Buderus Logamatic 4321, Operating Instructions Manual

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Correcting faults and troubleshooting 11
Logamatic 4321/4322 - Technical specifications are subject to change without prior notice. 72
11.1 Simple troubleshooting
If no fault messages are displayed on the control
panel in spite of cool rooms or cool DHW, there may
be an incorrect setting.
Observation Possible cause(s) Action
Control panel remains dark or
does not function
– ON/OFF switch set to "OFF".
– No power supply.
– ON/OFF switch set to "ON".
– Check mains electrical circuit
breaker.
– Heating system emergency
shut-off switch set to "ON".
MEC2 display dark
– MEC2 incorrectly plugged in (contact
problems). – Install MEC2 correctly.
Room cool
– Actual room temperature for the
respective heating zone is incorrectly
displayed. – Check the heating zone
assignment.
– Control panel operates in setback mode. – Check time and heating
program, and modify if required.
– Set room temperature too low. – Correct set room temperature.
– DHW supply runs for too long. – Check DHW heating.
– Heat sources deliver insufficient heating
energy or are shut down. – Check heat sources.
– Room temperature sensor is incorrectly
placed. – Sensor adjustment.
DHW cool
– DHW is set to the wrong temperature. – Correct the DHW setting.
– Switching program is incorrectly set up. – Re-program the switching
program.
DHW cool
(if DHW is heated by external
heat source)
– External heat sources supply insufficient
heating energy. – Check heat sources.
Tab. 3 Simple troubleshooting