IDEAL istor HE260, Установка и обслуживание, Страница: 68 / 80

68
istor system store -
Installation and Servicing
FAULT FINDING
F
AUL
T FINDING F
AUL
T FINDING F
AUL
T FINDING F
AUL
T FINDING F
AUL
T FINDING
102 H.....2..... (RETURN TEMPERATURE SENSOR)
103 H.....3..... (DHW TEMPERATURE SENSOR)
YES
Is there continuity between the PCB
and the thermistor ?
Check resistance. The sensors can be checked by
measuring their resistance, using a suitable multimeter
connected across the sensors' 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
Remove the boiler return
thermistor from the CH
return pipe.
Are the thermistor values correct ? Replace the thermistor
NO
YES
Replace PCB
Check and replace wiring
as necessary
NO
YES
Is there continuity between the PCB and
the thermistor ?
Check resistance. The sensors can be checked by
measuring their resistance, using a suitable multimeter
connected across the sensors' 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
Remove the boiler DHW
thermistor from the DHW
cylinder and disconnect
thermistor wires.
Are the thermistor values correct ? Replace the thermistor
NO
YES
Replace PCB
Check and replace wiring
as necessary
NO