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73Part number 550-141-850/0699
• Installation • Start-Up • Parts • Maintenance
Symptom Common Causes Possible Corrections
Popping or percolating
noise heard in boiler
Mineral deposits in sections due to
constant use of makeup water
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.
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
boiler
Check all valves to and from boiler. Return
to proper setting.
Confirm circulator size.
Metal flakes found in vent
outlet or vent starter tee —
flueway corrosion
Contaminated combustion air
supply — See manual page 13.
Remove any contaminating products, see
manual page 13.
Provide outside air for combustion. Kit
available through Weil-McLain distributor.
Have qualified service technician pipe-up
kit.
Condensation of combustion
gases in boiler sections
Have qualified service technician check
operation of mixing system. Repair/replace
if necessary.
Some radiators or
baseboard units do not
heat or are noisy
Air in system Bleed air from system through air vents in
radiators or baseboard units.
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.