PART IV: MAINTENANCE
56
TROUBLE
S
HOOT
ING
CA
USE
TROUBLE
TH
E BUR
NER
DOESN
’T
START
CONTINUE WITH PRE
-
PURGE
DOESN
’T START AND
LOCK-O
UT
DOESN
’T START AND
REPEATS THE
CYCL
E
STARTS AND RE
PEATS
THE
CY
CLE
STARTS AND L
OCK-
OUT
TH
E FLAM
E M
ON
ITOR
DEVICE DOESN’
T
GIVECO
NS
ENT TO START
DOESEN’T S
WITCH
TO
HIGH
FLA
ME
DOESEN’T RE
TURN
IN
LOW FLAME
HE SE
RVO CONT
ROL IS
LOCK AND VIBRATE
LOCK-O
UT DURING
OPER
ATIO
N
TURNS OF
AND REPEATS
CYCLE DURING
OPER
ATIO
N
URNS
OF
AND REPEATS
CYCLE DURING
OPER
ATIO
N
URNS
OF
AND REPEATS
CYCLE DURING
OPER
ATIO
N
MAI
N
S
WIT
CH
OPE
N
z
L
A
C
K
OF GA
S
zz
MAX
IMUM
GAS
P
R
ESSURE
SW
ITCH DE
F
E
CT
IVE
(
IF
P
R
OV
ID
ED)
zz
TH
E
R
M
O
ST
ATS
/P
R
E
S
S
U
R
E SW
IT
C
H
E
S D
E
FEC
T
IV
E
zz
z
FAN MO
TO
R THERMAL CUT
OUT
INTERVENTIO
N
z
OV
ERLO
AD TRI
PPE
D I
N
TERVENTI
ON
z
z
AUX
ILIARY
FUSE
S INTERRUPTED
z
CONTROL
BOX
FAULTY
zz
z
z
z
DEFECTI
VE ACTUATOR
zz
z
z
AIR P
R
ESS
UR
E
S
W
ITCH
F
A
ULT OR BA
D S
E
TTING
zz
z
z
MINI
MUM
G
AS PRES
SURE SWI
T
C
H
DEFECTI
VE OR GAS
FIL
T
ER DIRTY
zz
z
z
z
IG
NI
TI
ON TRANSFORME
R
FAULT
z
IG
NI
TI
ON ELE
C
TRO
D
ES BA
D
PO
SI
TI
ON
z
B
U
TTE
R
F
L
Y
V
A
L
V
E BA
D
SE
TTI
N
G
zz
DEFECTIVE GA
S GOV
E
RNOR
zz
z
z
GA
S VAL
VE DEFECTIV
E
z
BA
D
CONNE
C
T
ION OR DEFECTIV
E HIGH
/LOW
FLA
ME
THERMOS
T
A
T
O
R
PRE
SSURE
SWI
T
CH
zz
z
W
R
O
N
G
SE
TTI
NG
A
C
TUA
T
OR
CA
M
zz
z
UV PROB
E DIRTY OR DEFECTIV
E
zz
z
OIL FIL
T
E
R
DIRT
Y
z
