Viessmann VITOCAL 250-A - Page 172

172
Measures
1. Check all cables connected to the compressor:
■
Check wires and plugs for correct seating.
■
Check connections for contact corrosion.
■
Check cables for mechanical damage, e.g. crush-
ing, kinking, chafing or breakage.
Replace cable if necessary.
2. Have parameters of compressor checked by Viess-
mann Technical Service.
3. Isolate the outdoor unit from the power supply. Wait
at least 2 min. Switch on voltage again.
4. Replace inverter.
F.1196 Fault, analogue/digital converter, inverter
F.1196
System characteristics
■
Inverter protects compressor by controlling the cur-
rent feed (secure operation).
■
Compressor not available
Cause
Fault in inverter microcontroller
Measures
1. Isolate the outdoor unit from the power supply. Wait
at least 2 min. Switch on voltage again.
2. Replace inverter.
F.1216 Loss of communication with the lead heat pump
F.1216
System characteristics
Limited operation of the heat pump cascade
Cause
■
No mains voltage
■
The lead heat pump is off.
■
The lead heat pump was not commissioned cor-
rectly.
■
Communication fault, CAN bus
Measures
1. Check the power supply to the lead heat pump.
2. Isolate the lead heat pump from the power supply.
Wait at least 4 min. Switch on voltage again.
3. Check the following CAN bus connections:
■
Connection X8.1 to X8.3 on plug 91 on HPMU
electronics module
■
Wall mounted indoor unit: Connection on device
underside, 6-pole connection socket on the left,
terminals 1.CAN L to 3.CAN H
■
Floorstanding indoor unit: Connection to luster ter-
minals for bus connections, terminals 91.CAN L to
91.CAN H
■
Check wires and plugs for correct seating.
■
Check connections for contact corrosion.
■
Check cables for mechanical damage, e.g. crush-
ing, kinking, chafing or breakage.
■
Check CAN L/CAN H assignment.
■
CAN Ground (GND) must not be connected.
■
Check cable type: Li2YCYv, twisted pair, shielded
or 2-core CAT5, shielded
■
Check cable length.
■
Check the position and number of terminators.
4. Check the settings in the commissioning assistant.
Restore factory settings if necessary.
5. Check the software versions of the HPMU and
EHCU electronics modules in ViGuide. Update if
necessary.
Messages
Fault messages (cont.)
6218234
Diagnosis