Elec. Heating Blocked - Viessmann VITOTRONIC 200 Service Instructions Manual

Message overview
(cont.)
2nd digit of the additional code
Additional message
2nd digit
1
2
4
8
Values from example

04 Elec. heating blocked

The instantaneous heating water heater is not started,
not even for frost protection.
!
Please note
If the compressor does not start, the system
may no longer be protected against frost.
Ensure frost protection on site.
Cause
The prompt "Secondary circuit filled?" during ena-
bling of the instantaneous heating water heater was an-
swered with "No".
"Enable instantaneous heating water heater 7900"
is automatically set to "2".
05 Refrigerant circuit
Additional code
Last message in message histo-
ry, refrigerant circuit
Cause
Incorrect system scheme (contains non-supported
heating circuit)
Cooling circuit parameters incorrect
Room temperature sensor for cooling set from un-
■
available remote control
"Max. flow temperature heating circuit 200E" set
■
lower than "Min. flow temperature cooling 7103"
Cooling set for unavailable heating/cooling circuit
■
Flow temperature sensor for cooling circuit not ena-
■
bled
Active cooling is set, despite not being supported by
■
the heat pump
Cooling is set for a heating/cooling circuit but the
■
mixer controlled via KM-BUS is not suitable for cool-
ing mode.
Cascade via LON
"Cascade control 700A" set to "2", although "Ena-
■
ble LON communication module 7710" is not set
to "1".
4 lag heat pumps set ("Number of lag heat pumps
■
7029" set to "4") and external heat generator set via
LON ("Switch external heat source 7B12" set to
"1" or "2")
Parameters for circulation pumps with PWM control set
incorrectly
Cause
Fault message from the refrigerant
circuit controller
Measure
Fill and vent the secondary circuit. Then enable the in-
stantaneous heating water heater: Set "Enable instan-
taneous heating water heater 7900" to "1". Confirm
prompt "Secondary circuit filled?" with "Yes".
Action
Observe "Diagnosis"
circuit"
Troubleshooting
Measure
Check and adjust relevant
parameters. If necessary,
restore factory settings (re-
set) and reconfigure sys-
tem.
Contact a heat pump spe-
cialist certified by
Viessmann if the cause of
the fault cannot be re-
moved.
As for 1 and 2
"Refrigerant
"Message history".
77