IDEAL he24 Installation And Servicing

62
FAULT FINDING
FAULT FINDING FAULT FINDING FAULT FINDING FAULT FINDING FAULT FINDING
Esprit - Installation and Servicing
92 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
91 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
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
90 H.....1..... (CONTROL THERMISTOR [FLOW] ERROR)
YES
Is there continuity between the PCB and the thermistor ?
Remove the boiler control thermistor from the CH
flow pipe 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

IDEAL he24 Specifications

General

Brand	IDEAL
Model	he24
Category	Boiler
Language	English