Weil-McLain Boiler - Manual (Page 28)

8 Part Number 550-110-646/0607
EG • PEG • EGH Series 4
Troubleshooting
continued
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 Yes
Is 24VAC present across Terminals 24V & 24V(GND)?
No Yes
Correct by making connections.
Check for open thermostat or circulator relay
(where used) or check for loose wire con-
nections, defective spill switch or rollout
thermal fuse element, or open LWCO or limit
contacts.
If LWCO, spill switch or rollout
thermal fuse element contacts
are open, determine cause and correct con-
dition. Failure to do so will cause severe per-
sonal injury, death, or substantial property
damage.
Open thermostat contacts for 15 seconds. Close thermo-
stat contacts - is 24 VAC across terminals PV & MV/PV?
No Yes Replace ignition control.
Turn OFF supply voltage.
Check spark wire. Is it securely connected
to spark transformer?
No Yes Securely connect, then turn ON supply voltage and re-test.
Replace pilot assembly.
Is condition of spark wire good (not cut,
brittle, burned, or cracked)?
No Yes
Is spark electrode ceramic cracked?
No Yes Is spark gap 0.125” and located in pilot gas steam?
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. Replace ignition control.
Is the vent damper
plug in place?
No Yes
Replace damper
plug and retest.
CHART 1: NO SPARK — System does not work — Without vent damper