22
12.0 FAULT FINDING
Indicator
Flashing /
Steady
Cause
Action
Alarm (Top)
Flashing Red
No Water
There is No water in the system, switch OFF imme-
diatly. Check and fill before restarting.
Alarm (Top)
Steady Red
Thermistor Fault
Check Conn 4 is connected properly on the Main
PCB.
Replace thermistor if necessary
Call (Bottom) Flashing Red
Over Tempera-
ture Switch
Check direction of flow through the boiler from the
pump. Heat output at the top, cold in at the bot-
tom. Turn pump if necessary.
Check Conn 3 is connected properly on the main
PCB.
Call (Bottom)
Steady Red
100°C Control
Trip
Check thermistor is mounted properly on the heat
exchanger.
If necessary change control PCB.
NOTE: It may be necessary to fit a capacitor between the ‘R’ run and ‘N’ neutral terminals on the control
connector to prevent the boiler continuing to run when the cylinder and the room thermostats are satisfied. This
is due to a leakage current from some manufacturers 3 port valves. The capacitor required is 0.47 micro-farads
suitable for 275 volts AC (X2 style). These capacitors are available from Heatrae Sadia part number 95 612 708.
13.0 ALARM RESET
There are 3 steps to reset a tripped condition: -
1
Switch “OFF” the electrical supply.
2
Correct the fault, check the system is full of water and set to the correct pressure (sealed systems) and
there is a good flow of water (i.e. all the valves are open).
3
Switch the supply back “ON”.
Ensure the customer fully understands the operation of the system.
The boiler must NOT be operated if it is known to have a fault. Switch off, and call a service engineer. (see p.32
for contact details)
