Weil-McLain WGO manual Common Problems, Common Causes, Corrections

COMMON PROBLEMS	COMMON CAUSES	POSSIBLE	CORRECTIONS
Rapid cycling - burner turns on and off	Thermostat installed where	Locate thermostat	on inner wall away
frequently.	drafts or heat affect reading.	from heat sources	or cool drafts.
	Heat anticipator in	Adjust heat anticipator to match current
	thermostat adjusted	draw. Refer to boiler wiring diagram.
	incorrectly.
	Incorrect limit setting.	Have qualified service technician
		increase limit setting to decrease cycling.
		Maximum setting 220 deg. F.
Need to frequently add makeup water.	Leaks in boiler or piping.	Have qualified service technician repair
		leaks at once to avoid constant use of
		makeup water.
Popping or percolating noise heard in boiler.	Mineral deposits in sections	Have qualified service technician de-lime
	due to constant use of	boiler, repair leaks at once to avoid
	makeup water, or incorrect	constant use of makeup water and check
	pH.	pH (between 7.0 and 8.5).
Black water condition.	Oxygen corrosion due to	Have qualified service technician repair
	leaks in piping.	leaks at once to avoid constant use of
		makeup water and check pH (between
		7.0 and 8.5).
Frequent release of water through relief	Expansion tank sized too	Have qualified service technician check
valve.	small or water-logged.	expansion tank operation.
Metal flakes found in flueway.	Contaminated combustion	Remove sources of hydrocarbons in or
	air supply.	near boiler area. (Bleaches, cleaners,
		chemicals, sprays, fabric softeners, paint
		remover, etc.)
	Condensation of	Have qualified service technician check
	combustion gases.	boiler operation.
Some radiators or baseboard units do not	Air in system.	Bleed air from system through air vents
heat or are noisy.		in radiators or baseboard units.
	Low system pressure.	Have qualified service technician check
		for leaks in boiler or piping at once.
	High limit set too low.	Have qualified service technican adjust
		limit to higher setting.
Domestic water from tankless heater is hot	Mineral deposits insulate	Have qualified service technician delime
then suddenly turns cold.	internal waterways of	or replace coil.
OR	heater.
Domestic water from tankless heater is
	Boiler stop-leak compound	Have qualified service technician remove
always lukewarm.
	has been added to boiler	and clean coil AND drain and flush
	water and is insulating	boiler to remove stop-leak.
	outside of coil.
	Incorrect mixing valve	Have quaified service technican adjust
	setting for tankless heater.	mixing valve setting.
	Domestic flow rate too high.	Have qualified service technician install
		flow check valve set to rating of tankless
		heater.
	Incorrect setting on tankless	Have qualified service technician raise
	heater control.	tankless control setting. Adjust
		differential on tankless control to lower
		setting.

The problems and corrections above represent common situations that can occur. There may be others not listed above. It is important always to contact a qualified service techni- cian if you have any questions about the operation of your boiler or system.

7