51
FAULT FINDING
F
AUL
T FINDING F
AUL
T FINDING F
AUL
T FINDING F
AUL
T FINDING F
AUL
T FINDING
isar -
Installation and Servicing
82 H.....2..... (CONTROL THERMISTOR [RETURN] ERROR)
YES
Is there continuity between the
PCB and the thermistor ?
Remove the boiler return thermistor from the
CH return pipe.
Are the thermistor values correct ?
Replace the thermistor
NO
NO
YES
Replace PCB
Check and replace wiring as necessary
83 H.....3..... (DHW THERMISTOR ERROR)
YES
Is there continuity between the
PCB and the thermistor ?
Remove the boiler DHW thermistor from the plate
heat exchanger and disconnect thermistor wires.
Are the thermistor values correct ?
Replace the thermistor
NO
NO
YES
Replace PCB
Check and replace wiring as necessary
Check 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
Check 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
Содержание isar m30100
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