Meaning Of The Leds; Troubleshooting Guide - Atag Mixed heating circuit module II Manuel D'installation

GB
preparing the boiler for operation

Meaning of the LEDs

GREEN LED (left)
Indicator light off
Indicator light on
Indicator light flashing
GREEN LED (centre)
Indicator light off
Indicator light on
Indicator light flashing
RED LED (right)
Indicator light off
Indicator light on

Troubleshooting guide

The Mixed heating circuit modules II and III are protected against the risk of breakdown by internal checks carried out by the PCB which, if
necessary, will activate a safety shutdown.
The table below shows the possible error codes, their descriptions and the recommended action to be taken in each case:
Error code
7 0 1 Zone 1 heating flow temperature sensor fault
7 0 2 Zone 2 heating flow temperature sensor fault
7 0 3 Zone 3 heating flow temperature sensor fault
7 1 1 Zone 1 heating return temperature sensor fault
7 1 2 Zone 2 heating return temperature sensor fault
7 1 3 Zone 3 heating return temperature sensor fault
7 2 2 Zone 2 overheating
7 2 3 Zone 3 overheating
4 2 0 ATAG zone supply overload
14
Main supply OFF
Main supply ON
Main supply ON, operation in manual mode
No ATAG zone communication
ATAG zone communication present
ATAG zone communication initialisation
No operating faults
Presence of one or more operating faults
Description Recommended action
Check the connection of the sensor concerned.
Check the continuity of the sensor.
Replace the sensor if necessary.
Check the link and its connection to the "ST2" terminal block on the
module
OR Check the maximum heating temperature setting for Zone 2
(parameter 525).
Check the connection of the safety thermostat to the "ST2"
terminal block on the module.
Check the link and its connection to the "ST3" terminal block on the
module
OR Check the maximum heating temperature setting for Zone 2
(parameter 625).
Check the connection of the safety thermostat to the "ST3"
terminal block on the module.
A "BUS supply overload" error may appear when three or more
devices supplying power to the BUS are connected to the system.
Example: boiler + hydraulic module, etc. To avoid this risk, the
microswitch (1) on the electronic PCB of one of the connected
devices (not the boiler) must be switched from ON to OFF.
O N
1 2
O N
1 2