Boiler Manual - Weil-McLain

GV90+ gas-fired water boiler — Boiler ManualTroubleshooting (continued)Figure 95 Common causes and possible corrections, part 2Symptom Common Causes Possible CorrectionsPopping or percolatingnoise heard in boilerMineral deposits in sections dueto constant use of makeup waterCall qualified service technician to delimeboiler, if necessary. In some cases,deposits will be too heavy to remove withde-liming procedures.Have qualified service technician repairleaks to eliminate need for constantmakeup water.Incorrect pH of boiler waterCall qualified service technician to checkpH level and correct. pH should bemaintained between 7.0 to 8.5.Insufficient water flow throughboilerCheck all valves to and from boiler. Returnto proper setting.Confirm circulator size.Metal flakes found in ventoutlet or recuperator —flueway corrosionContaminated combustion airsupply — See manual page 13.Remove any contaminating products, seemanual page 13.Provide outside air for combustion. Havequalified service technician pipe-up kit.Condensation of combustiongases in boiler sectionsHave qualified service technician checkoperation of mixing system. Repair/replaceif necessary.Some radiators orbaseboard units do notheat or are noisyAir in systemLow system pressureBleed air from system through air vents inradiators or baseboard units.Fill to correct pressure.Check for leaks in boiler or piping. Havequalified service technician repair at once.High limit set too lowAdjust high limit to higher setting.80Part number 550-142-054/1211