AIC TMU 500, Руководство по установке и обслуживанию, Страница: 62 / 68

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Troubleshooting
In case of any other troubles, please contact your AIC representative.
Problem Cause(s) Solution(s)
Appliance does not start No power supply
1. Check that the power button is in ON
position (pushed in and illuminated)
2. Make sure the power supply cable is
connected to the mains
3. Check the external power supply box
(circuit breaker) and reset it as required.
Appliance display remains blank
No power supply
1. Check wiring connection.
2. Check wiring continuity.
3. Replace wiring.
Main board fuse(s) blown
Replace blown fuse(s) on electronic board
(T6 3AH 250V).
Circulating pump does not start
Pump power supply
1. Check wiring connection.
2. Check wiring continuity.
3. Replace wiring.
Relay malfunction
1. Check the relay.
2. Replace the electronic board.
Pump malfunction
1. Reset the pump.
2. Check if there is voltage at the pump. If
there is, replace the pump.
Temperature too high compared to
setpoint
Appliance controller malfunction
1. Check temperature setpoint.
2. Check controller operation.
3. Check position of temperature sensors.
Heat exchanger reaches temperature
setpoint but water flowing out is cold
Air in the system Bleed the air present in the heating system
Circulating pump malfunction
1. Check if circulating pump is running
2. Check pump wiring connection and
continuity.
3. Reset pump
4. Check if there is voltage at the pump. If
there is, replace the pump.
Safety valve opens frequently
System safety valve
Check pressure rating of the safety valve
(suitable to the system pressure).
Pressure in the water circuit
Check the pressure in the system (max. 6
bar).
Expansion tank
Check the expansion tank size and opera-
tion.