Heat Pump - Viessmann VITOTRONIC 200 Service Instructions Manual

Diagnosis
Ventilation
(cont.)
Message Meaning
code
05 Short circuit/lead break,
S
outdoor air temperature
sensor
07 Short circuit/lead break,
S
extract air temperature
sensor
0A Signal reception from cen-
S
tral humidity sensor inter-
rupted
14 Supply air fan blockage,
S
fault or signal interruption
15 Exhaust air fan blockage,
S
fault or signal interruption
1B Pressure sensor in the
S
supply air fan faulty, or
pressure hoses (red)
blocked or kinked
1C Pressure sensor in the ex-
S
haust air fan faulty, pres-
sure hoses (blue) blocked
or kinked
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".

Heat pump

Compressor runtime
1. Service menu:
Press and hold OK +
approx. 4 s.
136
Ventilation unit character-
istics
Both fans are stopped.
■
The preheating coil is
■
switched off.
Bypass blocked.
■
Bypass blocked.
Ventilation unit remains op-
erational, no regulation of
the humidity level.
Both fans are stopped.
■
Electric preheating coils
■
are switched off.
Ventilation with a con-
■
stant fan speed
If the outdoor air temper-
■
ature is < 0 °C, the facto-
ry-fitted electric preheat-
ing coil switches on.
Ventilation unit continues to
run with the last values
specified.
simultaneously for
å
Measure
Check resistance value (NTC 10 k
at connection X7.1/X7.2 on the con-
troller PCB of the ventilation unit: See
installation and service instructions for
the ventilation unit.
Check resistance value (NTC 10 k
at connection X17.1/X17.2 on the con-
troller PCB of the ventilation unit: See
installation and service instructions for
the ventilation unit.
Check central humidity sensor. Isolate
the ventilation unit from the power
supply. Replace humidity sensor if re-
quired.
Check fan for blockage or contami-
■
nation. Remove any blockages.
Clean fan.
Check fan electrical connections and
■
connecting cable.
Check fan is mechanically and elec-
■
trically sound.
Replace fan if required.
■
Check the pressure hoses (red) for
■
contamination, kinks and damage:
See installation and service instruc-
tions for the ventilation unit.
Check the pressure sensor in the
■
supply air fan. Replace fan if re-
quired.
Check the pressure hoses (blue) for
■
contamination, kinks and damage:
See installation and service instruc-
tions for the ventilation unit.
Check the pressure sensor in the ex-
■
haust air fan. Replace fan if re-
quired.
Switch ventilation unit on if required.
■
Check ventilation unit and Modbus
■
cable to heat pump. Replace ventila-
tion unit controller PCB if necessary.
Check parameter setting "Vitovent
■
enable 7D00". Correct setting if re-
quired.
If present, observe message "EF
■
Modbus subscriber" at heat pump
control unit.
2. "Diagnosis"
3. "Heat pump"
)
Ω
)
Ω