53
Fault Finding
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combi
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Installation and Servicing
75 aLTERNaTINg ‘F’ aND ‘4’ - FLOW ThERMIsTOR FaULT
Check the resistance using a suitable multimeter
connected across the thermistor’s terminal pins.
At 25
o
C expect
9,700 - 10,300
Ohms
At 60
o
C expect
2,400 - 2,600
Ohms
At 85
o
C expect
1,000 - 1,100 Ohms
Is the Thermistor value correct?
Is there continuity between the PCB and
the Thermistor?
Fit a new Thermistor
NO
Check and replace
wiring as necessary
76 aLTERNaTINg ‘F’ aND ‘5’ - RETURN ThERMIsTOR FaULT
YES
NO
YES
Replace PCB
Check the resistance using a suitable multimeter
connected across the thermistor’s terminal pins.
At 25
o
C expect
9,700 - 10,300
Ohms
At 60
o
C expect
2,400 - 2,600
Ohms
At 85
o
C expect
1,000 - 1,100 Ohms
Is the Thermistor value correct?
Is there continuity between the PCB and
the Thermistor?
Fit a new Thermistor
NO
Check and replace
wiring as necessary
YES
NO
YES
Replace PCB
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