Viessmann Vitoclima 300-S Service Instructions For Contractors page 31

Diagnosis
(cont.)
If TV and radio reception suffers inter-
ference:
Activating test mode
The test mode enables the checking of the air-conditioning unit with fixed para-
meters.
Type OD306H
1. Set the equipment to "cooling,
16 °C set temperature and a high
fan speed" or "heating, 30 °C set
temperature and a high fan speed".
See operating instructions.
Type OT307H
Call up the test mode "Maintenance" at the programming unit of the external
unit (see page 31).
Menu structure overview (only external unit, type OT307H)
CL/ Operating mode
Ht/
Sb
tt Test mode ttC
mainte-
ttH
nance
It Test mode PSS Test passed
installation
FAL
Never route the air-conditioning
system cables together with aerial
cables.
Use aerial cables with a good
screen.
Use suppression filters.
Use signal amplifiers.
2. Hold down the "MODE" key at the
internal device (for duct mounted
devices at the receiver) for 5 to
10 s.
Cooling
Central heating
Fault
Troubleshooting
31