6. Settings and troubleshooting
6.1 Troubleshooting
Most terminal connections are monitored for proper operation. LED lights indicate operating status. If a light is lit, it indi-
cates everything is functioning properly while a light out indicates a problem on the circuit it monitors. In addition, fault
codes are shown on the display.
The fault codes are:
Display Explanation
A1 Exhaust Draft Alarm Insucient draft pressure. Can be caused by:
1. Chimney fan does not have enough capacity
2. Mechanical or electrical fan failure
3. Blocked chimney
4. Introduction of excessive dilution air
5. XTP sensor not responding correctly
A2 Power Fault Indicates there has been a power fault
A3 Exhaust Error Indicates a disconnected signal from the XTP-Sensor on the exhaust side to the control Can be
caused by:
1. Loose connections
2. Faulty XTP-sensor
3. Faulty controller
A4 Start Alarm
Indicates that the control has not been able to release the heating appliance(s) within 15 min-
utes.
A5 Alarm Override Indicates alarm has been ignored
A6 Draft Alarm Missing signal from PDS-function. Indicates a faulty function.
A7 RS485 error Communication erro between MEC24 and a MODBUS unit
A8 Priority The draft has been insucient and therefore the control has gone into Priority mode
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3120066 MEC24 US 20210325
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