ENGINEMAN  1  &  C Symptom or   Difficulty Ignition failure Flame failure Burner smokes  or pulsates Oil  pump fails   to deliver Condition   may   be   due   to Faulty   transformer. Broken  or  grounded  high  tension leads. Cracked   high   tension   electrode insulator. Carbon   deposits   on   electrodes or   insulators. Incorrect    electrode    setting. Malfunctioning   programing   con- trol   cams. Faulty  ignition  cable  connector. Solenoid  oil  or  air  valve  fails  to open. Water  in  the  oil. Dirty  or  clogged  burner  tip. Dirty   glass   in   the   photocell. Abnormal   ambient   temperature. Bad  electron  tube  in  the  photo- cell. Damaged    photocell. Faulty  electron  tube  in  the  com- bustion   safeguard   control. Loose   connection   on   the   photo- cell. Out  of  oil  or  have  water  in  the oil. Clogged  fuel  oil  nozzle. Clogged  fuel  oil  line  or  strainer. B r o k e n    p r e s s u r e    r e g u l a t o r spring. Faulty   solenoid   valve. Broken   belt   (V-belt   drive). Dirty  nozzle. Excessive  return  line  oil  pres- sure   (return   flow   system). Nozzle   not   positioned   correctly. Insufficient   air   for   combustion. Low  oil  pressure. Incorrect   burner   linkage   set- ting. Incorrect   setting   of   primary   air. Low   voltage   (d-c   machinery). Fluctuating  voltage. Leak  in  the  suction  line. Insufficient  fuel  in  the  tank. Clogged   or   dirty   strainers. Worn   pump   members. Symptom or   Difficulty Oil  pump fails   to deliver (continued) Blower   fails to   deliver Feed  pump fails   to deliver Excessive vibration Condition   may   be   due   to Improper  oil  relief  valve  set- ting. Defective  gasket  on  the  oil  pump. Leaky   pump   seal. Slipping  V-belts. Driver  pulley  loose  on  the  shaft. Misalignment. Dirty   fan   blades. Restriction   at   the   blower   inlet. Seized  bearings  in  the  blower  or the  blower  drive. Bent   or   broken   shaft. Dirty   air   inlet   screen. Insufficient supply voltage to motor   (d-c   machinery). Fluctuating   voltage. Dirty   suction   strainer. A b n o r m a l l y    h i g h    w a t e r    t e m - perature. Leak  in  the  suction  line. Pump   packing   gland   leaks   badly. Plugged   inlet   piping. Excessive   discharge   head. Slipping   or   broken   drive   coup- ling. Jammed   pump   impeller. Dirty  water  level  relay  contacts (electrode    -    probe    type    con- trol). Malfunctioning   pump   time   delay relay.  Grounded  water  probes (electrode   -   probe   type   con- trol). Pump   vapor   locked. Insufficient   water   supply. Reversed    rotation. Wornout   impeller. Defective   water   pressure   gage. Combustion   pulses. Loose   hold-dorn   bolts. Badly   worn   bearings. Insufficient  air  to  the  burner. Loose   mechanical   fastings. Misalignment   of   rotating   auxil- iaries. Dynamic   unbalance   of   rotating auxiliaries. Figure  7-2.—Troubleshooting  guide—auxiliary  boilers. 7-8 121.21