PVI Industries B40 User Manual

A.  Oil nozzle size too small. Remove nozzle 

and check marking.  Replace with correct size 
nozzle. 

 
B.  Nozzle defective. Replace. Nozzle mesh filter 

(if supplied) dirty. Clean or replace. 

 
C.  Oil supply pressure to nozzle too low. 

Readjust. 

 
D.  Oil pump defective. Replace. 
 
E.  Oil pump coupling loose (slipping)  or 

defective. Replace. 

 
F.  Linkage mechanically binding. Readjust. 
 
G.  On modulating burner, oil nozzle return line 

metering valve set incorrectly.  Readjust to 
attain required nozzle bypass pressure.

 

 
 
H.  Oil suction line too small or partially 

blocked.  Make vacuum test while at high fire. 
The vacuum should not exceed 10-15 inches 
Mercury (HG). Make line size changes, if 
required. 

 
I. 

Blocked or dirty suction line oil filter. 
Replace or clean. 

 
J.  Manual valves in suction line not fully open. 

Check and correct. 

 
K.  Suction  line check valve or foot valve 

operating incorrectly. Check and correct. 

 
L.  Vent system on oil tank blocked, creating 

vacuum on tank with high vacuum and 
lowered oil flow to burner. Check and correct. 

 
 

Additional troubleshooting information can be found in the Flame Safeguard bulletin supplied with the burner.