IDEAL isar HE24 User Manual

60
FAULT FINDING
FAULT FINDING FAULT FINDING FAULT FINDING FAULT FINDING FAULT FINDING
isar - Installation and Servicing
92 H.....4.... (DRY FIRE THERMISTOR ERROR)
Check wiring for continuity from the
PCB to the dry fire thermistor
Can the fault condition be reset by switching off
the mains supply to the boiler ?
Is the system filled and vented and all
isolation valves open ?
Is the pump operating correctly?
Ensure flow through system.
NO
Are thermistor values correct ?
Replace PCB
Replace thermistor
Fill and vent the
system and open all
isolating valves
YES
Are thermistor values correct ?
Inspect heat exchanger
for blockage or
damage in the
flueways. Clean or
replace as necessary
Replace thermistor
NO
94 H......n..... (PHASE REVERSAL ERROR)
Check wiring to the boiler for
reversed live and neutral
YES NO
YES
NO
93 H......F..... (FLAME DETECTION ERROR)
Replace flame detection electrode
Is there continuity between the 2 terminal pins ?
NO
YES
Remove flame detection electrode terminal from PCB
Replace PCB
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 dry fire 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
H9/L9 (HEAT EXCHANGER OVERHEAT)
Note.
With V9 Primary Control PCB, overheat LA/HA or H9/L9 when
reset will display 3 horizontal lines and will not attempt to refire
until the temperature in the heat exchanger drops below 50
o
C.
203319-3.pmd 27/03/2008, 08:1560

IDEAL isar HE24 Specifications

General

Brand	IDEAL
Model	isar HE24
Category	Boiler
Language	English