User guide
21
12.0 FAULT FINDING
1 Should the ALARM indicator illuminate ‘ashing’ (red) instantly on power up, then the connections
‘Conn 4’have become loose or disconnected in transit or if the ALARM indicator is ‘ashing’ (red) and
the CALL indicator is (red), then ‘Conn 3’ or the thermostatic switch wires have become loose.
2 Should the ALARM indicator illuminate ‘ashing’ (red) during the call checking period then there is a
problem due to lack of water or air in the system.
3 Should the ALARM indicator illuminate ‘ashing’ (red) and the CALL light show (red) after heat is
applied then there is a problem due to lack of water ow. See Fault Finding chart.
NOTE: It may be necessary to t 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 satised. 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 95 612 708.
13.0 ALARM RESET
There are 3 steps to re-set 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 ow 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.