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Troubleshooting
11
Logamatic 4321/4322 - Subject to technical modifications.
73
11.1 Simple troubleshooting
If no fault messages are displayed in spite of cool
rooms or cool DHW, something may be set up
incorrectly or in error.
Observation Possible cause(s) Measure
Control unit remains blank or does
not function
ON/OFF switch set to "OFF".
No power supply.
ON/OFF switch set to
"ON".
Check mains electrical
fuse.
Heating system
emergency stop switch
set to "ON".
MEC2 display blank
MEC2 incorrectly plugged in (contact
problems).
Fit MEC2 correctly.
Room cool
The actual room temperature for the
respective heating circuit is incorrectly
displayed.
Check the heating circuit
assignment.
The programming unit operates in
setback mode.
Check and possibly
modify time and heating
program.
Set room temperature is too low. Change the set room
temperature.
DHW supply runs too long. Check DHW heating.
Heat sources deliver insufficient heating
energy or are shut down.
Check heat source.
Room temperature sensor is incorrectly
adjusted.
Sensor adjustment.
DHW cool
DHW is set to the wrong temperature. Correct the DHW
temperature setting.
Switching program is incorrectly set up. Re-program the switching
program.
DHW too cold
(if DHW is heated by external heat
source)
External heat sources supply insufficient
heating energy.
Check heat source.
Tab. 3 Simple troubleshooting
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