What To Do If; The Display Screen Darkens; The Display Shows The Message "Your Heat Pump Is Stopped Because Of Evu Blockage; The Fault Symbol "U" Flashes On The Display Screen - Viessmann VITOCAL 200-G Operating Instructions Manual

What to do if...

The display screen darkens

Cause
Power failure/fault in the power supply
Fuse dropped out/blown
The equipment was switched OFF at
the system ON/OFF switch
The display shows the message "Your heat pump is stopped
because of EVU blockage"
Cause
This is not a fault.
This text is displayed during a power
interruption by your power supply uti-
lity (see also page 5).

The fault symbol "U" flashes on the display screen

Cause
Heating system fault
44
Remedy
The heat pump starts up automatically,
as soon as power is restored or the
fault is rectified
Notify your local contractor
Start the equipment (see page 11)
Remedy
The heat pump restarts in accordance
with the selected operating mode as
soon as the utility restores the power
supply.
Remedy
Scan the type of fault (see page 41)
and notify your local heating contractor