60
Zehnder Eversky
21.7. List and meaning of alarms
No.
Display
Class
Time
Threshold
Action
Conditions
Causes
(There may be several causes)
8
Anti-freeze
protection
(if hot water
heating coil
option)
C
120s
The DI2 input must be in
the closed state "Fer" if
there is no fault, in the
open state "Ouv" if there
is a fault.
The contact of the anti-
freeze thermostat
connected to the DI2
input of the hot water coil
has detected a
temperature below +5°C
for more than 120s, the
unit is stopped and
restarts automatically
when the thermostat
goes back above +5°C.
The thermostat is of type
NC (Normally Closed).
The contact is closed
when the bulb
temperature is above
+5 °C and open when the
temperature is below
+5°C.
Thermostat THA:
- Incorrect setting
(factory setting = +5°C)
- Faulty
The water circulation pump does not
work.
3-way valve:
- Defective
- Poor electrical connection
- Poor airflow connection
The hot water generator does not work.
The wiring or connections are faulty.
15
Supply air
temperature
A
30s
50 °C
The supply air
temperature measured at
input AI1 has exceeded
the 50 °C threshold for
more than 30s. The
machine is stopped, the
alarm must be manually
acknowledged and the
temperature lowered in
order to restart the
machine.
The supply air temperature setting is
too high.
The supply air fan has stopped (VAS
fault) while the heating coil was running
at full capacity.
The PT1000 temperature sensor and/or
its cable are defective
The power solid state relay that
supplies the electric battery is faulty
(passing), and permanently supplies the
electric battery as soon as the fan unit
is powered up (fault presence (23)).
