Baxi Combi 130 HE Installation And Servicing Instructions page 54

15.0 Fault Finding
Flow Thermistor
Unplug
NO
thermistor, is thermistor Replace Flow
resistance between
Thermistor.
0.5kΩ & 20kΩ ?
YES
Plug
in thermistor,
YES
Wiring from Main PCB
unplug 7-way molex, is
to Flow Thermistor
resistance measured at E
between 0.5kΩ
faulty.
& 20kΩ ?
F
E
NO
Molex
Replace Main PCB.
Return Thermistor
Unplug
NO
thermistor, is thermistor Replace Flow
resistance between
Thermistor.
0.5kΩ & 20kΩ ?
YES
Plug
in thermistor,
YES
Wiring from Main PCB
unplug 7-way molex, is
to Flow Thermistor
resistance measured at F
between 0.5kΩ
faulty.
& 20kΩ ?
NO
Replace Main PCB.
54
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