUDA” on page 160
n
The liquid level can drop due to cooling or degassing
ð
if necessary refill the missing heat transfer liquid.
Display: Level too high
(Impending high level in expansion vessel).
Display: Level too high
(High level in expansion vessel).
n
heating increases the volume
n
the heat transfer liquid has absorbed moisture from the
ambient air
Display: Pump blocked
(Pump motor monitoring: overload, blockage).
n
The viscosity of the heat transfer liquid is too high
ð
change to another heat transfer liquid or increase the
set temperature.
n
The pump is blocked
ð
inform the LAUDA Service
Display: Low level (pump)
(Pump motor monitoring: idling).
n
No liquid in system. If this is the case, the level mon-
itoring has failed.
ð
Check whether the float in the
expansion vessel is blocked by a foreign object. If not,
notify the LAUDA Service
LAUDA” on page 160 department.
V6
Integral Process Thermostats and High-Temperature Thermostats
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