46
Fault Finding
mexico HE
-
Installation & Servicing
F
AUL
T FINDING F
AUL
T FINDING F
AUL
T FINDING F
AUL
T FINDING F
AUL
T FINDING
72 L.....F.......
(FLAME ERROR)
Check the ignition electrode and associated harness for:
continuity, visual condition
,
position
(Refer to Frame 55)
Are these functioning correctly ?
Check gas valve
wiring for continuity
yES
Check the detection electrode and
associated harness for:
continuity, visual condition, position
(
Refer to Frame 56
).
Replace as necessary.
If the boiler reset button is
pressed does the boiler ignite for
a short time then extinguish?
Is 200V DC supply available
at the gas valve ?
NO
yES
yES
Is gas pressure available at
the boiler inlet ?
Replace PCB
Check gas supply
and rectify fault
Replace gas
valve
NO
NO
73 L.....E...... or h.....E...... (BOARD ERROR)
Internal fault within the PCB
OK
Replace
PCB
Note.
Due to the wave form of the rectified voltage the reading will vary, depending on the type of meter used to measure the value (some may
measure the possible peak voltage of 339V). In general terms, a reading greater than 150V indicates that the correct voltage is supplied
to the gas valve. As an alternative to a multimeter a mains checking device may be used. E.g. an electrical screwdriver or a mains tester.
Check spark generator and associated
harness for continuity and visual condition.
Refer to Frame 57. Are these functioning
correctly?
Replace
spark generator
Replace ignition electrode and associated
harness as necessary
yES
NO
NO
NO
Press and hold reset
button for 2 seconds.
Does boiler operate
correctly?
Turn boiler off and wait for 5
seconds.Turn boiler on.
Does boiler operate correctly?
yES
NO
yES
NO
OK
Check syphon and
condensate drain
pipework for blockage
Check all earths for continuity.
Is continuity OK?
Correct Connection
hE ONLy:
Check earth wire is
connected to detection lead.
Is this correct?
Correct wiring or replace
detection lead
LE ONLy:
Check Continuity of OH thermostat.
Is this correct?
Correct wiring or replace
thermostat
Check for an excess voltage
between neutral and earth.
Is the value below 50V?
Check earth connection to the boiler. If value is still in
excess of 50V consult a qualified electrician to check
the household electrical supply and circuitry
yES
yES
yES
yES
NO
NO
NO
NO
NO
Summary of Contents for he15
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