Weil-McLain EGH-105 Control Supplement page 27

VIII
Check-out procedure — troubleshooting
TS-1: No Spark — System (boiler without vent damper) does not work
Correct by making connections.
Check for open thermostat, circulator relay, operating
control, limit control or LWCO. Check the CSD-1
control panel, impulse relay and push-button switch.
If limit controls or water level controls
lockout on manual reset, determine
cause and correct condition. Failure to
do so could result in severe personal
injury, death or substantial property
damage.
Replace ignition control. Retest.
Securely connect spark wire. Then turn ON supply
voltage. Retest.
Replace pilot assembly. Retest.
Is spark gap 0.125" and isolated in pilot gas stream?
No
Replace pilot assembly,
turn ON supply voltage.
Operate system several
complete heat cycles.
Part Number 550-110-677/0299
CSD-1 control system — Natural gas
Yes
Replace ignition
control. Retest.
VISUALLY CHECK — Is ground wire connected from
GND (Burner) to ignition control mounting screw, and
ground wire connected from transformer terminal C to case
ground?
No
Is 24VAC present across terminals 24V and 24V(GND)?
No
Open thermostat (or operating control) contacts for 15
seconds. Close thermostat contacts. Is 24VAC across
terminals PV & MV/PV?
No
Turn OFF supply voltage.
Electrical shock hazard. Failure to turn off
power before proceeding could cause
severe personal injury or death.
Check spark wire. Is it securely connected to spark
transformer?
No
Is condition of spark wire good (not cut, brittle, burned or
cracked)?
No
Is spark electrode ceramic cracked?
No
Replace pilot assembly, turn ON supply voltage, operate
system several complete heat cycles.
Yes
Yes
Yes
Yes
Yes
Yes
27