Weil-McLain EGH-125 - Manual (Page 27)

CSD-1 control system — Natural gas
Part Number 550-110-677/0299 27
Check-out procedure — troubleshooting
VIII
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?
Correct by making connections.
Is 24VAC present across terminals 24V and 24V(GND)?
Replace ignition control. Retest.
Open thermostat (or operating control) contacts for 15
seconds. Close thermostat contacts. Is 24VAC across
terminals PV & MV/PV?
Securely connect spark wire. Then turn ON supply
voltage. Retest.
No Yes
Replace pilot assembly. Retest.
Is condition of spark wire good (not cut, brittle, burned or
cracked)?
No Yes
Replace pilot assembly, turn ON supply voltage, operate
system several complete heat cycles.
Replace pilot assembly,
turn ON supply voltage.
Operate system several
complete heat cycles.
No Yes
No Yes
Replace ignition
control. Retest.
TS-1: No Spark — System (boiler without vent damper) does not work
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.
Is spark gap 0.125" and isolated in pilot gas stream?
No Yes
Is spark electrode ceramic cracked?
No Yes
Check spark wire. Is it securely connected to spark
transformer?
No Yes
Turn OFF supply voltage.
Electrical shock hazard. Failure to turn off
power before proceeding could cause
severe personal injury or death.