4 Troubleshooting (Quick Diagnosis)
Troubleshooting is facilitated
by
using the testing device {see sect. 7.2).
Heater
shuts
down
in
its
'fault
lock
out'
mode (applies only to HL 24/32 if equipped with el. control unit
SG
1561)
NO
Switch
on
heater
I
Is operation Indicator
H1
Check electric leads, operation indicator
H1
and
tusesF1
Illuminated?
I
YES
Is voltage okay
(.: 10,SV,wlththeengine
switched off, measured at
---
Charge battery
battery during glowing period)?
I
Is fuse
F2
okay?
Check electric leads
for
earth connection Check glow plug
Replace
fuse
F2
I
I
la tuaeF1 okay? Check drive unit end electric leads
toreanh
connection and short circuit
Raplace fuaa
F1
I
lsglawplugoparatlng Checkeleclrlc leads and connections
tor
I- Check
glow
plug
Checkelectrlcal
property? nterruptlona
conlrolunlt
I
la metering pump cycling
~
Stan-up la Interrupted due
to
fault lock-out Check flame detector and alecfrlc leads
for
earth
(after 30 aac.
of
preheating)
connection and ahort
circuit
properly?
Start-up continues, Check aafety Check
Check Check
-
metering pump fall a
to
-
thermostat and
-
safety
electronic
metering
-
-
cycle
elactrlcleada
switch
control
pump
unit
I
la drive unit operating? Check drive
unit
and electric leads
I
11
axhauat pipe getting hot
Metering pump
Empty
tank
Check fuel
llnetor
Check metering
(=
combustion In heater)?
- -
........
-
falls
to
supply fuel
kinks and leaks
pump with damper
Check exhaust pipe and combustion air llnea
Check fuel ayatam Integration
-
tor
unabatructed paaaage
(suction height, unrlarpreuure
In
tank).
Observe Installation
lnatructlona.
I
Doesglowplugahut off within
-
Check
flamadetactOr(-aact.
6.1.7)
Uleeafetytlme(90aec,)?
andetec:trtc
leadl
I
H Checkdellvaryrataofmetarlngpump
Does
heater 1hut down In Its
H Check C01 value and adjust, replace
drive
unit,
If
nec-ry
fault lock-out mode after 1hort
heating
operation (flame
fellure)?
H Checkpan-load19Slllor
Drlveunltllhutadown
Metering pumpcontlnueatocycle
Part-load 19Slator
not
In•
-
Drlvent111111181operatlonand
healeratanaup
again
-
stalled
or
not
connected
Heater alluta down again
10
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