Worcester 24i RSF Installation And Servicing Instructions page 30

Thermistor Check
Remove connectors
from thermistor
YES
Is resistance between
NO
terminals of thermistor
between 690ohms & 33k?
YES
Thermistor OK
Harness Continuity Check
Remove appropriate
connectors
YES
Is continuity observed
NO
between each end of
wire in question?
YES
Harness OK
Harness Short Check
Remove appropriate
connectors
YES
Is short circuit
NO
observed between pair
of wires in question?
YES
Harness OK
Supplied By www.heating spares.co Tel. 0161 620 6677
Faulty thermistor
Faulty harness
or connector
Faulty harness
30