Blodgett BLP-G Series - Manual (Page 18)

18 OM-BLT/BLP-G
Troubleshooting
B. STANDARD MODELS WITH ELECTRONIC IGNITION SYSTEM (REFER TO SCHEMATIC)
SYMPTOM WHO WHAT TO CHECK
(X indicates work that should only be performed by a qualified service representative)
System does not produce
a spark. Authorized
Service Rep Only
a. Thermostat, and close the contacts if they are open X
b. AC voltage between terminals on secondary side of transformer.
If it is not 24 Volt, replace the transformer X
c. That the high tension cable is in good condition. If cracked or
brittle, replace. X
d. Pilot electric ceramic for crack or break. X
e. Pilot spark gap. Regap. X
Spark is present but the
pilot will not light. Authorized
Service Rep Only
a. That the pilot valve is securely connected to terminals. X
b. For 24 VAC at terminals PV and to ground. If 24V is not present,
replace the ignition control module. X
b. That gas pressure is at least 3.5” W.C.(8.7millibars). X
c. For gas at the pilot. If it is not flowing:
(1) Check the pilot gas line for kinks and obstructions. X
(2) Clean orifice, if necessary. X
(3) Check solenoid operation pilot valve on gas valve. Repair or
replace as necessary. X
d. That the pilot spark gap is located in the pilot gas stream. If not,
adjust or replace the pilot burner. X
e. For drafts. Shield the pilot burner, if necessary. X
Pilot lights, but main
burner will not come on
and spark does not stay
on. Authorized
Service Rep Only
a. Check operating thermostat to see that it is closed at temperature
setting higher than that of the current pan temperature. X
b. For 24 V between terminals MV and to ground. If 24V is not
present, replace the ignition control module. X
c. That gas pressure is at least 3.5” W.C.(8.7millibars). X
d. Electrical connections of the main valve to terminals, to assure
that they are securely attached. Check solenoid operation for
main valve on gas valve. Repair or replace as necessary. X
e. That secondary thermostat switch is closed.X
Pilot lights, but main
burner will not come on,
the spark stays on. Authorized
Service Rep Only
a. Check for improper grounding. If necessary, repair with high
temperature wire. X
b. Pilot burner ceramic insulator for cracks. X
c. That high tension cable is not grounded out. If it is, correct the
ground-out condition or the pilot burner. X
d. For proper gas pressure. X
e. Clean pilot assembly, or replace if necessary. X
f. Tighten all mechanical and electrical connections. X
g. Replace ignition control module. X
Main burner comes on
but will not stay on. Authorized
Service Rep Only
a. Check burner ground for bad wire or connection. Replace if
necessary with high temperature wire. X
b. Check for low gas supply pressure. If necessary, replace ignition
control module. X