Exhausto EXact2 VEX240 series, Basic Instructions

Page: 97 / 108

MCOCW Alarm
Device
Fault code
Category
Alarm description
Troubleshooting
(See appendix 1: "Simplified diagrams" for the positioning of dampers,
sensors, air directions, etc.)
xx yy z
47 12 3 Return water temp.
measured by external
sensor becoming too
low. VEX/CX tempora-
rily stopped. HCW:
● Check that the hot water supply to the heating coil is function-
ing.
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 heat retention level.
47 13 4 Max. total no. of re-
starts within one hour
reached. HCW:
● Check that the hot water supply to the heating coil is function-
ing.
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 heat retention level.
47 14 4 Could not increase re-
turn water temp. within
five minutes after frost
protection with VEX/CX
stopped. HCW:
● Check that the hot water supply to the heating coil is function-
ing.
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 heat retention level.
3005167-2022-02-02
Alarms
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