Common Problems And Solutions - Weil-McLain CGa User's Information Manual

User's Information Manual

Common problems and solutions

Symptom
Rapid cycling —
boiler turns on and
off frequently
Frequent release of
water through relief
valve
Need to frequently
add makeup water
Black water
condition
Popping or
percolating noise
heard in boiler
Metal flakes found in
vent outlet or vent —
flueway corrosion
Some radiators or
baseboard units do
not heat or are noisy
Part Number 550-110-592/0709
Common Causes
Thermostat installed where drafts
or heat affect reading
Heat anticipator in thermostat
adjusted incorrectly
Incorrect limit setting
Insufficient water flow through
boiler
Expansion tank sized too small
Flooded expansion tank
Inoperative limit control
Leaks in boiler or piping
Oxygen corrosion due to leaks in
boiler and piping
Mineral deposits in sections due
to constant use of makeup water
Incorrect pH of boiler water
Insufficient water flow through
boiler
Contaminated combustion air
supply — See page 3 in this
manual.
Condensation of combustion
gases in boiler sections
Air in system
Low system pressure
High limit set too low
Possible Corrections
Locate thermostat on inner wall away from heat sources or cool
drafts.
Adjust thermostat per manufacturer's instructions.
Set limit according to system needs. Maximum setting is 220˚F.
Increase limit setting to decrease cycling.
Check all valves to and from boiler. Return to proper setting.
Confirm circulator size.
Call qualified service technician to check expansion tank
operation and size.
Call qualified service technician to check expansion tank
operation.
Call qualified service technician to replace limit control.
Have qualified service technician repair leaks at once to avoid
constant use of makeup water. Makeup water can cause
mineral deposits which, in turn, can cause boiler section failure.
Do not use petroleum-base stop-leak compounds.
Have qualified service technician repair at once. Keep pH of
water between 7.0 to 8.5.
Call qualified service technician to de-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.
Call qualified service technician to check pH level and correct.
pH should be maintained between 7.0 to 8.5.
Check all valves to and from boiler. Return to proper setting.
Confirm circulator size.
Remove any contaminating products. See page 3 in this
manual.
Provide outside air for combustion. Kit available through Weil-
McLain distributor. Have qualified service technician pipe-up kit.
Have qualified service technician inspect system piping and
controls to verify proper regulation of return water temperature.
Bleed air from system through air vents in radiators or
baseboard units.
Fill to correct pressure.
Check for leaks in boiler or piping. Have qualified service
technician repair at once.
Adjust high limit to higher setting.
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