Service actions
NOTE
Servicing should only be carried out by persons
with the necessary expertise.
When replacing components on S1255 only replace-
ment parts from NIBE may be used.
EMERGENCY MODE
NOTE
Do not start the system before filling up with wa-
ter. Components in the system could be damaged.
Emergency mode is used in event of operational interference
and in conjunction with service.
You can activate the emergency mode both when S1255 is
running and when it is switched off.
When the emergency mode is active, the status lamp turns
yellow.
To activate when S1255 is running: press and hold the on/off
button (SF1) for 2 seconds and select "emergency mode"
from the shutdown menu.
To activate emergency mode when S1255 is switched off:
press and hold the on/off button (SF1) for 5 seconds. (De-
activate the emergency mode by pressing once.)
When S1255 is put in emergency mode, the display is
switched off and the most basic functions are active:
• The immersion heater works to maintain the calculated
supply temperature. If there is no outdoor temperature
sensor (BT1), the immersion heater works to maintain the
maximum supply temperature, set in menu 1.30.6 -
"Highest supply heat".
• The compressor and the brine pump are off and only the
heating medium pump and the electric additional heat are
active. The immersion heater is stepped according to the
setting in menu 7.1.8.2 - Emergency mode.
The image shows an example of what a cooling section could look like.
EP14-QM34
EP14-QM31
EP14-QM32
EP14-QM33
SF1
XL7
XL2
DRAINING THE HOT WATER HEATER
The siphon principle is used to empty the hot water heater.
This can be done either via the drain valve on the incoming
cold water pipe or by inserting a hose into the cold water
connection.
NOTE
There may be some hot water, risk of scalding.
DRAINING THE CLIMATE SYSTEM
In order to carry out service on the climate system, it may
be easier to drain the system first. This can be done in differ-
ent ways depending on what needs doing:
NOTE
There may be some hot water, risk of scalding.
57Chapter 10 | ServiceNIBE S1255
Service
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