41
Cause
Remedy
Control unit incorrectly set.
Check the settings and correct if required:
■
DHW heating must be ON (see page 28)
■
DHW temperature (see page 28)
■
■
Switching times (see page 28)
DHW cylinder is cold.
Check the settings and correct if required:
■
Set DHW temperature (see page 28)
■
Heating times for DHW heating (see page 29)
If the heating times are OK: Check the temperature of
the DHW cylinder. If this temperature is too low: Heat
up the boiler (see page 15).
The DHW cylinder and boiler water temperature is too
low.
Charge the boiler with fuel. Heat up the boiler (see
page 15).
The DHW cylinder pump is not running.
Check the heating times. If according to the times set in
the control unit the pump should be running: Notify your
heating contractor.
Mixing valve faulty
Notify your heating contractor.
The DHW is too hot
Cause
Remedy
Control unit incorrectly set.
Check and correct the DHW temperature if required
(see page 28).
Sensor fault
Notify your heating contractor.
"Fault" is shown in the display
Cause
Remedy
Heating system fault
Check the type of fault (see page 37) and notify your
heating contractor.
is displayed
Cause
Remedy
Lambda probe deactivated. Emergency mode is active. Notify your heating contractor. The Lambda probe re-
quires calibration.
What to do if...
There is no hot water
5684 987 GB
Summary of Contents for Vitoligno 250-S
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