Viessmann VITOTRONIC 200 Service Instructions Manual page 134

Diagnosis
Ventilation
(cont.)
Message Meaning
code
0F Vitovent 200-C:
S
Short circuit/lead break,
outdoor air temperature
sensor and/or extract air
temperature sensor
Vitovent 300-F:
Short circuit/lead break,
■
outdoor air temperature
sensor and exhaust air
temperature sensor
Short circuit/lead break,
■
supply air temperature
sensor, if supply air
heating is carried out via
ventilation heating circuit
10 High limit safety cut-out on
S
electric preheating coil
has responded.
11 Only Vitovent 300-F:
H
Frost protection for hy-
draulic reheating coil ac-
tive
14 Supply air fan blockage,
S
fault or signal interruption
15 Exhaust air fan blockage,
S
fault or signal interruption
FF No communication with
S
ventilation unit when heat
pump control unit is
switched on, e.g. if ventila-
tion unit is not switched on
or the wrong type is set at
"Vitovent enable 7D00".
134
Ventilation unit character-
istics
Fans are switched off.
Vitovent 200-C: Defrost
■
function without electric
preheating coil is being
used.
Vitovent 300-F: Fans are
■
switched off.
The fans are switched off
and switched back on
again after a certain time.
Vitovent 200-C: Both fans
■
are switched off, restart
attempts at short inter-
vals.
Vitovent 300-F: Both fans
■
remain off.
Ventilation unit continues
■
to run with the last set de-
fault values.
or
"Standard operation" is
■
being activated.
Measure
Check resistance value (NTC 10 k
of ventilation unit sensor: See installa-
tion and service instructions for the
ventilation unit.
Check electric preheating coil. Re-
place preheating coil if necessary.
Vitovent 200-C: Replace thermal
■
breakers.
Vitovent 300-F: To restart, reset the
■
high limit safety cut-out. Turn the
ventilation unit off and back on again
at the ON/OFF switch.
No action required:
If the fault occurs several times, check
bypass damper mechanically.
Check fan for blockage or contami-
■
nation. Remove blockage if required.
Clean fan.
Check fan electrical and power con-
■
nections.
Check fan is mechanically and elec-
■
trically sound.
Replace fan if required.
■
Vitovent 300-F: Turn the ventilation
■
unit off and back on again at the
ON/OFF switch.
Switch ventilation unit on if required.
■
Check ventilation unit and Modbus
■
cable to heat pump. Replace the
ventilation unit controller PCB if nec-
essary.
Check parameter setting "Vitovent
■
enable 7D00". Correct setting if re-
quired.
If present, observe message "EF
■
Modbus subscriber" at heat pump
control unit.
)
Ω