In most cases, S1155 notes a malfunction (a malfunction
can lead to disruption in comfort) and indicates this with
alarms, and instructions for action, in the display.
Info-menu
All the heat pump's measurement values are gathered
under menu 3.1 (Operating info) in the heat pump' menu
system. Examining the values in this menu can often
make it easier to identify the source of the fault.
Manage alarm
I want to see more info about the alarm
I want to change settings for my system
Your system has an active alarm.
Please select action or contact your installer.
12°C 13.45 3 October
12°C 13.45 3 October
Reset alarm and try again
Start auxiliary mode
The installation has no contact with the outdoor temperature sensor. Calculated
supply temperature is set to min. supply. If a higher temperature is desired,
then min. supply line can be temporarily changed in menu 1.30.4. Check the
connection in the outdoor temperature sensor and reset the alarm. If the alarm
recurs, select auxiliary mode and contact your installer.
In the event of an
alarm, a malfunction
has occurred and the
status lamp shines
with a steady red
light. You receive in-
formation about the
alarm in the smart-
guide on the dis-
play.
ALARM
In the event of an
alarm with a red
status lamp, a mal-
function has occurred that S1155 cannot remedy itself.
On the display, you can see what type of alarm it is and
reset it.
In many cases, it is sufficient to select “Reset alarm
and try again” for the installation to revert to normal
operation.
If a white light comes on after selecting “Reset alarm
and try again”, the alarm has been remedied.
"Auxiliary operation" is a type of emergency mode. This
means that the installation attempts to produce heat
and/or hot water, even though there is some kind of
problem. This could mean that the heat pump’s com-
pressor is not in operation. In this case, any electric ad-
ditional heat produces heat and/or hot water.
Caution
To select "Auxiliary operation", an alarm action
must be selected in menu 7.1.8.1 – "Alarm ac-
tions".
Caution
Selecting "Auxiliary operation" is not the same
as correcting the problem that caused the
alarm. The status lamp will therefore remain
red.
Troubleshooting
If the operational interference is not shown in the display
the following tips can be used:
Basic actions
Start by checking the following items:
• Group and main fuses of the accommodation.
• The property's earth circuit breaker.
• Miniature circuit breaker for S1155 (FC1).
• Temperature limiter for S1155 (FQ10).
• Correctly set load monitor (if current sensors installed).
Low hot water temperature or a lack of hot
water
This part of the fault-tracing chapter only applies if the
water heater is installed in the system.
• Closed or choked filling valve for the hot water.
– Open the valve.
• Mixing valve (if there is one installed) set too low.
– Adjust the mixer valve.
• S1155 in incorrect operating mode.
– Enter menu 4.1. ("Operating mode"). If "auto" mode is se-
lected, select a higher value for "stop additional heat" in
menu 7.1.10.2.
– If "manual" mode is selected, select "additional heat".
NIBE S1155Chapter 11 | Disturbances in comfort66
11 Disturbances in comfort
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