Weil-McLain EGH-105, EGH-125 manual VIII Check-outprocedure - troubleshooting, Secure connections

EGH-105 to EGH-125 Control Supplement

VIII Check-out procedure — troubleshooting

TS-2: No Spark — System (boiler with vent damper) does not work

			Secure connections.		Is damper harness securely plugged in at both ends?
					No		Yes
	Check for loose wire connections or bad relay on
	transformer.				Is 24VAC present across transformer terminals C & Y?
					No		Yes
Check for open thermostat, circulator relay, operating
control, limit control or LWCO. Check the CSD-1 control
					Is 24VAC present across terminal C and yellow wire on
panel, impulse relay and push-button switch.
					damper connector?
		If limit controls or water level controls
					No		Yes
		lockout on manual reset, determine cause
		and correct condition. Failure to do so could
		result in severe personal injury, death or
						Is damper rotated open?
		substantial property damage.
					No		Yes
Check for out of round stack section. Does motor rotate
open?					Is 24VAC present across terminals PV and MV/PV?
	No			Yes
					No		Yes
	Replace actuator.
						Is spark present now?
	Retest.
					No		Yes
	Open thermostat contacts for 30 seconds. Damper will
							Retest.

rotate to closed position. Close thermostat contacts.

Damper will rotate to open position. Is 24VAC present

Turn OFF supply voltage.

across terminals PV and MV/PV?

Electrical shock hazard. Failure to turn off

No

Yes

power before proceeding could cause

severe personal injury or death.

Check continuity of each wire in wiring harness to

Securely connect

Check spark wire. Is it securely

connected to ignition control?

damper. Does continuity exist for each wire?

and turn ON supply

voltage. Retest.

No

Yes

No

Yes

Replace damper

Remove damper harness from

Is condition of spark wire good

wiring harness.

(not brittle, burned or cracked)?

boiler wiring harness.

Replace pilot

Retest.

TEMPORARILY install jumper

assembly. Retest.

No

Yes

between terminal 2 and

Replace ignition

terminal 5 on damper plug in

control. Retest.

boiler wiring harness. See

Is spark gap 0.125" and

Is spark electrode

figure below. Does boiler fire?

located in pilot gas stream?

ceramic cracked?

No

Yes

No

Yes

No

Yes

Replace pilot

Replace ignition

Replace

pilot

1

2

3

assembly.

control. Retest.

assembly.

Temporary

jumper

Replace damper

Turn ON supply voltage and operate

4

5

6

actuator. Retest.

system several complete cycles.

28 Part Number 550-110-677/0299