V
11/2014
Temperature Control Unit 90smart/150smart
Operating Instructions
11
Malfunctions
WARNING
Unplug the mains plug before performing troubleshooting!
Error messages on the device
Display
Remark
The light is on if there is insufficient heat carrier - possible
causes:
Device is refilled
Cooling water supply not connected or shut off (shut-
off valve)
Filter
dirty
Solenoid valve water filling (
Y2
) dirty
Level switch defective
This light is on if the thermal relay has been triggered - possi-
ble causes:
Pump overheated (lines blocked)
Incorrect value set on thermal relay (see information
on electrical wiring diagram and rating plate on the
pump)
Switch thermal relay on again using the reset button
(
S5
) on the back of the control unit
Device malfunctions
Malfunc-
tion
Remark
Device
does not
heat up
Safety thermostat (
F5
) triggered:
Check level control (water level in the device) and
switch safety thermostat (
F5
) on again using reset
button on the heating
Heating contactor defective
Device
does not
cool
down
Water flow in cooler too low - possible causes:
Solenoid valve cooling defective or dirty
Filter
dirty
Cooler coated with lime
Replace cooler or clean using descaling unit
Device
overfilled
Automatic water filling does not switch off. Possible causes:
Float switch defective
Solenoid valve water filling (
Y2
) defective or dirty
Leak in cooler
Clean or replace defective parts
