Boiler Manual - Weil-McLain

GV90+ gas-fired water boiler — Boiler ManualTroubleshooting (continued)CHART 1Troubleshooting POWER light statusElectrical 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.Flashingalone?NoIs POWER light off?Is POWER light . . .Flashing withanother light?YesOn steady(NOT flashing)?• Make sure service switch or circuit breaker is on or fusesare good.• Remove 120 VAC IN plug (Figure 93, page 78, Item 1) onIBC.• Using voltmeter, check across top and bottom pinsof120 VAC IN receptacle.Does voltmeter indicate 120 VAC?NoYesTSTAT CIRClight flashingCHART 2,page 82Problem is with incomingelectricity. Have licensedelectrician repair circuit.LIMITlight flashingPRESS SWITCHlight flashingFLAMElight flashingNO LIGHT ISFLASHING,but there isinsufficient heatCHART 3,page 83CHART 4,page 84CHART 5,page 85CHART 6,page 86CHART 7,page 87CHART 8,page 88• Usually indicates polarity on incoming 120 VAC powerline is wrong.• TURN OFF POWER at service switch or breaker, thenreverse the HOT and NEUTRAL wires entering the boilerin the J-box.• Restore POWER at service switch or breaker.Is POWER light flashing now?NoYes• Reconnect 120 VAC IN plug.• Remove 120 VAC transformer PRIMARY plug(Figure 93, page 78, Item 2) on IBC.• Using voltmeter, check across top and bottom pins of PRI-MARY receptacle.Does voltmeter indicate 120 VAC?Replace IBC.RetestNoYes• Reinstall 120 VAC transformer PRIMARY plug.• Remove 24 VAC transformer plug (Figure 93, page 78,Item 7) on IBC.• Using voltmeter, check across pins of receptacle.Does voltmeter indicate 24 VAC?NoYesBoiler should now operatenormally.Have system checked by alicensed electrician.If problem persists, call yourlocal Weil-McLain sales representative.Replace transformer.Retest.Replace IBC.Retest.Part number 550-142-054/1211 81