Part number 550-143-010/1021
86
GV90+
series
2
gas-fired water boiler – boiler manual
CHART 4
FLAME & POWER lights flashing
Electrical shock hazard
— Wherever you see TURN OFF POWER, follow the instructions. Failure to fol
-
low instructions could result in severe personal injury, death or substantial property damage.
•
Open manual gas valve.`
•
Restart boiler, following Operating instructions on boiler
).
•
Check for proper operation (per normal sequence of
operation).
•
Boiler should now operate normally.
•
Original flashing
FLAME
light caused by igniter not
operating properly.
•
See normal sequence of operation (
).
•
Boiler should now operate normally.
•
Original flashing
FLAME
light caused by gas valve not
operating properly.
•
See normal sequence of operation (
).
•
Replace IBC.
•
Retest.
•
Call your local Weil-McLain
sales representative.
Are manual main shutoff valve and gas valve turned on?
No
Yes
•
Check gas valve harness wires and check for tight wiring connections
on gas valve and IBC. Repair/replace as necessary.
•
Recycle boiler by thermostat or service switch (holding power off for
at least 45 seconds).
•
Thermostat should call for heat and appropriate zone valves close.
During step 5 of normal sequence of operation (
Is there
24 VAC
across gas valve terminals? (19-21 VDC)
No
Yes
•
Remove inducer/gas valve assembly. Clean burner cone insuring no
debris is in between inner and outer cone. Remove gas manifold from
gas valve and inducer. Run a small wire through manifold to remove
spider webs. Check gas entry hole in bottom of inducer for possible
debris or bugs and clean thoroughly.
•
Check and/or replace igniter, if cold resistance is not between 40-75
ohms.
•
Recycle boiler by thermostat or service switch. Thermostat should
call for heat and appropriate zone valves close.
•
Wait 5 minutes.
Are
FLAME
&
POWER
lights flashing?
No
Yes
•
Check and/or replace gas valve. Gas valve energizes with 19-23 VDC.
•
Recycle boiler by thermostat or service switch. Thermostat should
call for heat and appropriate zone valves close.
•
Wait 5 minutes.
Are
FLAME
&
POWER
lights flashing?
No
Yes
Troubleshooting
(continued)