P
A
R
T
IV
: MAIN
TENANCE
35
TROUBLESHOOTING
CAUSE
TROUBLE
THE BURNER
DOESN’TSTA
R
T
CONT
INUE WITH PRE-
P
URGE
DOESN’T START AND
LO
CK-
OUT
DOESN’T START AND
RE
PEA
T
S
THE
CYCLE
S
T
ARTS AND
REP
EATS
THE
CY
CLE
S
T
ARTS AND
LOCK-OUT
THE FLAME
MONI
TO
R
DE
VIC
E
DOESN’T
G
IV
E
CONS
ENT TO
START
DOESE
N’T
SWITC
H
T
O
HIGH
FLAME
DOESE
N’T
RETURN
IN LOW
FLAME
LO
CK-OUT DURING
O
PERA
T
IO
N
TTURNS OF AND
REP
EATS
CY
CLE DU
RING OP
ERATION
MAIN SWITCH OPEN
z
LACK OF GAS
z
z
MAXIMUM GAS PRESSURE SWITCH DEFECTIVE
z
z
THERMOSTATS/PRESSURE SWITCHES DEFECTIVES
z
z
z
OVERLOAD TRIPPED INTERVENTION
z
AUXILIARIES FUSE INTERRUPTED
z
DEFECTIVE CONTROL BOX
z
z
z
z
z
DEFECTIVE ACTUATOR
z
z
z
AIR PRESSURE SWITCH FAULT OR BAD SETTING
z
z
z
z
MINIMUM GAS PRESSURE SWITCH DEFECTIVE OR GAS
FILTER DIRTY
z
z
z
z
z
IGNITION TRANSFORMER FAULT
z
IGNITION ELECTRODES BAD POSITION
z
BUTTERFLY VALVE BAD SETTING
z
z
DEFECTIVE GAS GOVERNOR
z
z
z
z
GAS VALVE DEFECTIVE
z
BAD CONNECTION OR DEFECTIVE HIGH/LOW FLAME
THERMOSTAT OR PRESSURE SWITCH
z
z
ACTUATOR CAM WRONG SETTING
z
z
z
UV PROBE DIRTY OR DEFECTIVE
z
z
z
