Boiler Manual - Weil-McLain

GV90+ gas-fired water boiler — Boiler ManualTroubleshooting (continued)CHART 5FLAME & POWER lights flashingElectrical shock hazard — Wherever you see TURN OFF POWER, follow the instructions. Failure to followinstructions could result in severe personal injury, death or substantial property damage.Are manual main shutoff valve and gas valve turned on?NoYes• Open manual gas valve.`• Restart boiler, following Operating instructions on boiler(see Figure 76, page 66).• Check for proper operation (per normal sequence ofoperation).• Check gas valve harness wires and check for tight wiring connectionson gas valve and IBC. Repair/replace as necessary.• Recycle boiler by thermostat or service switch (holding power off forat 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?NoYes• Replace IBC.• Retest.• Check and/or replace igniter.• Recycle boiler by thermostat or service switch. Thermostat shouldcall for heat and appropriate zone valves close.• Wait 5 minutes.Are FLAME & POWER lights flashing?NoYes• Boiler should now operate normally.• Original flashing FLAME light caused by igniter notoperating properly.• See normal sequence of operation (Figure 75, page 65).• Check and/or replace gas valve.• Recycle boiler by thermostat or service switch. Thermostat shouldcall for heat and appropriate zone valves close.• Wait 5 minutes.Are FLAME & POWER lights flashing?NoYes• Boiler should now operate normally.• Original flashing FLAME light caused by gas valve notoperating properly.• See normal sequence of operation (Figure 75, page 65).• Call your local Weil-McLainsales representative.Part number 550-142-054/1211 85