Weil-McLain GV90+ - CHART 4 FLAME & POWER lights flashing

Part number 550-142-903/1016
86
CHART 4
FLAME & POWER lights flashing
%LECTRICALSHOCKHAZARD — Wherever you see TURN OFF POWER, follow the instructions. Failure to follow
instructions could result in severe personal injury, death or substantial property damage.
s Open manual gas valve.`
s Restart boiler, following Operating instructions on boiler
(see Figure 76, page 67).
s Check for proper operation (per normal sequence of
operation).
s Boiler should now operate normally.
s Original flashing &,!-% light caused by igniter not
operating properly.
s See normal sequence of operation (Figure 75, page 66).
s Boiler should now operate normally.
s Original flashing &,!-% light caused by gas valve not
operating properly.
s See normal sequence of operation (Figure 75, page 66).
s Replace IBC.
s Retest.
s Call your local Weil-McLain
sales representative.
Are manual main shutoff valve and gas valve turned on?
No Yes
s Check gas valve harness wires and check for tight wiring connections
on gas valve and IBC. Repair/replace as necessary.
s Recycle boiler by thermostat or service switch (holding power off for
at least 45 seconds).
s Thermostat should call for heat and appropriate zone valves close.
During step 5 of normal sequence of operation (Figure 75, page 66),
is there 6!# across gas valve terminals?
No Yes
s 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.
s 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.
s Wait 5 minutes.
Are &,!-% & 0/7%2 lights flashing?
No Yes
s 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.
s Wait 5 minutes.
Are &,!-% & 0/7%2 lights flashing?
No Yes
GV90+ Series 2 GAS-FIRED WATER BOILER — Boiler Manual
Troubleshooting (continued)