HC Alarm
Unit
Fault code
Category
Unit
Alarm description
Troubleshooting
(See appendix 1: "Simplified diagrams" for the positioning of
dampers, sensors, air directions, etc.)
xx
yy
z
14
10
3
Return water temp. too
low. Frost protection ac-
tivated. VEX temporari-
ly stopped
HCW:
●
Check that the hot water supply to the heating coil is
functioning
If the hot water supply is functioning, check if the motor
valve opens and the circulation pump is running.
●
Check by turning the unit to "OFF" in the user menu
and force start the motor valve and circulation pump
in specialist menu 8.3
The alarm resets automatically when the temperature
rises above the constant temperature level
14
11
3
Return water temp.
measured by external
sensor becoming too
low. VEX running in re-
duced mode
HCW:
●
Check that the hot water supply to the heating coil is
functioning
If the hot water supply is functioning, check if the motor
valve opens and the circulation pump is running.
●
Check by turning the unit to "OFF" in the user menu
and force start the motor valve and circulation pump
in specialist menu 8.3
The alarm resets automatically when the temperature
rises above the constant temperature level
14
12
3
Return water temp.
measured by external
sensor becoming too
low. VEX temporarily
stopped.
HCW:
●
Check that the hot water supply to the heating coil is
functioning
If the hot water supply is functioning, check if the motor
valve opens and the circulation pump is running.
●
Check by turning the unit to "OFF" in the user menu
and force start the motor valve and circulation pump
in specialist menu 8.3
The alarm resets automatically when the temperature
rises above the constant temperature level
14
13
4
Max. total no. of restarts
within one hour reached
HCW:
●
Check that the hot water supply to the heating coil is
functioning
If the hot water supply is functioning, check if the motor
valve opens and the circulation pump is running.
●
Check by turning the unit to "OFF" in the user menu
and force start the motor valve and circulation pump
in specialist menu 8.3
The alarm resets automatically when the temperature
rises above the constant temperature level
3004256-2014-09-10
Alarms
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