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Part number 550-142-054/0411
85
GV90+ gas-fired water boiler — Boiler Manual
Troubleshooting (continued)
CHART 5
FLAME & POWER lights flashing
Electrical 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.
• Open manual gas valve.`
• Restart boiler, following Operating instructions on boiler
(see Figure 76, page 66).
• 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 (Figure 75, page 65).
• Boiler should now operate normally.
• Original flashing FLAME light caused by gas valve not
operating properly.
• See normal sequence of operation (Figure 75, page 65).
• 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 connec-
tions 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 (Figure 75, page 65),
is there 24 VAC across gas valve terminals?
No Yes
• Check and/or replace igniter.
• 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.
• 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