Weil-McLain PFG 7 Series User Manual download pdf (Page 14)

Part Number 550-110-031/1112

EGH-85 & 95 Series 4 & 5 and PFG-6 & 7 Series 6 & 7

Troubleshooting continued

Is 24VAC present across transformer terminals C & Y?

Is damper harness securely plugged in at both ends?

Secure connections.

Check for open thermostat, LWCO, or high limit contacts

or check for loose wire connections.

If LWCO, contacts are open, determine

cause and correct condition.

Failure to do so will cause severe personal

injury, death or substantial property

damage.

Check/repair out of round stack section. Does vent damper

rotate open?

Is 24VAC present across transformer terminal C and yellow

wire on vent damper connector?

Is 24VAC present across gas valve terminals?

Open thermostat contacts for 30 seconds. Vent damper will

rotate to closed position. Close thermostat contacts. Vent

damper will rotate to open position. Is 24VAC present

across gas valve terminals?

Remove damper harness from

damper harness plug.

TEMPORARILY install jumper

between terminal 2 and

terminal 5 on damper plug in

boiler wiring harness. See

figure, right. Does boiler fire?

No Yes

Chart 1: Boiler will not fire - boilers without tankless

Check for loose wire connections or bad relay on

transformer.

No Yes

Is vent damper rotated open?

Yes

No Yes

Replace actuator.

Retest.

Check continuity of each wire in damper harness. Does

continuity exist for each wire? See Table below.

Replace damper

wiring harness.

Retest.

Replace gas valve.

Retest.

Is main flame on now?

No Yes

Retest

No Yes

Yes

No Yes

Replace damper

actuator. Retest.

Turn gas valve cock to

ON position. Retest.

Replace gas valve.

Retest

Is gas valve cock turned to ON position?

Yes

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Weil-McLain PFG 7 Series User Manual Page 14

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