Weil-McLain EGH-125 - Manual (Page 30)

EGH-105 to EGH-125 EGH-105 to EGH-125 EGH-105 to EGH-125 EGH-105 to EGH-125 EGH-105 to EGH-125
Control Supplement
Part Number 550-110-677/0299 30
Check-out procedure — troubleshooting
VIII
Are pilot valve wiring connections CORRECT and securely fastened?
Connect securely to terminal PV on ignition control and
terminal TR on main gas valve.
TS-3: Pilot lights — Main valve will not come on - continued from previous page
No Yes
Is inlet gas pressure at least 5.0" W.C. and not over 14"
W.C.?
Open pilot shutoff valve.
No Yes
Pilot assembly and ignition control must share common
ground with main burner. Nuisance shutdowns are often
caused by poor or erratic ground.
❏ Check for good metal-to-metal contact between pilot
burner bracket and main burner and between main
burner and burner rest.
❏ Check ground lead from GND (Burner) terminal on
ignition control to ignition control mounting screw and
from C on transformer to transformer case ground.
Make sure connections are clean and tight. If wire is
damaged or deteriorated, replace with No. 18 gauge
moisture-resistant, thermoplastic insulated wire with
105 °C minimum rating.
To check ignition system grounding (instruction for continuation of TS-3)
TS-4: Spark is present - pilot will not light (boiler with or without damper)
No Yes
Is pilot shutoff valve open?
No Yes
Contact gas supplier to
correct gas pressure.
Is gas present at pilot burner assembly?
Remove MV wire from ignition control. Use a
match taped to a long screwdriver or pilot
lighter rod and manually light pilot.
Make sure pilot shutoff valve is open, 24VAC is present to
pilot valve and pilot line is not kinked or obstructed. Check
for clean pilot orifice. If OK, replace pilot gas valve.
Is spark gap 0.125" and located in pilot gas stream?
No Yes
Replace pilot assembly. Block any draft around
boiler. Check for clean
pilot orifice.
Turn OFF supply voltage.
Electrical shock hazard. Failure to turn off
power before proceeding could cause
severe personal injury or death.