Weil-McLain GV90+ manual Popping or percolating

GV90+ gas-fired water boiler — User’s Information Manual

Common problems and solutions (continued)

Symptom	Common Causes	Possible Corrections
Popping or percolating	Mineral deposits in sections due	Call qualified service technician to de-
noise heard in boiler	to constant use of makeup water	lime boiler, if necessary. In some cases,
		deposits will be too heavy to remove with
		de-liming procedures.
		Have qualified service technician repair
		leaks to eliminate need for constant
		makeup water.
	Incorrect pH of boiler water	Call qualified service technician to check
		pH level and correct. pH should be
		maintained between 7.0 to 8.5.
	Insufficient water flow through	Check all valves to and from boiler. Return
	boiler	to proper setting.
		Confirm circulator size.
Metal flakes found in vent	Contaminated combustion air	Remove any contaminating products. See
outlet or vent starter tee —	supply — See page 4 in this	page 4 in this manual.
flueway corrosion	manual.
		Provide outside air for combustion. Have
		qualified service technician pipe-up kit.
	Condensation of combustion	Have qualified service technician check
	gases in boiler sections	operation of mixing system. Repair/replace
		if necessary.
Some radiators or	Air in system	Bleed air from system through air vents in
baseboard units do not		radiators or baseboard units.
heat or are noisy
	Low system pressure	Fill to correct pressure.
		Check for leaks in boiler or piping. Have
		qualified service technician repair at once.

High limit set too low

Adjust high limit to higher setting.

14 Part number 550-142-055/0411